Enhanced electrochemical performance of Li₄SiO₄-coated LiFePO₄ prepared by sol-gel method and microwave heating

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• 作者：Qiang Zhang^b ; Wenwen Jiang^b ; Zhufa Zhou^a ; ^b ; ^{zhouzhufa@suda.edu.cn} ; Shumei Wang^a ; ^b ; Xinshuang Guo^b ; Song Zhao^b ; Guilin Ma^b
• 关键词：Lithium ion batteries ; LiFePO4 cathode ; Li4SiO4 coating ; Sol&ndash ; gel method ; Microwave heating
• 刊名：Solid State Ionics
• 出版年：2012
• 期刊代码：96_01672738
• 类别：ch
• 出版时间：22 June, 2012
• 卷：218
• 期：Complete
• 页码：31-34
• 文件大小：697 K

摘要

In this study, Li₄SiO₄-coated LiFePO₄ cathode material was synthesized by sol-gel method and microwave heating. The structure and electrochemical properties of the prepared cathode at room temperature were investigated. The XRD results indicate that the Li₄SiO₄ coating modification does not affect the structure of LiFePO₄ and the Li₄SiO₄-coated LiFePO₄ cathode material still has olivine structure. The TEM image reveals that the Li₄SiO₄ coating is a nanoscale amorphous layer. The electrochemical measurements of Li₄SiO₄-coated LiFePO₄ show that the discharge capacity, cycling stability and interfacial resistance are improved by the Li₄SiO₄ coating. Thus, surface coating with Li₄SiO₄ is a feasible approach for enhancing the electrochemical performance of LiFePO₄.