高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (8): 1492.

• 研究论文 • 上一篇    下一篇

新型锂离子电池正极材料Li0.86V0.8O2的水热合成及性质

胡方1, 杜菲2 , 陈岩3, 魏英进1, 明星1, 陈岗2 , 王春忠1   

  1. 1. 吉林大学材料科学与工程学院,
    2. 物理学院,
    3. 无机合成与制备化学国家重点实验室, 长春 130012
  • 收稿日期:2008-09-27 出版日期:2009-08-10 发布日期:2009-08-10
  • 通讯作者: 王春忠, 男, 博士, 副教授, 主要从事功能材料研究. E-email: wcz@mail. jlu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 50672031)、教育部长江学者和创新团队发展计划(批准号: IRT0625)和吉林省科技发展计划(批准号: 20060511)资助.

Hydrothermal Synthesis and Properties of New Cathode Material Li0.86V0.8O2

HU Fang1, DU Fei2 , CHEN Yan3, WEI Ying-Jin1, MING Xing1, CHEN Gang2 , WANG Chun-Zhong1*   

  1. 1. College of Materials Science and Engineering,
    2. College of Physics,
    3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China
  • Received:2008-09-27 Online:2009-08-10 Published:2009-08-10
  • Contact: WANG Chun-Zhong. E-email: wcz@mail. jlu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 50672031)、教育部长江学者和创新团队发展计划(批准号: IRT0625)和吉林省科技发展计划(批准号: 20060511)资助.

摘要:

采用两步反应制备了新型锂离子电池正极材料Li0.86V0.8O2. 该材料具有六方层状结构, 空间群为R3m. 研究了在水热条件下溶液的碱度对于钒酸锂盐形成的影响, 在低碱度的条件下, 前驱体V2O3和LiOH·H2O并未发生反应, 只有在碱度达到2.5 mol/L时, 才能形成单相的Li0.86V0.8O2材料. X射线光电子能谱分析发现, V2p的结合能位于516.4 和523.1 eV, 分别对应于四价钒离子的V2p3/2 和V2p1/2, 这说明在Li0.86V0.8O2中V离子主要价位为+4价. 在电流密度为7.4 mA/g的充放电中, Li0.86V0.8O2初始充电容量达到163 mA·h/g, 首次放电容量也能达到113 mA·h/g, 20次循环后放电容量仍然可以达到80 mA·h/g, 表现出较好的循环性能.

关键词: 锂离子电池; 正极材料; 水热合成法; Li0.86V0.8O2; X射线光电子能谱

Abstract:

The new cathode material Li0.86V0.8O2 was synthesized by two-steps reaction. The material crystallizes in the layered rhombohedral structure with space group R3m. The mechanism of phase evolution was studied in different alkalinity under hydrothermal condition. It is found that the hydrothermal reaction does not work in low LiOH·H2O concentration. The single phase material of Li0.86V0.8O2 can only be obtained in the concentration of 2.5 mol/L. Through X-ray photoemission spectrum, the binding of 516.4 and 523.1 eV can be attributed to the V2p3/24+ and V2p1/24+, which confirm the quadrivalent state of V ion in Li0.86V0.8O2. With a current density of 7.4 mA/g, the charge capacity of Li0.86V0.8O2 is 163 mA·h/g in the first cycle, and the first discharge capacity of the materials is 113 mA·h/g. After 20th cycles, the discharge capacity is still 80 mA·h/g, which shows good electrochemicalstability.

Key words: Li-ion battery; Cathode material; Hydrothermal synthesis method; Li0.86V0.8O2; X-ray photoemission spectrum

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