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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

软溶胶-凝胶法制备LiCoO2薄膜电极

陶颖; 陈振华; 祝宝军; 黄尉庄   

  1. 中南大学材料科学与工程系 长沙 410083
  • 收稿日期:2002-02-19 修回日期:2002-05-08 出版日期:2003-03-20 网络出版日期:2003-03-20

Fabrication of LiCoO2 Thin-film Electrode by Soft Solution Processing

TAO Ying; CHEN Zhen-Hua; ZHU Bao-Jun; HUANG Wei-Zhuang   

  1. Materials Science and Engineering Research Institute; Central South University of Technology; Changsha 410083; China
  • Received:2002-02-19 Revised:2002-05-08 Published:2003-03-20 Online:2003-03-20

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摘要： 采用软溶胶-凝胶技术在金属Ni基体上一步合成LiCoO2薄膜电极.其合成条件是:含钴离子和锂离子的溶液、反应温度100℃、反应压力0.1MPa、电流密度0～10mA/cm2、反应时间20h.XRD、XPS、SEM、循环伏安和恒电流充、放电等测试表明:薄膜电极LiCoO2晶体为R3m型结构;薄膜具有(101)方向的择优取向,其大小均匀、直径约为0.3μm的晶粒层状生长,层与层之间结合较紧密且有较多微孔;薄膜电极表现为多孔电极,具有良好的电性能.软溶胶-凝胶法制备薄膜电极,工艺流程短、能耗低,具有很大的发展潜力.

关键词: 软溶胶-凝胶法, LiCoO2薄膜, 薄膜电极, 电性能

Abstract: Thin films of lithium cobalt oxides were synthesized by the soft solution processing in a home-made solution. Films of LiCoO2 were deposited
onto nickel substrates at 100℃ without any postsynthesis annealing. Their structure and chemical composition were checked by
X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectrometry, cyclic voltammograms, and galvanostatic charge-discharge
pattern analysis. The prepared LiCoO2 films show R3m crystallinity and preferred orientation of (101). the films grow layer by layer with
homogenous grains, whose diameters are about 0.3μm. The thin-film electrode displays a good cyclic character and its first discharge capacity is
143mAh/g. LiCoO2 films made by soft solution processing can be used as cathode materials in lithium microbatteries.

Key words: lithium cobalt oxide, soft solution processing, thin-film electron

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