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学科主题: 物理化学
题名: Low-temperature electrochemical performances of LiFePO4 cathode materials for lithium ion batteries
作者: Wang, Fuqing1, 3;  Chen, Jian1;  Tan, Zhicheng1;  Wu, Minghao1, 3;  Yi, Baolian1;  Su, Wei2;  Wei, Zengfu2;  Liu, Shinian2
通讯作者: 陈剑
关键词: Low-temperature electrochemical performance ;  Lithium iron phosphate ;  Cathode materials ;  Lithium ion batteries
刊名: JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
发表日期: 2014-07-01
DOI: 10.1016/j.jtice.2014.02.013
卷: 45, 期:4, 页:1321-1330
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Engineering, Chemical
研究领域[WOS]: Engineering
英文摘要: The key factors influencing the low-temperature electrochemical performances of LiFePO4 cathode materials are systematically investigated by measuring and comparing the amount of surface carbon, particle size, and conductivities of LiFePO4, LiFePO4/C and electrolyte in the temperatures range of -20 to 40 degrees C. It is found that the low-temperature electrochemical performance of the material is improved obviously by coating the surface of LiFePO4 with carbon. At -20 degrees C, the discharge specific capacity of LiFePO4/C with 4 wt% surface carbon is 81.4 mAh/g, while the uncoated LiFePO4 only delivers the discharge specific capacity of 27.7 mAh/g. The low-temperature electrochemical performance of LiFePO4/C has no significant change as increasing the carbon content, but is further improved by reducing the particle size. In order to understand the difference of low-temperature electrochemical performance between the carbon-coated and uncoated LiFePO4 cathodes, the ionic conductivity of electrolyte, the electronic/ionic conductivities of LiFePO4 and LiFePO4/C at various temperatures were measured. The electronic conductivity of LiFePO4 with 4.9 x 10(-11) S/cm at -20 degrees C is found to be responsible for its poor low-temperature electrochemical performance. However, for the LiFePO4/C, the low-temperature electrochemical performance is mainly determined by its ionic conductivity, therefore, the decrease of the particle size can increase the low-temperature electrochemical performance. (C) 2014 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
关键词[WOS]: ELECTRICAL-CONDUCTIVITY ;  HYDROTHERMAL SYNTHESIS ;  DIFFUSION-COEFFICIENT ;  PHOSPHO-OLIVINES ;  ROOM-TEMPERATURE ;  CARBON ;  COMPOSITES ;  ELECTRODE ;  IMPACT ;  NANOCOMPOSITES
语种: 英语
WOS记录号: WOS:000340352000028
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143910
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Adv Rechargeable Batteries Lab, Dalian 116023, Peoples R China
2.Guangdong Power Grid Corp, Elect Power Res Inst, Guangzhou 510080, Guangdong, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100039, Peoples R China

Recommended Citation:
Wang, Fuqing,Chen, Jian,Tan, Zhicheng,et al. Low-temperature electrochemical performances of LiFePO4 cathode materials for lithium ion batteries[J]. JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS,2014,45(4):1321-1330.
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