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Anthraquinone derivative as high-performance anode material for sodium-ion batteries using ether-based electrolytes 被引量:2
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作者 Linqin Mu Yaxiang Lu +5 位作者 Xiaoyan Wu Yuejun Ding Yong-Sheng Hu Hong Li Liquan Chen Xuejie Huang 《Green Energy & Environment》 SCIE 2018年第1期63-70,共8页
Organic materials, especially the carbonyl compounds, are promising anode materials for room temperature sodium-ion batteries owing to their high reversible capacity, structural diversity as well as eco-friendly synth... Organic materials, especially the carbonyl compounds, are promising anode materials for room temperature sodium-ion batteries owing to their high reversible capacity, structural diversity as well as eco-friendly synthesis from bio-mass. Herein, we report a novel anthraquinone derivative, C_(14)H_6 O_4 Na_2 composited with carbon nanotube(C_(14)H_6 O_4 Na_2-CNT), used as an anode material for sodium-ion batteries in etherbased electrolyte. The C_(14)H_6 O_4 Na_2-CNT electrode delivers a reversible capacity of 173 mAh g^(-1) and an ultra-high initial Coulombic efficiency of 98% at the rate of 0.1 C. The capacity retention is 82% after 50 cycles at 0.2 C and a good rate capability is displayed at 2 C.Furthermore, the average Na insertion voltage of 1.27 V vs. Na^+/Na makes it a unique and safety battery material, which would avoid Na plating and formation of solid electrolyte interface. Our contribution provides new insights for designing developed organic anode materials with high initial Coulombic efficiency and improved safety capability for sodium-ion batteries. 展开更多
关键词 ANTHRAQUINONE C14H6O4Na2-CNT anode material Ether-based electrolyte Sodium-ion batteries
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纳米碳管复合及聚苯胺包覆Sb_(2)MoO_(6)复合材料的制备及储锂性能研究
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作者 张锐 徐芳芳 +3 位作者 李佳仪 苏拉 王石泉 刘红英 《湖北大学学报(自然科学版)》 CAS 2024年第3期376-383,共8页
以三氟化锑和钼酸铵为锑源和钼源,采用水热法制备出锑钼锑(Sb_(2)MoO_(6))和Sb_(2)MoO_(6)/纳米碳管(CNTs)复合物,利用苯胺聚合在Sb_(2)MoO_(6)和Sb_(2)MoO_(6)/CNTs上继续包覆聚苯胺(PANI)得到Sb_(2)MoO_(6)@PANI (Sb_(2)MoO_(6)/CNT)@... 以三氟化锑和钼酸铵为锑源和钼源,采用水热法制备出锑钼锑(Sb_(2)MoO_(6))和Sb_(2)MoO_(6)/纳米碳管(CNTs)复合物,利用苯胺聚合在Sb_(2)MoO_(6)和Sb_(2)MoO_(6)/CNTs上继续包覆聚苯胺(PANI)得到Sb_(2)MoO_(6)@PANI (Sb_(2)MoO_(6)/CNT)@PANI。采用XRD、SEM、EDX等手段对样品结构和形貌进行表征,结果发现制备的Sb_(2)MoO_(6)为不均匀的长为10μm的棒状形貌,而CNTs复合后的Sb_(2)MoO_(6)形貌变成厚约为100 nm的片状。作为锂离子电池负极材料,对所有合成的样品进行电化学性能测试,探讨CNTs复合和聚苯胺(PANI)包覆对Sb_(2)MoO_(6)样品的电化学性能的影响。结果表明:Sb_(2)MoO_(6)@PANI、Sb_(2)MoO_(6)/CNTs、(Sb_(2)MoO_(6)/CNTs)@PANI样品的电化学性能均优于Sb_(2)MoO_(6),其中(Sb_(2)MoO_(6)/CNT)@PANI具有最佳的电化学性能。(Sb_(2)MoO_(6)/CNT)@PANI在电压范围为0.01~3 V、电流密度为100 mA·g^(-1)条件下,循环100圈后,放电比容量为650 mAh·g^(-1)。CNTs复合和PANI包覆后的Sb_(2)MoO_(6),颗粒粒径大大降低,还增加了钼酸锑的导电性(阻抗161Ω),在电化学循环过程中有效延缓了Sb_(2)MoO_(6)材料的体积崩塌。 展开更多
关键词 负极材料 水热法 Sb_(2)MoO_(6) 电化学性能 锂离子电池
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CNTs含量对SnO2-MnSn(OH)6/CNTs锂离子电池负极材料性能的影响 被引量:1
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作者 何声太 曾林海 陈媛 《天津工业大学学报》 CAS 北大核心 2020年第6期47-52,共6页
为了改善锡基负极材料的电化学性能,以SnCl4·5H2O和MnC4H6O4·4H2O为前驱体通过水热法一步合成MnSn(OH)6/CNTs纳米复合材料,并使用XRD、SEM、电化学工作站和蓝电测试系统来对复合材料的结构和性能进行表征、测试。结果显示:碳... 为了改善锡基负极材料的电化学性能,以SnCl4·5H2O和MnC4H6O4·4H2O为前驱体通过水热法一步合成MnSn(OH)6/CNTs纳米复合材料,并使用XRD、SEM、电化学工作站和蓝电测试系统来对复合材料的结构和性能进行表征、测试。结果显示:碳纳米管(CNTs)的加入能够有效改善SnO2-MnSn(OH)6的电化学性能;所有复合材料中,SnO2-MnSn(OH)6/CNTs15性能最佳,在200 mA/g的电流密度下SnO2-MnSn(OH)6/CNTs15首圈放电比容量为2632.2 mA·h/g,首次库伦效率为56.1%,150圈之后比容量仍保持在565 mA·h/g,且其倍率性能也比其他材料优异,在1A/g的电流密度下,平均放电比容量仍然有512.6 mA·h/g。 展开更多
关键词 锂离子电池 SNO2 MnSn(OH)6 CNTS 负极材料
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掺杂对Sr_(2)Fe_(1.5)Mo_(0.5)O_(6-δ)阳极材料电化学性能影响研究进展 被引量:4
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作者 张少威 蒲秀好 +2 位作者 万艳红 祝康 夏长荣 《材料工程》 EI CAS CSCD 北大核心 2021年第9期1-13,共13页
固体氧化物燃料电池是一种将化学能直接转化为电能的清洁、高效的能量转化器件。传统的金属陶瓷阳极材料存在碳沉积、硫中毒和氧化还原循环稳定性差等缺点,限制了其商业化应用。为了改善金属陶瓷阳极在实际应用中遇到的问题,近年来混合... 固体氧化物燃料电池是一种将化学能直接转化为电能的清洁、高效的能量转化器件。传统的金属陶瓷阳极材料存在碳沉积、硫中毒和氧化还原循环稳定性差等缺点,限制了其商业化应用。为了改善金属陶瓷阳极在实际应用中遇到的问题,近年来混合电子-离子导体的钙钛矿陶瓷阳极得到了长足的发展。其中,结构组成为Sr_(2)Fe_(1.5)Mo_(0.5)O_(6-δ)的阳极材料具有较好的稳定性、较高的电导率、合适的热膨胀系数和优异的电化学性能,因而被广泛研究,特别是元素掺杂。本工作根据钙钛矿ABO_(3)可掺杂的位置,分别从A位、B位和O位掺杂进行讨论,总结了各元素掺杂和掺杂量对Sr_(2)Fe_(1.5)Mo_(0.5)O_(6-δ)的容忍因子、晶体结构、稳定性、电导率、热膨胀系数和电化学性能等的影响。这些掺杂策略为改性Sr_(2)Fe_(1.5)Mo_(0.5)O_(6-δ)钙钛矿阳极提供了新颖的思路,此思路也可用于改性其他同类钙钛矿阳极材料。最后总结了Sr_(2)Fe_(1.5)Mo_(0.5)O_(6-δ)和典型钙钛矿陶瓷阳极材料的发展方向:一方面可通过阴离子掺杂和共掺杂策略进一步提高钙钛矿陶瓷阳极材料的性能;另一方面可采用密度泛函理论进一步阐明元素掺杂的作用机制。 展开更多
关键词 固体氧化物燃料电池 阳极材料 钙钛矿 Sr_(2)Fe_(1.5)Mo_(0.5)O_(6-δ) 元素掺杂
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Self-assembly synthesis of SnNb2O6/amino-functionalized graphene nanocomposite as high-rate anode materials for sodium-ion batteries 被引量:6
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作者 Min Huang Ji-Xin Liu +2 位作者 Peng Huang Hai Hu Chao Lai 《Rare Metals》 SCIE EI CAS CSCD 2021年第2期425-432,共8页
A two-dimensional(2 D)SnNb_(2)O_(6)/amino-functionalized graphene(En-RGO)nanocomposite with a representative 2 D-2 D architecture has been constructed by an easy self-assembly approach and firstly investigated as anod... A two-dimensional(2 D)SnNb_(2)O_(6)/amino-functionalized graphene(En-RGO)nanocomposite with a representative 2 D-2 D architecture has been constructed by an easy self-assembly approach and firstly investigated as anode materials for secondary sodium-ion batteries.The SnNb_(2)O_(6)nanosheets are evenly anchored with the aminofunctionalized graphene through electrostatic attractive interplay between the negatively charged SnNb_(2)O_(6)and positively charged En-RGO after modification.As a result,a remarkable reversible capacity of 300 mAh·g^(-1)was obtained at 50 mA·g^(-1),and significantly,the En-RGO electrode could also deliver ultra-long calendar life up to1900 cycles with a high reversible capacity of200 mAh·g^(-1)at current of 500 mA·g^(-1).Such excellent electrochemical characteristics can be mainly ascribed to its fast pseudo-capacitive energy storage mechanism,and the capacitive contribution can even reach up to 90%at1.2 mV·s^(-1). 展开更多
关键词 SnNb2O6 Amino-functionalized graphene anode material Sodium-ion batteries
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Double perovskite oxides Sr_2Mg_(1-x)Fe_xMoO(6-δ) for catalytic oxidation of methane 被引量:6
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作者 Chen Li Wendong W ang +3 位作者 Congying Xu Yuanxu Liu BO He Chusheng Chen 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2011年第4期345-349,共5页
The double perovskite oxides Sr2Mg1-xF exMoO6-δ were investigated as catalysts for the methane oxidation.The structural properties of catalysts were characterized in detail by X-ray diffraction,X-ray photoelectron sp... The double perovskite oxides Sr2Mg1-xF exMoO6-δ were investigated as catalysts for the methane oxidation.The structural properties of catalysts were characterized in detail by X-ray diffraction,X-ray photoelectron spectroscopy and X-ray absorption spectroscopy.The catalytic property was strongly influenced by the Fe substitution.The relation between catalytic performance and the degree of Fe substitution was examined with regard to the structure and surface characteristics of the mixed oxides.The Fe-containing catalysts exhibited higher activity attributable to the possible(Fe2+,Mo6+) and (Fe3+,Mo5+)valency pairs,and the highest activity was observed for Sr2Mg0.2Fe0.8MoO6-δ.The enhancement of the catalytic activity may be correlated with the Fe-relating surface lattice oxygen species and was discussed in view of the presence of oxygen vacancies. 展开更多
关键词 catalytic combustion METHANE double perovskites Sr2Mg1-xF exMoO6-δ SOFC anode materials
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Facile synthesized Cu-SnO2 anode materials with three-dimensional metal cluster conducting architecture for high performance lithium-ion batteries 被引量:3
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作者 Zhijia Zhang Yuxuan Hou +9 位作者 Shaofei Zhang Guoliang Zhang Ming Li Huanming Lu Yong Li Xuerong Zheng Zhijun Qiao Zhenyang Yu Qin Huang Jianli Kang 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第11期1656-1660,共5页
Metal oxide anode material is one of promising candidates for the next-generation LIBs, due to its high theoretical capacity and low cost. The poor conductivity and huge volume change during charge/ discharge, however... Metal oxide anode material is one of promising candidates for the next-generation LIBs, due to its high theoretical capacity and low cost. The poor conductivity and huge volume change during charge/ discharge, however, restrict the commercialization of metal oxide anode material. In this work, we design a novel Cu-SnO2 composite derived from Cu6Sn5 alloy with three dimensional (3D) metal cluster conducting architecture. The novel Cu structure penetrates in the composite particles inducing high conductivity and space-confined SnO2, which restrict the pulverization of SnO2 during lithiation/ delithiation process. The optimized Cu-SnO2 composite anode delivers an initial discharge capacity of 933.7 mA h/g and retains a capacity of 536.1 mA h/g after 200 cycles, at 25℃ and a rate of 100 mA/g. Even at the high rate of 300 mA/g, the anode still exhibits a capacity of more than 29% of that tested at 50 mA/g. Combining with the phase and morphology analysis, the novel Cu-SnO2 composite not only has good electrical conductivity, but also possesses high theoretical capacity (995 mAh/g), which may pave a new way for the design and construction of next-generation metal oxide anode materials with high power and cycling stability. 展开更多
关键词 Cu-SnO2 composite Cu6Sn5 alloy Ball milling anode materials Lithium-ion batteries
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Structure and electrochemical performance of Ba Li_(2-x)Na_xTi_6O_(14)(0≤x≤2) as anode materials for lithium-ion battery 被引量:1
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作者 陶伟 徐茂莲 +2 位作者 朱彦荣 张千玉 伊廷锋 《Science China Materials》 SCIE EI CSCD 2017年第8期728-738,共11页
A series of Ba Li_(2-x)NaxTi_6O_(14)(0≤x≤2) compounds as lithium storage materials were synthesized by a facile solidstate method. X-ray diffraction Rietveld refinement shows that the Bragg positions correspon... A series of Ba Li_(2-x)NaxTi_6O_(14)(0≤x≤2) compounds as lithium storage materials were synthesized by a facile solidstate method. X-ray diffraction Rietveld refinement shows that the Bragg positions correspond to the Ba Li_2Ti_6O_(14), indicating a successful preparation. The Na+ions doped Ba Li_2-Ti_6O_(14) compounds have larger unit-cell volume than the pristine one because ionic radius of Na+ion is 55% larger than that of Li+ion. SEM shows that the Ba Li_2-xNaxTi_6O_(14)(x=0, 0.5 and1) powders show similar irregular shaped particles between500 and 1000 nm. However, Ba Li_2-xNaxTi_6O_(14)(x=1.5 and 2)powders show similar rod-like shape. CV reveals that the passivating film is mainly formed during the first insertion process, and the solid electrolyte interface film on the surface of Ba Li_2-xNaxTi_6O_(14)(0≤x≤2) is formed below 0.7 V in the first cycle. Compared with other samples, Ba Li_0.5Na1.5Ti_6O_(14) exhibits higher reversible capacity, better rate capability and superior cyclability. Ba Li_0.5Na1.5Ti_6O_(14) delivers the delithiation capacities of 162.1 mAhg^-(1)at 50 m A g^-(1), 158.1 mAhg^-(1)at 100 m A g^-(1), 156.7 mAhg^-(1)at 150 m A g^-(1), 152.2 mAhg^-(1)at 200 m A g^-(1), 147.3 mAhg^-(1)at 250 m A g^-(1)and 142 mAhg^-(1)at 300 m A g^-(1), respectively. An interesting thing is that Ba Na2Ti_6O_(14) as anode also shows an acceptable electrochemical performance. All these improved electrochemical performances of Ba Li_0.5Na1.5Ti_6O_(14) are attributed to the lowest polarization and the highest lithium ion diffusion coefficient among all samples.Hence, Ba Li_0.5Na1.5Ti_6O_(14) with excellent cycling performance,simple synthesis route and wide discharge voltage range can be a possible anode candidate for lithium-ion batteries. 展开更多
关键词 Ba Li2Ti6O14 Ba Na2Ti6O14 anode material lithiumion battery delithiation capacity
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Hollow and hierarchical Na_2Li_2Ti_6O_(14) microspheres with high electrochemical performance as anode material for lithium-ion battery 被引量:1
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作者 范姗姗 仲华 +3 位作者 于海涛 娄明 谢颖 朱彦荣 《Science China Materials》 SCIE EI CSCD 2017年第5期427-437,共11页
Relying on a solvent thermal method, spherical Na2Li2Ti6O14 was synthesized. All samples prepared by this method are hollow and hierarchical structures with the size of about 2-3 μtm, which are assembled by many prim... Relying on a solvent thermal method, spherical Na2Li2Ti6O14 was synthesized. All samples prepared by this method are hollow and hierarchical structures with the size of about 2-3 μtm, which are assembled by many primary nanoparticles (-300nm). Particle morphology analysis shows that with the increase of temperature, the porosity increases and the hollow structure becomes more obvious. Na2Li2Ti6Ol4 obtained at 800℃ exhibits the best electro- chemical performance among all samples. Charge-discharge results show that Na2Li2Ti6O14 prepared at 800℃ can delivers a reversible capacity of 220.1, 181.7, 161.6, 144.2, 118.1 and 97.2 mA h g-1 at 50, 140, 280, 560, 1400, 2800 mA g-1. How- ever, Na2Li2Ti6O4-bulk only delivers a reversible capacity of 187, 125.3, 108.3, 88.7, 69.2 and 54.8 mA h g-1 at the same current densities. The high electrochemical performances of the as-prepared materials can be attributed to the distinctive hollow and hierarchical spheres, which could effectively reduce the diffusion distance of Li ions, increase the con- tact area between electrodes and electrolyte, and buffer the volume changes during Li ion intercalation/deintercalation processes. 展开更多
关键词 Na2Li2Ti6O14 hollow structure anode material elec-trochemical performance lithium ion battery
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Improving the stability,lithium diffusion dynamics,and specific capacity of SrLi_(2)Ti_(6)O_(14)via ZrO_(2)coating
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作者 Hong-Li Ding Hai-Tao Yu +4 位作者 Xiao-dong Wang Chen-Feng Guo Bing Zheng Ying Xie Ting-Feng Yi 《Green Energy & Environment》 SCIE EI CSCD 2022年第1期53-65,共13页
SrLi_(2)Ti_(6)O_(14)(SLTO)coated with different amount of ZrO_(2)was successfully prepared.The as-obtained composites are stacked by a series of particles with a pure phase structure and a good crystallinity.Furthermo... SrLi_(2)Ti_(6)O_(14)(SLTO)coated with different amount of ZrO_(2)was successfully prepared.The as-obtained composites are stacked by a series of particles with a pure phase structure and a good crystallinity.Furthermore,ZrO_(2)coating not only enhances the structural stability of the materials but also facilitates the diffusion of lithium through the SEI film.As a result,the redox polarization was reduced,and the reversibility of the electrochemical reaction was enhanced.Particularly,SLTO-ZrO_(2)-2 sample delivers a high initial lithiation capacity of 283.6 mA h g^(-1),and the values maintain at 251.7,228.0,207.4,175.3,and 147.7 mA h g^(-1)at the current densities of 0.13,0.26,0.54,1.31,and 2.62 A g^(-1),respectively.Our experiment also confirmed that SLTO materials coated with ZrO_(2)are suitable for high power density applications,and the lithiation specific energy efficiency of SLTO-ZrO_(2)-2 is 200%as high as that of pure SLTO at a power density of 1257 W kg^(-1). 展开更多
关键词 SrLi_(2)Ti_(6)O_(14) ZrO_(2)coating Structural stability anode material Electrochemical performance
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Construction of Na_(2)Li_(2)Ti_(6)O_(14)@LiAlO_(2)Composites as Anode Materials of Lithium-Ion Battery with High Performance
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作者 Nan Zhang Ze-Chen Lv +3 位作者 Yu-Shen Zhao Jun-Hong Zhang Yan-Rong Zhu Ting-Feng Yi 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2022年第12期2047-2056,共10页
In this work,we construct Na_(2)Li_(2)Ti_(6)O_(14)@LiAlO_(2)(NLTO-L)composites by a simple ball milled process and post-calcination in air atmosphere to improve the electrochemical performance.The thickness of the LiA... In this work,we construct Na_(2)Li_(2)Ti_(6)O_(14)@LiAlO_(2)(NLTO-L)composites by a simple ball milled process and post-calcination in air atmosphere to improve the electrochemical performance.The thickness of the LiAlO_(2)coating layer is approximate2 nm.The morphology and particle size of Na_(2)Li_(2)Ti_(6)O_(14)are not dramatically altered after LiAlO_(2)coating.All samples display similar particles with a size range from 150 to 500 nm.The LiAlO_(2)coating can supply fast charge transmission paths with good insertion/extraction dynamics of lithium ions and provide an excellent rate performance and cycle performance of as-prepared Na_(2)Li_(2)Ti_(6)O_(14)@LiAlO_(2)anodes.Therefore,LiAlO_(2)coating efficiently enhances the rate performance and cycle performance of Na_(2)Li_(2)Ti_(6)O_(14)anode,even at large current densities.As a result,Na_(2)Li_(2)Ti_(6)O_(14)@LiAlO_(2)(5 wt%)reveals remarkable rate properties with reversible charge capacity of 238.7,214.7,185.8,168.5 and 139.8 mAh g^(-1)at 50,100,200,300 and 500 mA g^(-1),respectively.Na_(2)Li_(2)Ti_(6)O_(14)@LiAlO_(2)(5 wt%)also possesses a good cycle performance with a de-lithiation capacity of 166.5 mAh g-1 at 500 mA g^(-1)after 200 cycles.Nonetheless,the corresponding de-lithiation capacity of pure Na_(2)Li_(2)Ti_(6)O_(14)is only 140.1 mAh g^(-1).Consequently,LiAlO_(2)coating is efficeient approach to enhance the electrochemical performances of Na_(2)Li_(2)Ti_(6)O_(14). 展开更多
关键词 Li-ion batteries Na_(2)Li_(2)Ti_(6)O_(14) LiAlO_(2) anode material Electrochemical properties
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Free-standing SnNb_(2)O_(6)@CSN film as flexible anode for high performance sodium-ion batteries
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作者 Xuemin Yin Tao Liu +5 位作者 Xiuping Yin Xiaochen Feng Yiming Liu Qinhao Shi Xingli Zou Yufeng Zhao 《Chinese Chemical Letters》 SCIE CAS CSCD 2023年第7期284-288,共5页
Free-standing electrodes are promising candidates for flexible rechargeable batteries, toward the application of flexible energy storage devices, due to their merits of additive-free, lightweight, and high energy dens... Free-standing electrodes are promising candidates for flexible rechargeable batteries, toward the application of flexible energy storage devices, due to their merits of additive-free, lightweight, and high energy density. Herein, we report a free-standing SnNb_(2)O_(6)@CSN flexible film with SnNb_(2)O_(6) encapsulated in 3D carbon skeleton nanofibers by electrospinning and carbonization processes as flexible anode for sodium-ion batteries(SIBs). The 3D carbon skeleton nanofibers serve as ion/electron transport pathway to improve the electrochemical reaction kinetics and meanwhile alleviate the volume changes of SnNb_(2)O_(6) during charge-discharge processes. The as-constructed half-cell(SnNb_(2)O_(6)@CSN‖Na) exhibits excellent cycling stability of 99.2 m Ah/g at 0.5 A/g after 950 cycles(coulombic efficiency of ~100%) and a high rate performance of 108.6 mAh/g at 10 A/g. In addition, the pouch cell can light up the LEDs at different bending angles(0°, 90°, 180°). This research shows a promising anode material for flexible energy storage electronics. 展开更多
关键词 FREE-STANDING SnNb_(2)O_(6)@CSN anode Sodium-ion batteries Flexible material
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PPy-Encapsulated Na_(2)Li_(2)Ti_(6)O_(14) Composites as High-Performance Anodes for Li-Ion Battery
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作者 Fan-Fan Wang Nan Zhang +3 位作者 Ze-Chen Lv Yan-Rong Zhu Jun-Hong Zhang Ting-Feng Yi 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2022年第11期1873-1881,共9页
Na_(2)Li_(2)Ti_(6)O_(14) as a reliable anode material is becoming a hopeful candidate for Li-ion battery.Nevertheless,the pristine Na_(2)Li_(2)Ti_(6)O_(14) usually suffer from bad rate performance and poor cycling sta... Na_(2)Li_(2)Ti_(6)O_(14) as a reliable anode material is becoming a hopeful candidate for Li-ion battery.Nevertheless,the pristine Na_(2)Li_(2)Ti_(6)O_(14) usually suffer from bad rate performance and poor cycling stability under high current due to limited diffusion kinetics and poor electrical conductivity.Here,the PPy-coated Na_(2)Li_(2)Ti_(6)O_(14) composites are successfully obtained via the solid-state method and followed by chemical oxidation process in the first time.The results of tests prove that the Na_(2)Li_(2)Ti_(6)O_(14)@PPy composites have better electrochemical performance than the bare Na_(2)Li_(2)Ti_(6)O_(14) because of the excellent electrical conductivity and the special macromolecular architecture of PPy.In particular,the Na_(2) Li_(2) Ti_(6) O_(14) @PPy(4 wt%)exhibits excellent charge capacities of about 223.2,218.0,200.8,184.3 and 172.6 mAh g^(-1) at 50,100,200,300 and500 mA g^(-1),respectively,revealing the best rate capability of all electrode materials.The Na_(2)Li_(2)Ti_(6)O_(14)@PPy(4 wt%)not only has the highest charge capacity under 0.5 mA g^(-1),but also has the highest capacity retention of 85.12%among all samples after 100 loops.Hence,the PPy coating is known as a promising way to improve the electrochemical property of Na_(2)Li_(2)Ti_(6)O_(14).The PPy-coated Na_(2)Li_(2)Ti_(6)O_(14) demonstrates the great prospect as promising negative materials for Li-ion batteries. 展开更多
关键词 Li-ion battery anode material Na_(2)Li_(2)Ti_(6)O_(14) PPy coating Electrochemical property
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Tunable ultrathin dual-phase P-doped Bi_(2)MoO_(6) nanosheets for advanced lithium and sodium storage 被引量:1
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作者 Fucong Lyu Zhe Jia +9 位作者 Shanshan Zeng Fei-Xiang Ma Lulu Pan Lizi Cheng Yan Bao Ligang Sun Weihui Ou Peng Du Yang Yang Li Jian Lu 《Nano Research》 SCIE EI CSCD 2022年第7期6128-6137,共10页
The construction of electrode materials for lithium-ion batteries(LIBs)and sodium-ion batteries(SIBs)has gradually been an appealing and attractive technology in energy storage research field.In the present work,a fac... The construction of electrode materials for lithium-ion batteries(LIBs)and sodium-ion batteries(SIBs)has gradually been an appealing and attractive technology in energy storage research field.In the present work,a facile strategy of synthesizing ultrathin amorphous/nanocrystal dual-phase P-doped Bi_(2)MoO_(6)(denoted as P-BiMO)nanosheets via a one-step wet-chemical synthesis approach is explored.Quite distinct from conventional two-dimensional(2D)nanosheets,our newly developed ultrathin P-BiMO nanosheets exhibit a unique tunable amorphous/nanocrystalline dual-phase structure with several compelling advantages including fast ion exchange ability and superb volume change buffer capability.The experimental results reveal that our prepared P-BiMO-6 electrode delivers an excellent reversible capacity of 509.6 mA·g^(−1) after continuous 1,500 cycles at the current densities of 1,500 mA·g^(−1) and improved rate performance for LIBs.In the meanwhile,the P-BiMO-6 electrode also shows a reversible capacity of 300.6 mA·g^(−1) after 100 cycles at 50 mA·g^(−1) when being used as the SIBs electrodes.This present work uncovers an effective dual-phase nanosheet structure to improve the performance of batteries,providing an attractive paradigm to develop superior electrode materials. 展开更多
关键词 amorphous/nanocrystalline dual-phase structure ultrathin nanosheets P-doped Bi_(2)MoO_(6) anode materials lithium-ion batteries sodium-ion batteries
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