期刊文献+
共找到420篇文章
< 1 2 21 >
每页显示 20 50 100
Design of multifunctional polymeric binders in silicon anodes for lithium‐ion batteries 被引量:2
1
作者 Masytha Nuzula Ramdhiny Ju‐Won Jeon 《Carbon Energy》 SCIE EI CAS CSCD 2024年第4期140-163,共24页
Silicon(Si)is a promising anode material for lithium‐ion batteries(LIBs)owing to its tremendously high theoretical storage capacity(4200 mAh g−1),which has the potential to elevate the energy of LIBs.However,Si anode... Silicon(Si)is a promising anode material for lithium‐ion batteries(LIBs)owing to its tremendously high theoretical storage capacity(4200 mAh g−1),which has the potential to elevate the energy of LIBs.However,Si anodes exhibit severe volume change during lithiation/delithiation processes,resulting in anode pulverization and delamination with detrimental growth of solid electrolyte interface layers.As a result,the cycling stability of Si anodes is insufficient for commercialization in LIBs.Polymeric binders can play critical roles in Si anodes by affecting their cycling stability,although they occupy a small portion of the electrodes.This review introduces crucial factors influencing polymeric binders'properties and the electrochemical performance of Si anodes.In particular,we emphasize the structure–property relationships of binders in the context of molecular design strategy,functional groups,types of interactions,and functionalities of binders.Furthermore,binders with additional functionalities,such as electrical conductivity and self‐healability,are extensively discussed,with an emphasis on the binder design principle. 展开更多
关键词 CONDUCTIVITY lithium‐ion batteries molecular interactions polymeric binders self‐healability si anodes
下载PDF
Effect of Corrosive Ions (Cl^-,SO4^2-,and Mg^2+) on the Nanostructure and Chloride Binding Property of C-A-S-H Gel 被引量:1
2
作者 JIN Shucheng LIU Kai +3 位作者 ZHANG Gaozhan SHI Hua DING Qingjun XU Wenyuan 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2020年第6期1061-1072,共12页
The nanostructure and chloride binding capacity evolution of C-A-S-H gel exposed to aggressive solutions were investigated,utilizing 29Si NMR,27Al NMR,SEM-EDS,and XRD techniques.The experimental results show that whil... The nanostructure and chloride binding capacity evolution of C-A-S-H gel exposed to aggressive solutions were investigated,utilizing 29Si NMR,27Al NMR,SEM-EDS,and XRD techniques.The experimental results show that while Cl-ions show a smaller effect on the microstructure of C-A-S-H sample,and SO4^2-ions can react with C-A-S-H,resulting in decreasing Ca/Si and Al[4]/Si for the C-A-S-H gel (i e,decalcification and dealuminization).The presence of Mg^2+ ions can aggravate the decalcifying and dealuminizing effects of SO4^2-ions on the C-A-S-H.With decreasing Ca/Si ratio and aluminum substitution for the original C-A-S-H gel,the depolymerization degree of silicate tetrahedra increases and the calcium aluminosilicate skeleton strengthens.C-A-S-H gel with lower Ca/Si ratio and higher Al[4]/Si ratio shows gentler nanostructure evolution under chemical attack,i e,improving thermodynamic stability under chemical attack.Furthermore,the chloride binding capacity of C-A-S-H gel is decreased after the sulfate attack.Aluminum substitution can also help C-A-S-H gel resist the degraded chloride binding capacity induced by sulfate attack. 展开更多
关键词 calcium-silicate-hydrate ions attack Ca/si ratio /si aluminum uptake
下载PDF
Photoluminescence and Optical Transition Dynamics of Er^(3+) Ions in Porous Si 被引量:1
3
作者 Xinwei ZHAO Hideo Isshiki Yoshinobu Aoyagi and Takuo Sugano(Frontier Research Program, The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan)Shuji Komuro(Faculty of Engineering. Toyo University, Kawagoe, Sa 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1999年第4期357-362,共6页
Er was doped into porous Si by immersing the porous Si sample in a saturated ErCl3,ethanol solution. Sharp and intense 1.54 μm photoluminescence caused by intra-4f-shefl transitions in Er3+ ions was observed up to ro... Er was doped into porous Si by immersing the porous Si sample in a saturated ErCl3,ethanol solution. Sharp and intense 1.54 μm photoluminescence caused by intra-4f-shefl transitions in Er3+ ions was observed up to room temperature. It is shown that the immersing process is valid to dope Er in high concentration in porous Si. Time resolved study of the Er-doped porous Si revealed that the doped Er3+ ions are excited by energy transfer from photo-generated electron-hole pairs in the host. The energy back transfer process from the excited 4f electrons in the Er3+ion to the host is not a dominant factor to quench the Er-related emission in porous Si. Ourresults are well explained by a proposed model in which an intermediate state was introduced. 展开更多
关键词 OO Photoluminescence and Optical Transition Dynamics of Er ions in Porous si FIGURE OK
下载PDF
COMPETING REACTIONS OF EXISTING Ni SILICIDE AND Ni OR Si INDUCED BY THERMAL ANNEALING AND MeV Si ION BEAM MIXING
4
作者 朱德彰 M.C.Ridgway +2 位作者 R.G.Elliman J.S.Williams G.Collins 《Nuclear Science and Techniques》 SCIE CAS CSCD 1993年第3期158-163,共6页
The competing reactions between existing Ni silicides surrounded by Si and Ni were investigated by thermal annealing and MeV Si ion beam mixing. With high energy irradiation, the energy deposition at both interfaces, ... The competing reactions between existing Ni silicides surrounded by Si and Ni were investigated by thermal annealing and MeV Si ion beam mixing. With high energy irradiation, the energy deposition at both interfaces, Ni/Ni silicide and Ni silicide/Si, is equal. Two MeV He^- RBS and TEM were used to obtain the reacted layer composition and epitaxial orientation, respectively. Also glancing angle Co K_a. X-ray diffraction was utilized to identify phase formation. The main results indicate that the existing silicides preferentially react with Ni layer, and that there are pronounced differences of Ni silicide phase transition between thermal annealing and MeV Si ion beam mixing, even though the mixing was performed in radiation enhanced diffusion regime. The results can be explained in term of the heat of silicide formation and surface energy change. 展开更多
关键词 Chemical reaction kinetics NI siLICIDES MEV si ion beam mixing ANNEALING RBS TEM
下载PDF
Viscoelastic Properties and Bioactivity of Sol-Gel Derived Gelatin-Silicate Composites: Effects of the Incorporated Ca^(2+) Ions
5
作者 L.Ren, K.Tsuru, S.Hayakawa and A.Osaka Biomaterial Laboratory, Faculty of Engineering, Okayama University, Tsushima 3-1-1, Okayama-shi 700-8530, Japan E-mail: osaka@cc.okayama-u.ac.jp 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第3期367-370,共4页
Several gelatin-silicate composites, with or without incorporation of Ca2+ ions, were synthesized through sol-gel processing starting from gelatin and 3- (glycidoxypropyl) trimethoxysilane. The structure around the Si... Several gelatin-silicate composites, with or without incorporation of Ca2+ ions, were synthesized through sol-gel processing starting from gelatin and 3- (glycidoxypropyl) trimethoxysilane. The structure around the Si atoms was similar for all the samples. The measurement of viscoelastic properties indicated that the glass transition temperature and activation energy decreased with the incorporation of Ca2+ ions. The Ca2+ ion-containing composites were bioactive as they spontaneously deposited apatite when soaked in a simulated body fluid of the Kokubo recipe. 展开更多
关键词 si ions Viscoelastic Properties and Bioactivity of Sol-Gel Derived Gelatin-silicate Composites Effects of the Incorporated Ca
下载PDF
GAS-PHASE ION-MOLECULE REACTIONS OF BUCKMINSTERFULLERENE(C_(60))WITH Si(CH_3)_n CL_(4-n)(n=2,3)IN MASS SPECTROMETER
6
作者 Xing Hua GUO Zi Yang LIU Shu Ying LIU Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun,130022 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第9期797-800,共4页
Reactions of C60 with Si(CH_3)_nCl_(4-n) (n=2,3)in the ion source of the mass spectrometer have been studied.The corresponding adduct ions[C60Si(CH_3)_mCl3_(-m)]^+(m=1,2,3),[C60SiCl]^+ and[C60CH_3]^+ were observed and... Reactions of C60 with Si(CH_3)_nCl_(4-n) (n=2,3)in the ion source of the mass spectrometer have been studied.The corresponding adduct ions[C60Si(CH_3)_mCl3_(-m)]^+(m=1,2,3),[C60SiCl]^+ and[C60CH_3]^+ were observed and their possible structures were discussed.The results indicated that C60 is very reactive to electrophiles in the gas phase. 展开更多
关键词 n=2 3)IN MASS SPECTROMETER WITH si CH3 n CL N ion CL GAS-PHASE ion-MOLECULE REACTions OF BUCKMINSTERFULLERENE siCI
下载PDF
3-2 A Study on Nano-indentation of 4H-SiC Irradiated by He and Si Ions
7
作者 Han Yi Li Bingsheng +1 位作者 Wang Zhiguang Peng Jinxin 《IMP & HIRFL Annual Report》 2015年第1期91-92,共2页
Part of single crystal 4H-SiC wafers were implanted with 230 keV He+ ion at room temperature (RT) with fluences in the range 1.0  1015 2.0  1016 (0.040.8 dpa). The last single crystal 4H-SiC were implanted with 23... Part of single crystal 4H-SiC wafers were implanted with 230 keV He+ ion at room temperature (RT) with fluences in the range 1.0  1015 2.0  1016 (0.040.8 dpa). The last single crystal 4H-SiC were implanted with 230 keV Si5+ ion at RT with fluences in the range 1.0  1015 1.0  1017 (0.044.0 dpa). Hardness versus maximum penetration depth curves for unimplanted 4H-SiC, and He/Si ion implanted 4H-SiC at different fluences. Nanoindentation was performed to investigate the hardening behavior of single crystals 4H-SiC under irradiation. 展开更多
关键词 HE si ions
下载PDF
Silicon/flake graphite/carbon anode materials prepared with different dispersants by spray-drying method for lithium ion batteries 被引量:3
8
作者 赖浚 郭华军 +5 位作者 李向群 王志兴 李新海 张晓萍 黄思林 甘雷 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第5期1413-1420,共8页
Silicon/flake graphite/carbon (Si/FG/C) composites were synthesized with different dispersants via spray drying and subsequent pyrolysis, and effects of dispersants on the characteristics of the composites were inve... Silicon/flake graphite/carbon (Si/FG/C) composites were synthesized with different dispersants via spray drying and subsequent pyrolysis, and effects of dispersants on the characteristics of the composites were investigated. The structure and properties of the composites were determined by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and electrochemical measurements. The results show that samples have silicon/flake graphite/amorphous carbon composite structure, good spherical appearances, and better electrochemical performance than pure nano-Si and FG/C composites. Compared with the Si/FG/C composite using washing powder as dispersant, the Si/FG/C composite using sodium dodecyl benzene sulfonate (SDBS) as dispersant has better electrochemical performance with a reversible capacity of 602.68 mA·h/g, and a capacity retention ratio of 91.58 % after 20 cycles. 展开更多
关键词 lithium ion battery si/C composite spray drying ANODE
下载PDF
原位合成Si/(SiO+Ag)复合负极材料及其电化学性能
9
作者 王帅 唐梦 +3 位作者 蔡振飞 曹瑞 马扬洲 宋广生 《精细化工》 EI CAS CSCD 北大核心 2024年第1期107-113,共7页
将微米Si和纳米Ag_(2)O进行机械球磨,通过原位固相反应合成了Si基复合材料[Si/(SiO+Ag)],以沥青为碳源采用高温煅烧法制备了碳包覆Si基复合材料[Si/(SiO+Ag)-C]。采用XRD、XPS、SEM、TEM对复合材料进行了表征,测试了其电化学性能。结果... 将微米Si和纳米Ag_(2)O进行机械球磨,通过原位固相反应合成了Si基复合材料[Si/(SiO+Ag)],以沥青为碳源采用高温煅烧法制备了碳包覆Si基复合材料[Si/(SiO+Ag)-C]。采用XRD、XPS、SEM、TEM对复合材料进行了表征,测试了其电化学性能。结果表明,微米Si和纳米Ag_(2)O在球磨破碎过程中原位形成Si O和Ag颗粒,并附着在基体Si上,两种复合材料都展现出良好的倍率性能,在低电流密度(0.12 A/g)下Si/(SiO+Ag)和Si/(SiO+Ag)-C循环5次后分别表现出1422和1039 mA·h/g的可逆比容量,而在高电流密度(2.40 A/g)下仍能获得672和393 mA·h/g的可逆比容量;当电流密度再次恢复到0.12 A/g时,可逆比容量可恢复到1329和961m A·h/g,Si/(SiO+Ag)-C表现出更好的循环稳定性,经80次循环后可逆比容量仍稳定在943 m A·h/g,其突出的倍率性能归因于微米Si的颗粒细化以及球磨过程中原位反应形成纳米Ag颗粒导电特性,而循环稳定性的提高与原位形成Si O和包覆碳构成的双相缓冲结构有关。 展开更多
关键词 锂离子电池 复合材料 si负极材料 固相反应 机械化学 功能材料
下载PDF
Effects of Si Ion Implantation on the Total-Dose Radiation Properties of SIMOX SOI Materials
10
作者 杨慧 张恩霞 张正选 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2007年第3期323-326,共4页
To improve the total-dose radiation hardness,silicon-on-insulator (SOI) wafers fabricated by the separation-by-implanted-oxygen (SIMOX) method are modified by Si ion implantation into the buried oxide with a post ... To improve the total-dose radiation hardness,silicon-on-insulator (SOI) wafers fabricated by the separation-by-implanted-oxygen (SIMOX) method are modified by Si ion implantation into the buried oxide with a post anneal. The ID- VG characteristics can be tested with the pseudo-MOSFET method before and after radiation. The results show that a proper Si-ion-implantation method can enhance the total-dose radiation tolerance of the materials. 展开更多
关键词 siMOX SOI si ion implantation total-dose radiation effect pseudo-MOS
下载PDF
Research on the radiation hardened SOI devices with single-step Si ion implantation 被引量:2
11
作者 Li-Hua Dai Da-Wei Bi +4 位作者 Zhi-Yuan Hu Xiao-Nian Liu Meng-Ying Zhang Zheng-Xuan Zhang Shi-Chang Zou 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第4期536-542,共7页
Silicon-on-insulator(SOI) devices are sensitive to the total ionizing dose effect due to the existence of buried oxide.In this paper,an extra single-step Si ion implantation into buried oxide layer prior to the norm... Silicon-on-insulator(SOI) devices are sensitive to the total ionizing dose effect due to the existence of buried oxide.In this paper,an extra single-step Si ion implantation into buried oxide layer prior to the normal complementary metal–oxide–semiconductor transistor(CMOS) process is used to harden the SOI wafer.The top-Si quality of the hardened SOI wafer is confirmed to be good enough for device manufacturing through various characterization methods.The radiation experiments show that the total ionizing dose tolerance of the Si implanted SOI device is improved significantly.The metastable electron traps introduced by Si implantation is also investigated by electrical stress.The results show that these traps are very instable,and electrons will tunnel into or out of the metastable electron traps quickly after hot-electroninjection or hot-hole-injection. 展开更多
关键词 siLICON-ON-INSULATOR total ionizing dose si ion implantation metastable electron traps
下载PDF
Interfacial nitrogen engineering of robust silicon/MXene anode toward high energy solid-state lithium-ion batteries 被引量:6
12
作者 Xiang Han Weijun Zhou +8 位作者 Minfeng Chen Jizhang Chen Guanwen Wang Bo Liu Linshan Luo Songyan Chen Qiaobao Zhang Siqi Shi Ching-Ping Wong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第4期727-735,共9页
Replacing the conventional carbonate electrolyte by solid-state electrolyte (SSE) will offer improved safety for lithium-ion batteries.To further improve the energy density,Silicon (Si) is attractive for next generati... Replacing the conventional carbonate electrolyte by solid-state electrolyte (SSE) will offer improved safety for lithium-ion batteries.To further improve the energy density,Silicon (Si) is attractive for next generation solid-state battery (SSB) because of its high specific capacity and low cost.High energy density and safe Si-based SSB,however,is plagued by large volume change that leads to poor mechanical stability and slow lithium ions transportation at the multiple interfaces between Si and SSE.Herein,we designed a self-integrated and monolithic Si/two dimensional layered T_(3)C_(2)T_(x)(MXene,T_(x) stands for terminal functional groups) electrode architecture with interfacial nitrogen engineering.During a heat treatment process,the polyacrylonitrile not only converts into amorphous carbon (a-C) that shells Si but also forms robust interfacial nitrogen chemical bonds that anchors Si and MXene.During repeated lithiation and delithiation processes,the robust interfacial engineered Si/MXene configuration enhances the mechanical adhesion between Si and MXene that improves the structure stability but also contributes to form stable solid-electrolyte interphase (SEI).In addition,the N-MXene provides fast lithium ions transportation pathways.Consequently,the Si/MXene with interfacial nitrogen engineering (denoted as Si-N-MXene) deliveres high-rate performance with a specific capacity of 1498 m Ah g^(-1) at a high current of 6.4 A g^(-1).A Si-N-MXene/NMC full cell exhibited a capacity retention of 80.5%after 200 cycles.The Si-N-MXene electrode is also applied to SSB and shows a relative stable cycling over 100 cycles,demonstrating the versatility of this concept. 展开更多
关键词 Solid-state lithium-ion battery Monolithic si/MXene anode Interfacial nitrogen engineering Lithium ions transportation
下载PDF
High-performance self-organized Si nanocomposite anode for lithium-ion batteries 被引量:1
13
作者 Xiuyun Zhao Dingguo Xia +9 位作者 Lin Gu Juncheng Yue Biao Li Hang Wei Huijun Yan Ruqiang Zou Yingxia Wang Xiayan Wang Ze Zhang Jixue Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2014年第3期291-300,共10页
Silicon is being investigated extensively as an anodic material for next-generation lithium ion batteries for portable energy storage and electric vehicles.However,the large changes in volume during cycling lead to th... Silicon is being investigated extensively as an anodic material for next-generation lithium ion batteries for portable energy storage and electric vehicles.However,the large changes in volume during cycling lead to the breakdown of the conductive network in Si anodes and the formation of an unstable solid-electrolyte interface,resulting in capacity fading.Here,we demonstrate nanoparticles with a Si@Mn22.6Si5.4C4@C double-shell structure and the formation of self-organized Si-Mn-C nanocomposite anodes during the lithiation/delithiation process.The anode consists of amorphous Si particles less than 10 nm in diameter and separated by an interconnected conductive/buffer network,which exhibits excellent charge transfer kinetics and charge/discharge performances.A stable specific capacity of 1100 mAh·g-1 at 100 mA·g-1 and a coulombic efficiency of 99.2%after 30 cycles are achieved.Additionally,a rate capacity of 343 mAh·g-1 and a coulombic efficiency of 99.4%at 12000 mA·g-1 are also attainable.Owing to its simplicity and applicability,this strategy for improving electrode performance paves a way for the development of high-performance Si-based anodic materials for lithium ion batteries. 展开更多
关键词 cycling performance SELF-ORGANIZED si nanocomposite anode lithium ion batteries
下载PDF
Si-Based Anode Materials for Li-Ion Batteries:A Mini Review 被引量:19
14
作者 Delong Ma Zhanyi Cao Anming Hu 《Nano-Micro Letters》 SCIE EI CAS 2014年第4期347-358,共12页
Si has been considered as one of the most attractive anode materials for Li-ion batteries(LIBs) because of its high gravimetric and volumetric capacity. Importantly, it is also abundant, cheap, and environmentally ben... Si has been considered as one of the most attractive anode materials for Li-ion batteries(LIBs) because of its high gravimetric and volumetric capacity. Importantly, it is also abundant, cheap, and environmentally benign. In this review, we summarized the recent progress in developments of Si anode materials. First, the electrochemical reaction and failure are outlined, and then, we summarized various methods for improving the battery performance, including those of nanostructuring, alloying, forming hierarchic structures, and using suitable binders. We hope that this review can be of benefit to more intensive investigation of Si-based anode materials. 展开更多
关键词 Li-ion batteries ANODE si High capacity NANOMATERIALS
下载PDF
Effect of Magnesium on the C-S-H Nanostructure Evolution and Aluminate Phases Transition in Cement-Slag Blend 被引量:4
15
作者 丁庆军 YANG Jun +1 位作者 张高展 HOU Dongshuai 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第1期108-116,共9页
The microstructural study was conducted on cement and cement-slag pastes immersed in different concentrations of Mg(NO3)2 solutions utilizing ^29Si, ^27Al NMR spectroscopy and XRD techniques. The results show that t... The microstructural study was conducted on cement and cement-slag pastes immersed in different concentrations of Mg(NO3)2 solutions utilizing ^29Si, ^27Al NMR spectroscopy and XRD techniques. The results show that the hydration of both the cement and cement-slag pastes is delayed when the pastes are cured in Mg(NO3)2 solutions as compared to the pastes cured in water. Moreover, Mg^2+ ions also exhibit an decalcifying and dealuminizing effect on the C-A-S-H in cement and cement-slag pastes, and thereby decrease Ca/Si and Al[4]/Si ratios of the C-A-S-H. The dealuminization of C-A-S-H is mitigated for cement-slag paste as compared to pure cement paste. The depolymerized calcium and aluminum ions from C-A-S-H gel mainly enter the pore solution to maintain the pH value and form Al^[6] in TAH, respectively. On the other hand, Mg^2+ ions exert an impact on the intra-transition between Al^[6] species, from AFm and hydrogarnet to hydrotalcite-like phase. NO3^-ions are interstratified in the layered Mg-Al structure and formed nitrated hydrotalcite-like phase(Mg1-xAlx(OH)2(NO3)x·nH2O). Results from both ^27Al NMR and XRD data show that ettringite seems not to react with Mg^2+ ions. 展开更多
关键词 ^29si and ^27Al NMR magnesium ion C-A-S-H microstructure aluminate phases transition hydration slag incorporation
下载PDF
Effects of Yttrium Ion on Formation Mechanism of ZrO_2-Y_2O_3 Ceramic Coatings Formed by Plasma Electrolytic Oxidation on Al-12Si Alloy 被引量:3
16
作者 王萍 LI Jianping +2 位作者 GUO Yongchun YANG Zhong WANG Jianli 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第5期1044-1048,共5页
ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation (PEO) on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.: The results show that... ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation (PEO) on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.: The results show that adding an appropriate amount of yttrium ion can improve the growing rate of ceramic coating at different oxidation stages and decrease arc voltage. The thickness of ZrO2-Y2O3 coating is 16 μn thicker than that of ZrO2 coating and the maximum oxidation rate improves by 0.6 μm/min. In addition, the arc voltage decreases from 227 to 172 V. It can be seen that the rate of oxidation firstly increases to some extent and then decreases with the content of yttrium ion increasing. The growth rate reaches the maximum while the content of yttrium ion is 0.05 g-L-1The maximum thickness is 90 μm.Compared to ZrO2 coating, the micropores of ZrO2-Y2O3 coating are less and the ceramic layer is repeatedly deposited by ZrO2 and Y2O3 ceramic particles. Meanwhile, the binding force between coating and substrate is better and the coating is uniform and compact. The ceramic layer is mainly composed of c-Y0.15Zr0.85O1.93□0.07, m-ZrO2, α-Al2O3, ,γ-Al2O3 and Y2O3. It is indicated that ZrO2 has beert fully stabilized by yttrium ion through the formation of solid solution. 展开更多
关键词 Al-12si alloys yttrium ion plasma electrolytic oxidation ZrO2-Y2O3 ceramic coating
下载PDF
Si-doped composite carbon as anode of lithium ion batteries 被引量:6
17
作者 郭华军 李新海 +2 位作者 王志兴 彭文杰 郭永兴 《中国有色金属学会会刊:英文版》 CSCD 2003年第5期1062-1065,共4页
Si doped composite material was prepared by coating artificial graphite with the mixture of phenol resin and polysilicone and following with heat treatment at 1 050 ℃ in an argon gas atmosphere. The structure and cha... Si doped composite material was prepared by coating artificial graphite with the mixture of phenol resin and polysilicone and following with heat treatment at 1 050 ℃ in an argon gas atmosphere. The structure and characteristics of the composite carbon were determined by means of XRD, SEM, BET surface area and electrochemical measurements. The new carbon material has a disordered carbon/graphite composite structure, with silicon doped in the disordered carbon. Compared with the pristine graphite, the electrochemical performance is improved for the Si doped composite carbon with large reversible capacity of 312.6 mAh/g, high initial charge/discharge efficiency of 88.61%, and excellent cycle stability. The prototype batteries using the composite carbon as anode material have large discharge capacity of 845 mAh and high capacity retention ratio of 95.80% at the 200th cycle. 展开更多
关键词 锂离子电池 阳极 掺硅
下载PDF
Facile preparation of core-shell Si@Li4Ti5O12 nanocomposite as large-capacity lithium-ion battery anode 被引量:3
18
作者 Mengjing Liu Hanyang Gao +2 位作者 Guoxin Hu Kunxu Zhu Hao Huang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第1期89-98,I0004,共11页
As a promising alternative anode material,silicon(Si)presents a larger capacity than the commercial anode to achieve large capacity lithium-ion batteries.However,the application of pure Si as anode is hampered by limi... As a promising alternative anode material,silicon(Si)presents a larger capacity than the commercial anode to achieve large capacity lithium-ion batteries.However,the application of pure Si as anode is hampered by limitations such as volume expansion,low conductivity and unstable solid electrolyte interphase.To break through these limitations,the core-shell Si@Li4Ti5O12nanocomposite,which was prepared via in-situ self-assembly reaction and decompressive boiling fast concentration method,was proposed in this work.This anode combines the advantages of nano-sized Si particle and pure Li4Ti5O12(LTO)coating layer,improving the performance of the lithium-ion batteries.The Si@Li4Ti5O12 anode displays a high initial discharge/charge specific capacity of 1756/1383 m Ahg^-1 at 500 mAg^-1(representing high initial coulombic efficiency of 78.8%),a large rate capability(specific capacity of 620 mAhg^-1 at4000 mAg^-1),an outstanding cycling stability(reversible specific capacity of 883 mAhg^-1 after 150 cycles)and a low volume expansion rate(only 3.3% after 150 cycles).Moreover,the synthesis process shows the merits of efficiency,simplicity,and economy,providing a reliable method to fabricate large capacity Si@Li4Ti5O12nanocomposite anode materials for practical lithium-ion batteries. 展开更多
关键词 si@Li4Ti5O12 composites Core-shell nanoparticles In-situ self-assembly Decompressive boiling concentration Lithium-ion battery anode
下载PDF
Study on the Drift Effect of Potassium Ion Sensing Based on the Extended Gate Field Effect Transistor
19
作者 Jung-Chuan Chou Ching-Hsiang Hsu 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第A03期259-260,共2页
The advantages of the extended gate field effect transistor (EGFET) compared with the ion sensitive field effect transistor (ISFET) are easy package,easy preservation,insensitive light effect,and better stability.Al... The advantages of the extended gate field effect transistor (EGFET) compared with the ion sensitive field effect transistor (ISFET) are easy package,easy preservation,insensitive light effect,and better stability.Although EGFET has above advantages,there are still some non-ideal effects such as drift etc..The drift behavior exists during the measurement process and results in the variation of the output voltage with time.We can obtain the drift value by immersing EGFET into the pH solution for 12 hours and measure the rate of the output voltage versus time after S hours.This study analyzes the sensitivity, stability,and drift effect of the EGFET based on the structure of the ruthenium oxide/silicon (RuO_x/Si) wafer for measuring the potassium ion.The fabrication of the potassium ion sensor can be widely employed in medical detection. 展开更多
关键词 potassium ion extended gate field effect transistor RuO_x/si wafer sensitivity DRIFT
下载PDF
Pressure-sensitive plasticity of lithiated silicon in Li-ion batteries 被引量:1
20
作者 Ke-Jie Zhao Yong-Gang Li Laurence Brassart 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2013年第3期379-387,共9页
Lithiation-induced plasticity is a key factor that enables Si electrodes to maintain long cycle life in Li-ion batteries. We study the plasticity of various lithiated sili-con phases based on first-principles calculat... Lithiation-induced plasticity is a key factor that enables Si electrodes to maintain long cycle life in Li-ion batteries. We study the plasticity of various lithiated sili-con phases based on first-principles calculations and iden-tify the linear dependence of the equivalent yield stress on the hydrostatic pressure. Such dependence may cause the compression-tension asymmetry in an amorphous Si thin film electrode from a lithiation to delithiation cycle, and leads to subsequent ratcheting of the electrode after cyclic lithiation. We propose a yield criterion of amorphous lithi-ated silicon that includes the effects of the hydrostatic stress and the lithiation reaction. We further examine the micro-scopic mechanism of deformation in lithiated silicon under mechanical load, which is attributed to the flow-defects mediated local bond switching and cavitation. Hydrostatic compression confines the flow defects thus effectively strength-ens the amorphous structure, and vice versa. 展开更多
关键词 Li-ion batteries · si · Pressure-sensitive plasticity · Ratcheting.
下载PDF
上一页 1 2 21 下一页 到第
使用帮助 返回顶部