高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (6): 1180.doi: 10.7503/cjcu20140940

• 物理化学 • 上一篇    下一篇

水系锂离子电池负极材料LiTi2(PO4)3/C的合成与电化学性能

赵平1, 文越华2(), 程杰2, 申亚举1,2, 曹高萍2, 杨裕生2   

  1. 1. 沈阳理工大学环境与化学工程学院, 沈阳 110159
    2. 北京防化研究院, 北京 100191
  • 收稿日期:2014-10-23 出版日期:2015-06-10 发布日期:2015-05-22
  • 作者简介:联系人简介: 文越华, 女, 博士, 副研究员, 主要从事化学电源及其关键材料研究. E-mail:wen_yuehua@126.com
  • 基金资助:
    国家重点基础研究发展计划项目(批准号: 2010CB227201)资助

Synthesis and Electrochemical Performance of LiTi2(PO4)3/C Anode for Aqueous Lithium-ion Batteries

ZHAO Ping1, WEN Yuehua2,*(), CHENG Jie2, SHEN Yaju1,2, CAO Gaoping2, YANG Yusheng2   

  1. 1. College of Enviromental and Chemical Engineering, Shenyang University of Technology, Shenyang 110159, China
    2. Research Institute of Chemical Defence, Beijing 100191, China
  • Received:2014-10-23 Online:2015-06-10 Published:2015-05-22
  • Contact: WEN Yuehua E-mail:wen_yuehua@126.com

摘要:

采用Pechini法合成了纳米LiTi2(PO4)3, 以聚乙烯醇(PVA)为碳源, 探讨了不同碳源分散方式下制备的碳包覆LiTi2(PO4)3电极电化学性能的影响因素. 结果表明, 纳米LiTi2(PO4)3的电化学性能主要取决于本身晶相的纯度和结晶度, 其次为LiTi2(PO4)3颗粒表面碳包覆层的均匀程度. 采用旋转蒸发的碳源分散方式制得的纳米LiTi2(PO4)3晶相纯度高, 结晶度好, LiTi2(PO4)3颗粒表面碳包覆层均匀, 电化学性能最优. 4C倍率下首次放电容量达到123 mA·h/g, 充放电循环200次容量保持率在85%以上.

关键词: 水系锂离子电池, Pechini法, LiTi2(PO4)3, 碳包覆

Abstract:

Nano-lithium titanium phosphate(LTP) was synthesized by a Pechini type method. Using polyvinyl alcohol(PVA) as a carbon source, carbon coated LTP(LTP/C) was prepared with different dispersing methods of carbon source. Factors that influence the electrochemical performance of LTP/C anode were discussed. The results indicate that the electrochemical performance of LTP/C anode is mainly dependent on the purity of crystalline phase and degree of crystallinity of LTP and the degree of uniformity for coating carbon on the surface of LTP particles. Nano LTP/C prepared by rotating evaporation dispersing method of carbon source has high purity of crystalline phase and excellent degree of crystallinity, and the coating carbon layer on the surface of nano LTP is very uniform, as a result, excellent electrochemical performance for this LTP/C anode was obtained. An initial discharge capacity of 123 mA·h/g and a capacity retention of over 85% after 200 cycles with a coulombic efficiency above 95% were observed at a 4C rate in pH-neutral 5 mol/L LiNO3.

Key words: Aqueous lithium-ion battery, Pechini method, LiTi2(PO4)3, Carbon coating

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