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EDLC charging performance for microgrid applications 被引量:9
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作者 徐青山 卞海红 赵伟然 《Journal of Southeast University(English Edition)》 EI CAS 2010年第3期415-420,共6页
In order to review storage performance of the electric double layer capacitor (EDLC) in microgrid applications, charging time and storage efficiency issues are mainly studied aiming at three different charging modes... In order to review storage performance of the electric double layer capacitor (EDLC) in microgrid applications, charging time and storage efficiency issues are mainly studied aiming at three different charging modes, including the constant voltage charging mode (CVCM), the constant current charging mode (CCCM) and the constant power charging mode (CPCM), based on the practical EDLC product. Numerical calculation methods are presented for different charging modes, and the charging efficiency is also reviewed with strict mathematical deductions, which is validated to be accurate enough and applicable through a simple case with the PV/EDLC system illustration. Finally, trade-off problems between charging time and energy loss are also studied. Research results show that the CPCM is more suitable for microgrid networks compared with the traditional constant-voltage and constant-current charging modes. The hybrid charging method is recommended to save energy and keep high efficiency relatively at the same time. However, how to manage the combination percentage of different charging modes in a reasonable way should be dealt with according to the practical requirements. 展开更多
关键词 electric double layer capacitor (EDLC) energy storage charge evaluation numerical calculation trade-off
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Battery Management System with State ofCharge Indicator for Electric Vehicles 被引量:9
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作者 孙逢春 张承宁 郭海涛 《Journal of Beijing Institute of Technology》 EI CAS 1998年第2期166-171,共6页
Aim To research and develop a battery management system(BMS)with the state of charge(SOC)indicator for electric vehicles (EVs).Methods On the basis of analyzing the electro-chemical characteristics of lead-acid. batte... Aim To research and develop a battery management system(BMS)with the state of charge(SOC)indicator for electric vehicles (EVs).Methods On the basis of analyzing the electro-chemical characteristics of lead-acid. battery, the state of charge indicator for lead-acid battery was developed by means of an algorithm based on combination of ampere-hour, Peukert's equation and open-voltage method with the compensation of temperature,aging,self- discharging,etc..Results The BMS based on this method can attain an accurate surplus capa- city whose error is less than 5% in static experiments.It is proved by experiments that the BMS is reliable and can give the driver an accurate surplus capacity,precisely monitor the individual battery modules as the same time,even detect and warn the problems early,and so on. Conclusion A BMS can make the energy of the storage batteries used efficiently, develop the batteries cycle life,and increase the driving distance of EVs. 展开更多
关键词 electric vehicle (EV) the battery management system (BMS) the stage of charge (SOC)indicator lead-acid battery
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基于粗糙集的电力调峰规划智能辅助决策系统 被引量:4
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作者 沙志成 董霜 +1 位作者 李文博 赵彤 《电子设计工程》 2021年第3期127-131,共5页
为解决高压电网调峰充裕性不达标的问题,设计基于粗糙集的电力调峰规划智能辅助决策系统。以智能化辅助平台作为核心决策主机,分别连接电力调峰子电路与电子规划模块,完成辅助决策系统的硬件环境搭建。基于粗糙集理论,计算电量容差值,... 为解决高压电网调峰充裕性不达标的问题,设计基于粗糙集的电力调峰规划智能辅助决策系统。以智能化辅助平台作为核心决策主机,分别连接电力调峰子电路与电子规划模块,完成辅助决策系统的硬件环境搭建。基于粗糙集理论,计算电量容差值,连接调峰处理所需的负荷合同,进而完善辅助决策服务的相关执行环节,完成系统的软件环境搭建,再联合各级硬件、软件结构,完成基于粗糙集的电力调峰规划智能辅助决策系统设计。实验结果表明,与传统辅助决策系统相比,应用新型智能辅助决策系统后,电网高低压降差缩小至120 V,单向电子跳转频率也增大至87%,有效解决了高压电网调峰充裕性不达标的问题。 展开更多
关键词 粗糙集 电力调峰 辅助决策 电量差值 负荷合同 高低压降差
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Influence of heat treatment on electrochemical properties of Ti_(1.4)V_(0.6)Ni alloy electrode containing icosahedral quasicrystalline phase 被引量:1
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作者 刘万强 张姗姗 王立民 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第12期3034-3038,共5页
The structures and electrochemical properties of the Ti1.4V0.6Ni ribbon before and after heat treatment are investigated systematically. The structure of the sample is characterized by X-ray powder diffraction analysi... The structures and electrochemical properties of the Ti1.4V0.6Ni ribbon before and after heat treatment are investigated systematically. The structure of the sample is characterized by X-ray powder diffraction analysis. Electrochemical properties including the discharge capacity, the cyclic stability and the high-rate discharge ability are tested. X-ray powder diffraction analysis shows that after heat treatment at 590 °C for 30 min, all samples mainly consist of the icosahedral quasicrystal phase (I-phase), Ti2Ni phase (FCC), V-based solid solution phase (BCC) and C14 Laves phase (hexagonal). Electrochemical measurements show that the maximum discharge capacity of the alloy electrode after heat treatment is 330.9 mA?h/g under the conditions that the discharge current density is 30 mA/g and the temperature is 30 °C. The result indicates that the cyclic stability and the high-rate discharge ability are all improved. In addition, the electrochemical kinetics of the alloy electrode is also studied by electrochemical impedance spectroscopy (EIS) and hydrogen diffusion coefficient (D). 展开更多
关键词 QUASICRYSTAL Ti1.4V0.6Ni alloy electrochemical properties cyclic stability high-rate discharge discharge capacity
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Electrochemical performances of AB_5-type hydrogen storage alloy modified with Co_3O_4 被引量:3
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作者 张青青 苏耿 +1 位作者 李傲生 刘开宇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第6期1428-1434,共7页
Anodic electrodes with the mixture of hydrogen storage alloys and different contents of Co3O4(2%,4%,6% and 8%,mass fraction) powders were made.The effects of Co3O4 on the electrochemical performance of the alloy ele... Anodic electrodes with the mixture of hydrogen storage alloys and different contents of Co3O4(2%,4%,6% and 8%,mass fraction) powders were made.The effects of Co3O4 on the electrochemical performance of the alloy electrodes were studied.The constant charge-discharge tests show that the discharge capacity of alloy electrodes with Co3O4 significantly increases,and the maximum discharge capacities of electrodes with 2%,4%,6% and 8% Co3O4 are higher than the electrode with no Co3O4 by 0.83%,4.86%,7.18% and 9.21%,accordingly.Linear polarization(LP) and electrochemical impedance spectroscopy(EIS) tests suggest that charge-transfer resistance decreases by the addition of Co3O4.Cyclic voltammogram(CV),scanning electron microscopy(SEM) and energy dispersive spectrum(EDS) tests indicate that Co3O4 can partly dissolve and experience a reversible oxidation-reduction process of Co to Co(OH)2,leading to the improvement in the electrochemical performance of hydrogen storage alloy. 展开更多
关键词 CO3O4 hydrogen storage alloy capacity electrochemical performance
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晋城矿务局办电经验
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作者 曹继生 《中国煤炭》 1996年第2期48-49,共2页
晋城矿务局办电经验晋城矿务局供电处处长曹继生编者按晋城矿务局煤矸石电厂是全局职工集资建设的,设计总装机容量为4.9万kW。1992年一期工程建成投产以来,解决了全局3/4的用电量,上缴利税2000多万元,成为晋局新的... 晋城矿务局办电经验晋城矿务局供电处处长曹继生编者按晋城矿务局煤矸石电厂是全局职工集资建设的,设计总装机容量为4.9万kW。1992年一期工程建成投产以来,解决了全局3/4的用电量,上缴利税2000多万元,成为晋局新的经济增长点。下面的两篇文章,介绍了... 展开更多
关键词 煤矿 发电厂 电网 容电量 电量 经济效益
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Urchin-like Co3O4 Nanostructure and Their Electrochemical Behavior in Rechargeable Lithium Ion Battery 被引量:1
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作者 李惠 费广涛 +3 位作者 崔平 金翼 冯旭勇 陈春华 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2011年第3期343-347,I0004,共6页
3D urchin-like Co3O4 have been successfully prepared by calcination of the urchin-like precursors, which were synthesized through a facile hydrothermal route. The morphology and structure of the 3D urchin-like Co3O4 h... 3D urchin-like Co3O4 have been successfully prepared by calcination of the urchin-like precursors, which were synthesized through a facile hydrothermal route. The morphology and structure of the 3D urchin-like Co3O4 have been characterized by field emission scanning electron microscopy, transmission electron microscopy, high resolution transmission electron microscopy, and X-ray powder diffraction. The as-synthesized Co3O4 products are of urchin-like structures with approximated 5-7 μm in diameter, and are composed of numerous nanoparticles chains with the particles diameter of about 15 nm. This kind of urchin-like Co3O4 exhibits superior energy storage properties with the high capacity of 1.369 Ah/g and its good cyclic stability shows great potential in the rechargeable Li-ion battery. 展开更多
关键词 CO3O4 Urchin-like structure HYDROTHERMAL Lithium ion battery Discharge capacity
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A Temperature-Autocompensated Detecting Circuit for the Capacitance Fuze
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作者 邓甲昊 周勇 +2 位作者 程受浩 刘华 施聚生 《Journal of Beijing Institute of Technology》 EI CAS 1993年第1期74-82,共9页
In view of drastic possible changes in fuze environment tempera- ture,a kind of temperature autocompensated detecting circuit for the capaci- tance fuze is proposed.It provides a steady detected output when the envi- ... In view of drastic possible changes in fuze environment tempera- ture,a kind of temperature autocompensated detecting circuit for the capaci- tance fuze is proposed.It provides a steady detected output when the envi- ronment temperature varies from-50℃ to 65℃ and keeps a stable detecting sensitivity.Based on an analysis of the circuit,influence of the major param- eters of the oscillating circuit on the amplitude are explored.A few impor- tant controllable parameters affecting the circuit feature are found out.A parameter-control method is given in order to improve the circuit perfor- mance. 展开更多
关键词 capacitance fuze detecting circuit circuit analysis/parameter analysis
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Electrochemical hydrogen storage performance of as-cast and as-spun RE-Mg-Ni-Co-Al-based alloys applied to Ni/MH battery 被引量:5
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作者 Yang-huan ZHANG Ya-qin LI +3 位作者 Hong-wei SHANG Zhong-hui HOU Yan QI Dong-liang ZHAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第4期711-721,共11页
The La-Mg-Ni-Co-Al-based AB2-type La0.8-xCe0.2YxMgNi3.4Co0.4Al0.1(x=0,0.05,0.1,0.15,0.2)alloys were prepared via melt spinning.The analyses of the X-ray diffraction(XRD)and scanning electron microscopy(SEM)proved that... The La-Mg-Ni-Co-Al-based AB2-type La0.8-xCe0.2YxMgNi3.4Co0.4Al0.1(x=0,0.05,0.1,0.15,0.2)alloys were prepared via melt spinning.The analyses of the X-ray diffraction(XRD)and scanning electron microscopy(SEM)proved that the experimental alloys contain the main phase LaMgNi4 and the second phase LaNi5.Increasing Y content and spinning rate lead to grain refinement and obvious change of the phase abundance without changing phase composition.Y substitution for La and melt spinning make the life-span of the alloys improved remarkably,which is attributed to the improvement of anti-oxidation,anti-pulverization and anti-corrosion abilities.In addition,the discharge capacity visibly decreases with increasing the Y content,while it firstly increases and then decreases with increasing spinning rate.The electrochemical kinetics increases to the optimum performance and then reduces with increasing spinning rate.Moreover,all the alloys achieve to the highest discharge capacities just at the initial cycle without activation. 展开更多
关键词 Y La substitution spinning rate life-span discharge capacity electrochemical kinetics
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Effects of spinning rate on structures and electrochemical hydrogen storage performances of RE-Mg-Ni-Mn-based AB_2-type alloys 被引量:6
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作者 Yang-huan ZHANG Wei ZHANG +3 位作者 Xi-ping SONG Pei-long ZHANG Yong-guo ZHU Yan QI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第12期3219-3231,共13页
La was partially substituted by Ce with the aim of improving the electrochemical hydrogen storage performances ofLa1–xCexMgNi3.5Mn0.5 (x=0, 0.1, 0.2, 0.3, 0.4) alloys, and melt spinning technology was adopted to fabr... La was partially substituted by Ce with the aim of improving the electrochemical hydrogen storage performances ofLa1–xCexMgNi3.5Mn0.5 (x=0, 0.1, 0.2, 0.3, 0.4) alloys, and melt spinning technology was adopted to fabricate the alloys. Theidentification of XRD and SEM reveals that the experimental alloys consist of a major phase LaMgNi4 and a secondary phase LaNi5.The growth of spinning rate results in that the lattice constants and cell volume increase and the grains are markedly refined. Theelectrochemical measurement shows that the as-cast and spun alloys can obtain the maximum discharge capacities just at the firstcycle without any activation needed. With the increase of spinning rate, the discharge capacities of the alloys first increase and thendecline, whereas their cycle stabilities always grow. Moreover, the electrochemical kinetic performances of the alloys first increaseand then decrease with spinning rate growing. 展开更多
关键词 Ni.MH battery hydrogen storage melt spinning discharge capacity KINETICS
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Influence of synthesis temperature on electrochemical performance of polyoxomolybdate as cathode material of lithium ion battery 被引量:1
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作者 李文良 倪尔福 +1 位作者 李新海 郭华军 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第10期2687-2692,共6页
In order to improve the electrochemical performance of polyoxomolybdate Na3[AlMo6O24H6](NAM) as the cathode material of lithium ion battery, the NAM materials with small particle size were synthesized by elevatingth... In order to improve the electrochemical performance of polyoxomolybdate Na3[AlMo6O24H6](NAM) as the cathode material of lithium ion battery, the NAM materials with small particle size were synthesized by elevatingthe synthesistemperaturein the solution.The as-prepared NAM materials were investigated by FT-IR, XRD, SEM and EIS. Their discharge-charge and cycle performance were also tested. The resultsshowthat the particle size decreasesto less than10μm at the temperature ofhigher than 40℃.When synthesized at 80℃,the NAMwiththe smallest particle size (-3μm)exhibitsthe best electrochemical performance such ashigh initial discharge capacity of 409 mA·h/gandcoulombic efficiency of 95% in the first cycle at 0.04C. 展开更多
关键词 POLYOXOMOLYBDATE lithium ion battery cathode material high capacity
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Hydrogen storage behavior of nanocrystalline and amorphous La-Mg-Ni-based LaMg_(12)-type alloys synthesized by mechanical milling 被引量:5
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作者 Yang-huan ZHANG Long-wen LI +3 位作者 Dian-chen FENG Peng-fei GONG Hong-wei SHANG Shi-hai GUO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第3期551-561,共11页
Nanocrystalline and amorphous LaMg11Ni+x%Ni(x=100,200,mass fraction)alloys were synthesized by mechanicalmilling.The electrochemical hydrogen storage properties of the as-milled alloys were tested by an automatic galv... Nanocrystalline and amorphous LaMg11Ni+x%Ni(x=100,200,mass fraction)alloys were synthesized by mechanicalmilling.The electrochemical hydrogen storage properties of the as-milled alloys were tested by an automatic galvanostatic system.The gaseous hydrogen absorption and desorption properties were investigated by Sievert’s apparatus and differential scanningcalorimeter(DSC)connected with a H2detector.The results indicated that increasing Ni content significantly improves the gaseousand electrochemical hydrogen storage performances of the as-milled alloys.The gaseous hydrogen absorption capacities andabsorption rates of the as-milled alloys have the maximum values with the variation of the milling time.But the hydrogen desorptionkinetics of the alloys always increases with the extending of milling time.In addition,the electrochemical discharge capacity andhigh rate discharge(HRD)ability of the as-milled alloys both increase first and then decrease with milling time prolonging. 展开更多
关键词 Ni-MH battery hydrogen storage alloy mechanical milling discharge capacity KINETICS
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Preparation and characterization of spinel LiMn_2O_4 nanorods as lithium-ion battery cathodes 被引量:5
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作者 陈泽华 黄可龙 +1 位作者 刘素琴 王海燕 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第12期2309-2313,共5页
The hydrothermal synthesis of single-crystallineβ-MnO2 nanorods and their chemical conversion into single-crystalline LiMn2O4 nanorods by a simple solid-state reaction were reported.This method has the advantages of ... The hydrothermal synthesis of single-crystallineβ-MnO2 nanorods and their chemical conversion into single-crystalline LiMn2O4 nanorods by a simple solid-state reaction were reported.This method has the advantages of producing pure,single-phase and crystalline nanorods.The LiMn2O4 nanorods have an diameter of about 300 nm.The discharge capacity and cyclic performance of the batteries were investigated.The LiMn2O4 nanorods show better cyclic performance with a capacity retention ratio of 86.2% after 100 cycles.Battery cyclic studies reveal that the prepared LiMn2O4 nanorods have high capacity with a first discharge capacity of 128.7 mA·h/g. 展开更多
关键词 spinel LiMn2O4 nanorods β-MnO2 nanorods hydrothermal synthesis solid-state reaction electro-chemical properties
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Mechanism for capacity fading of 18650 cylindrical lithium ion batteries 被引量:4
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作者 Jian-liang CHENG Xin-hai LI +1 位作者 Zhi-xing WANG Hua-jun GUO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第7期1602-1607,共6页
The mechanism for capacity fading of18650lithium ion full cells under room-temperature(RT)is discussedsystematically.The capacity loss of18650cells is about12.91%after500cycles.The cells after cycles are analyzed by X... The mechanism for capacity fading of18650lithium ion full cells under room-temperature(RT)is discussedsystematically.The capacity loss of18650cells is about12.91%after500cycles.The cells after cycles are analyzed by XRD,SEM,EIS and CV.Impedance measurement shows an overall increase in the cell resistance upon cycling.Moreover,it also presents anincreased charge-transfer resistance(Rct)for the cell cycled at RT.CV test shows that the reversibility of lithium ioninsertion/extraction reaction is reduced.The capacity fading for the cells cycled can be explained by taking into account the repeatedfilm formation over the surface of anode and the side reactions.The products of side reactions deposited on separator are able toreduce the porosity of separator.As a result,the migration resistance of lithium ion between the cathode and anode would beincreased,leading the fading of capacity and potential. 展开更多
关键词 18650 lithium ion battery capacity fading cycle performance
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Comparison of capacitive behavior of activated carbons with different pore structures in aqueous and nonaqueous systems 被引量:2
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作者 周邵云 李新海 +2 位作者 王志兴 郭华军 彭文杰 《Journal of Central South University of Technology》 EI 2008年第5期674-678,共5页
The pore structures of two activated carbons from sawdust with KOH activation and coconut-shell with steam activation for supercapacitor were analyzed by N2 adsorption method. The electrochemical properties of both ac... The pore structures of two activated carbons from sawdust with KOH activation and coconut-shell with steam activation for supercapacitor were analyzed by N2 adsorption method. The electrochemical properties of both activated carbons in 6 mol/L KOH solution and 1 mol/L EtgNPF4/PC were compared, and the effect of pore structure on the capacitance was investigated by cyclic voltammetry, AC impedance and charge-discharge measurements. The results indicate that the capacitance mainly depends on effective surface area, but the power property mainly depends on mesoporosity. At low specific current (1 A/g), the maximum specific Capacitances of 276.3 F/g in aqueous system and 123.9 F/g in nonaqueous system can be obtained from sawdust activated carbon with a larger surface area of 1 808 m^2/g, butat a high specific current, the specific capacitance of coconut-shell activated carbon with a higher mesoporosity of 75.1% is more excellent. Activated carbon by KOH activation is fitter for aqueous system and that by steam activation is fitter for nonaqueous system. 展开更多
关键词 activated carbon SUPERCAPACITOR aqueous system nonaqueous system CAPACITANCE
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A new state of charge determination method for battery management system 被引量:4
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作者 朱春波 王铁成 HURLEY W G 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第6期624-630,共7页
State of Charge (SOC) determination is an increasingly important issue in battery technology. In addition to the immediate display of the remaining battery capacity to the user, precise knowledge of SOC exerts additio... State of Charge (SOC) determination is an increasingly important issue in battery technology. In addition to the immediate display of the remaining battery capacity to the user, precise knowledge of SOC exerts additional control over the charging/discharging process which in turn reduces the risk of over-voltage and gassing, which degrade the chemical composition of the electrolyte and plates. This paper describes a new approach to SOC determination for the lead-acid battery management system by combining Ah-balance with an EMF estimation algorithm, which predicts the battery’s EMF value while it is under load. The EMF estimation algorithm is based on an equivalent-circuit representation of the battery, with the parameters determined from a pulse test performed on the battery and a curve-fitting algorithm by means of least-square regression. The whole battery cycle is classified into seven states where the SOC is estimated with the Ah-balance method and the proposed EMF based algorithm. Laboratory tests and results are described in detail in the paper. 展开更多
关键词 state of charge BATTERY battery management system
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Effect of Zn/Mg ratio on cathodic protection of carbon steel using Al-Zn-Mg sacrificial anodes 被引量:8
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作者 Mosaad SADAWY Saad SAAD Randa ABDEL-KARIM 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第8期2067-2078,共12页
Al-Zn-Mg alloys with different Zn/Mg mass ratios were evaluated as sacrificial anodes for cathodic protection of carbon steel in 3.5 wt.%Na Cl solution.The anodes were fabricated from pure Al,Zn and Mg metals using ca... Al-Zn-Mg alloys with different Zn/Mg mass ratios were evaluated as sacrificial anodes for cathodic protection of carbon steel in 3.5 wt.%Na Cl solution.The anodes were fabricated from pure Al,Zn and Mg metals using casting technique.Optical microscopy,SEM-EDS,XRD and electrochemical techniques were used.The results indicated that with decreasing Zn/Mg mass ratio,the grain size ofα(Al)and the particle size of the precipitates decreased while the volume fraction of the precipitates increased.The anode with Zn/Mg mass ratio>4.0 exhibited the lowest corrosion rate,while the anode with Zn/Mg mass ratio<0.62 gave the highest corrosion rate and provided the highest cathodic protection efficiency for carbon steel(AISI 1018).Furthermore,the results showed that the anode with Zn/Mg mass ratio<0.62 exhibited a porous corrosion product compared to the other anodes. 展开更多
关键词 cathodic protection Al-Zn-Mg sacrificial anode current capacity passive film PRECIPITATE grain size
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Preparation and Electrochemical Performances of Nickel Metal Hydride Batteries with High Specific Volume Capacity 被引量:4
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作者 杨敏杰 南俊民 +1 位作者 侯宪鲁 李伟善 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第6期944-948,共5页
Cylindrical nickel metal hydride (Ni-MH) battery with high specific volume capacity was prepared by using the oxyhydroxide Ni(OH)2 and AB5 type hydrogen storage alloy and adjusting the designing parameters of posi... Cylindrical nickel metal hydride (Ni-MH) battery with high specific volume capacity was prepared by using the oxyhydroxide Ni(OH)2 and AB5 type hydrogen storage alloy and adjusting the designing parameters of positive and negative electrodes. The oxyhydroxide Ni(OH)2 was synthesized by oxidizing spherical β-Ni(OH)2 with chemical method. The X-ray diffraction (XRD) patterns and the Fourier transform infrared (PT-IR) spectra indicated that 7-NiOOH was formed on the oxyhydroxide Ni(OH)2 powders, and some H2O molecules were inserted into their crystal lattice spacing. The battery capacity could not be improved when the oxyhydroxide Ni(OH)2 sample was directly used as the positive active materials. However, based on the conductance and residual capacity of the oxyhydroxide Ni(OH)2 powders, AA size Ni-MH battery with 2560 mA.h capacity and 407 W·h·L^-1 specific volume energy at 0.2C was obtained by using the commercial spherical β-Ni(OH)2 and AB5-type hydrogen-storage alloy powders as the active materials when 10% mass amount of the oxyhydroxide Ni(OH)2 with 2.50 valence was added to the positive active materials and subsequently the battery designing parameters were adjusted as well. The as-prepared battery showed 70% initial capacity after 80 cycles at 0.5C. The possibility for adjusting the capacity ratio of positive and negative electrodes from 1 : 1.35 to 1 : 1.22 was demonstrated preliminarily. It is considered the as-prepared battery can meet the requirement of some special portable electrical instruments. 展开更多
关键词 oxyhydroxide Ni(OH)2 nickel metal hydride battery high capacity PREPARATION electrochemical performance
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Experimental study on heat generation and dissipation performance of PEV Lithium-ion battery 被引量:3
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作者 孙逢春 Chen Ke Lin Cheng Wang Zhenpo 《High Technology Letters》 EI CAS 2010年第1期1-5,共5页
Based on the lithium-ion battery pure electric vehicle (PEV) application, two capacity types of batteries are applied in thermal characteristic experiments. With the experimental comparison method, battery thermal c... Based on the lithium-ion battery pure electric vehicle (PEV) application, two capacity types of batteries are applied in thermal characteristic experiments. With the experimental comparison method, battery thermal characteristics and heat generation mechanism are studied. Experiments of batteries in cases of different dimensions, batteries with different air cooling velocity and two capacity types of batteries in free convection environment are put forward. Battery heat generation performance, heat dissipation performance and comparison of different capacity types' batteries are researched and summarized. Conclusions of battery heat generation and dissipation in PEV applications, important battery thermal management factors and suggestions are put forward. 展开更多
关键词 pure electric vehicle (PEV) lithium-ion battery heat generation heat dissipation
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Structure and electrochemical hydrogen storage characteristics of La_(0.8-x)Pr_xMg_(0.2)Ni_(3.15)Co_(0.2)Al_(0.1)Si_(0.05) (x=0-0.4) electrode alloys 被引量:3
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作者 张羊换 侯忠辉 +3 位作者 杨泰 张国芳 李霞 赵栋梁 《Journal of Central South University》 SCIE EI CAS 2013年第5期1142-1150,共9页
For the purpose of improving the electrochemical cycle stability of the La-Mg-Ni based A2BT-type electrode alloys, both reducing Mg content and substituting La with Pr were adopted. The Lao.8-xPrxMg0.2Ni3.15Co0.2A10.1... For the purpose of improving the electrochemical cycle stability of the La-Mg-Ni based A2BT-type electrode alloys, both reducing Mg content and substituting La with Pr were adopted. The Lao.8-xPrxMg0.2Ni3.15Co0.2A10.1Si0.05 (x=0, 0.1, 0.2, 0.3, 0.4) electrode alloys were fabricated by casting and annealing. The investigation on the structures and electrochemical performances of the alloys was performed. The obtained results reveal that the as-cast and annealed alloys comprise two major phases, (La, Mg)2Ni7 phase with the hexagonal Ce2NiT-type structure and LaNi5 phase with the hexagonal CaCus-type structure, as well as a little residual LaNi3 phase. It is also found that the addition of Pr element observably affects the electrochemical hydrogen storage characteristics of the alloys, just as the discharge capacity and high rate discharge ability (HRD) first rise then fall with the growing of Pr content, and among all the alloys, the as-cast and annealed (x=0.3) alloys generate the largest discharge capacities of 360.8 and 386.5 mA.h/g, respectively. Additionally, the electrochemical cycle stability of all the alloys markedly grows with the increase of Pr content. The capacity retaining rate (S100) at the 100th charging and discharging cycle is enhanced from 64.98% to 77.55% for the as-cast alloy, and from 76.60% to 95.72% for the as-annealed alloy by rising Pr content from 0 to 0.4. Furthermore, the substitution of Pr for La results in first increase and then decrease in the hydrogen diffusion coefficient (D), the limiting current density (IL) as well as the electrochemical impedance. 展开更多
关键词 A2B7-type electrode alloy LA PR STRUCTURE electrochemical performances
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