富锂正极材料的制备及电化学性能研究

魏欣; 张世超; 刘冠娆; 杨埔蘅; 孟娟; 李红磊

doi:10.13700/j.bh.1001-5965.2015.0505

富锂正极材料的制备及电化学性能研究

doi: 10.13700/j.bh.1001-5965.2015.0505

北京航空航天大学材料科学与工程学院, 北京 100083

基金项目: 北京航天航空大学博士研究生创新基金（YMF-14-YJSY-004）；国家“973”计划（2013CB934001）

详细信息

作者简介:
魏欣,女,博士研究生。主要研究方向:锂离子电池正极材料的制备及性能。Tel.:010-82339319。E-mail:xwei2015@buaa.edu.cn;张世超,男,博士,教授,博士生导师。主要研究方向:新能源材料的制备及电化学性能。Tel.:010-82339319。E-mail:csc@buaa.edu.cn

通讯作者:
张世超,Tel.:010-82339319,E-mail:csc@buaa.edu.cn

中图分类号: TM911
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出版历程
- 收稿日期: 2015-07-29
- 刊出日期: 2016-08-20

Synthesis and electrochemical performance of lithium-rich cathode material

School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

摘要

摘要: 用溶胶-凝胶法结合高温煅烧过程制备富锂正极材料Li_1.2Mn_0.54Ni_0.13Co_0.13O₂，对800℃和900℃煅烧后得到的2种材料（标记为S8和S9）进行物相和形貌表征以及电化学测试。电化学测试结果表明，样品S9具有较高的放电容量、较好的循环稳定性和较小的电荷转移电阻。样品S9在0.1 C（25 mA·g^-1）时的首次充电容量为345.0 mA·h·g^-1，首次放电容量为273.9 mA·h·g^-1，首次库伦效率为79.4%。1 C时，首次放电容量为188.1 mA·h·g^-1，循环30周后放电容量为173.3 mA·h·g^-1，容量保持率为92.1%。结果表明，尽管富锂正极材料R-3m层状结构在800℃煅烧后已经形成，但仍需要经过更高温度煅烧，以提高锂离子和过渡金属离子在各自层中的有序度，从而有效地提高材料的电化学性能。
- 锂离子电池 /
- 富锂正极材料 /
- 溶胶-凝胶法 /
- 电化学性能 /
- 煅烧温度
Abstract: Lithium-rich cathode material Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ has been synthesized by sol-gel method followed by a high-temperature calcination process at 800℃ and 900℃ (signed as S8 and S9, respectively). The structure, morphology and electrochemical properties of as-synthesized materials are characterized in detail. Electrochemical test results show that sample S9 has higher discharge capacity, better cyclic stability and smaller charge transfer resistance. Sample S9 delivers the initial charge capacity of 345.0 mA·h·g^-1 and the initial discharge capacity of 273.9 mA·h·g^-1 at 0.1C (25 mA·g^-1) with a coulombic efficiency of 79.4%. The discharge capacity is 173.3 mA·h·g^-1 at 1 C after 30 cycles, remaining 92.1% of initial discharge capacity (188.1 mA·h·g^-1). The results indicate that the ordering between lithium and transition metal cations in their respective layers needs a higher calcination temperature in spite of the formation of the R-3m layered phase at 800℃. It is helpful to effectively improve the electrochemical properties.
- lithium-ion batteries /
- lithium-rich cathode material /
- sol-gel method /
- electrochemical performance /
- calcination temperature

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