journal6 ›› 2012, Vol. 33 ›› Issue (5): 98-101.DOI: 10.3969/j.issn.1007-2985.2012.05.025

• 化学化工 • 上一篇    下一篇

尖晶石型Li4Ti5O12的合成及其性能

  

  1. (1.吉首大学化学化工学院,湖南 吉首 416000;2.湘西自治州矿产与新材料技术创新服务中心,湖南 吉首 416000)
  • 出版日期:2012-09-25 发布日期:2012-11-30
  • 通讯作者: 吴显明(1967-),男,吉首大学化学化工学院教授,硕士生导师,博士;E-mail:xianmingwu@163.com.
  • 作者简介:麦发任(1983-),男,海南海口人,硕士研究生,主要从事锂离子电池材料研究

Synthesis and Electrochemical Properties of Spinel Li4Ti5O12

  1. (1.College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,Hunan China;2.Xiangxi Ores and New Materials Development and Service Center,Jishou 416000,Hunan China)
  • Online:2012-09-25 Published:2012-11-30

摘要:采用高温固相法、溶胶-凝胶法和热聚合法制备锂离子电池负极材料Li4Ti5O12.通过X-射线衍射、扫描电镜显微镜、电化学阻抗和恒流充放电表征产物的结构、形貌及电化学性能.3种方法制备的Li4Ti5O12均为尖晶石结构,用高温固相法所得的粉体颗粒较大,而用溶胶-凝胶法所得粉体颗粒最小,其平均粒度在200~350 nm范围内,表现出较好的电化学性能;溶胶-凝胶法制备的样品粉末在0.2 C倍率下首次放电容量为174.5 mAh/g,经过25次循环后容量衰减仅5.7%.

关键词: 锂离子电池, 负极材料, Li4Ti5O12, 高温固相, 溶胶-凝胶, 热聚合

Abstract: The anode material Li4Ti5O12 for Li-ion battery was synthesized by high temperature solid-state method,sol-gel method and thermal polymerization method.Its structural characterization,surface morphology and electrochemical performance of products were characterized by X-ray diffractometry,scanning electron microscopy,electrochemical impedance spectroscopy,and galvanostatic charge-discharge test.The result shows that Li4Ti5O12 prepared by the three methods had perfect spinel structure.The powders prepared by high temperature solid-state were the biggest,while the powders prepared by sol-gel were the smallest with an average dimension of 200~350 nm and exhibited better electrochemical performance.Its initial specific discharge capacity was 174.5 mAh/g at 0.2 C rate,only reducing 5.7% after 25 cycles.

Key words: Li-ion battery, anode material, Li4Ti5O12, high temperature solid-state, sol-gel, thermal polymerization

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