A novel carbon source coated on C-LiFePO4 as a cathode material for lithium-ion batteries

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• 作者：Ming Shi ; Ling-Bin Kong ; Jin-Bei Liu ; Kun Yan ; Jia-Jia Li ; Yan-Hua Dai…
• 关键词：Porous ; carbon ; coated LiFePO4 ; Carbothermal reduction ; Electronic conductivity ; High ; rate capability ; Lithium ; ion batteries
• 刊名：Ionics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：22
• 期：2
• 页码：185-192
• 全文大小：1,281 KB
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• 作者单位：Ming Shi (1)
  Ling-Bin Kong (1) (2)
  Jin-Bei Liu (1)
  Kun Yan (1)
  Jia-Jia Li (1)
  Yan-Hua Dai (1)
  Yong-Chun Luo (2)
  Long Kang (2)
  
  1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, People’s Republic of China
  2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Materials Science
  Physical Chemistry
  Condensed Matter
  Renewable Energy Sources
  Electrical Power Generation and Transmission
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1862-0760

文摘

The poor electronic conductivity and low lithium-ion diffusion are the two major obstacles to the largely commercial application of LiFePO₄ cathode material in power batteries. In order to improve the defects of LiFePO₄, a novel carbon source polyacrylonitrile (PAN), which would form the hierarchical porous structure after carbonization, is fabricated and used. This work comes up with a simple and facile carbothermal reduction method to prepare porous-carbon-coated LiFePO₄ (C-LiFePO₄-PC) composite and to study the effect of carbon-coated temperature on ameliorating the electrochemical performance. The obtained C-LiFePO₄-PC composite shows a high initial discharge capacity of 164.1 mA h g−1 at 0.1 C and good cycling stability as well as excellent rate capacity (49.0 mA h g−1 at 50 C). The most possible factors that improve the electrochemical performance could be related to the enhancement of electronic conductivity and the existence of porous carbon layers. In a word, the C-LiFePO₄-PC material would become an excellent candidate for application in the fields of lithium-ion batteries. Keywords Porous-carbon-coated LiFePO₄ Carbothermal reduction Electronic conductivity High-rate capability Lithium-ion batteries