高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

采用新颖喷墨打印技术制备的薄膜LiCoO2电极及其电化学性能

赵尧敏1,2, 许娟2, 刘玲2, 杨洁2, 江志裕2   

    1. 中原工学院材料与化工学院, 郑州 450007;
    2. 复旦大学化学系, 上海市分子催化与新材料重点实验室, 上海 200433
  • 收稿日期:2006-08-05 修回日期:1900-01-01 出版日期:2007-06-10 发布日期:2007-06-10
  • 通讯作者: 江志裕

Thin Film LiCoO2 Cathode Prepared by Using Ink-jet Printing Technique and Its Electrochemical Properties

ZHAO Yao-Min1,2, XU Juan2, LIU Ling2, YANG Jie2, JIANG Zhi-Yu2*   

    1. College of Material and Chemical Engineering, Zhongyuan Institute of Technology, Zhengzhou 450007, China;
    2. Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433, China
  • Received:2006-08-05 Revised:1900-01-01 Online:2007-06-10 Published:2007-06-10
  • Contact: JIANG Zhi-Yu

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摘要： 采用喷墨打印技术制备了LiCoO2薄膜电极. 用X射线衍射、扫描电镜(SEM)、循环伏安和恒电流充放电试验对薄膜电极进行结构表征和电化学性能测试. SEM结果表明, 所制备的薄膜电极表面粒子分布均匀, 厚度约为1.27 μm. 经过轻微热处理(450 ℃, 30 min)的薄膜LiCoO2电极呈现出稳定的充放电循环性能. 当以20 μA/cm2进行充放电时, 第50次循环容量保持率约为首次放电容量(81 mA·h/g)的87%, 10次循环后的充放电过程的充放电效率均接近100％.

关键词: 计算机喷墨打印, 薄膜电极, 锂离子电池, LiCoO2

Abstract: Thin film LiCoO2 electrodes were successfully prepared with a novel facile and low-cost computer ink-jet printing technique. For preparing the stable colloid “ink”, wet ball-milling was employed to stabilize the nano LiCoO2 particles and conducting agent acetylene black(AB) while two kinds of polymeric hyper dispersants CH10B and CH12B were used, respectively. Nano LiCoO2 particles were synthesized through the self-assembly method using triblock copolymer P123 as a template. The morphology, crystal structure and electrochemical performance of jet printing LiCoO2 thin film electrodes were investigated in detail via SEM, XRD, cyclic voltammograms(CV) and galvanostatic charge-discharge measurements. It was determined that the average thickness of the as-printed thin-film LiCoO2 electrode was about 1.27 m. The CV curves show that the heat treatment was benefit for improving the electrochemical properties of electrode. After a slight annealing process at 450 ℃ for 30 min, the thin film electrode presented a good reversible CV behavior. In the cycling process with constant charge-discharge current 20 A/cm2 within the potential range of 3.0—4.2 V(vs. Li+/Li), the initial discharge capacity of thin film LiCoO2 electrode was 81 mA·h/g, and after 50 cycles it remained 87%. After 10 cycles the charge-discharge efficiency reached near 100%.

Key words: Computer ink-jet printing, Thin-film electrode, Lithium ion battery, LiCoO2

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