| Al2O3膜表面包覆LiNi1/3Co1/3Mn1/3O2的微观结构和电化学特性 |
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| 引用本文： | 李新禄,康飞宇,白新德,沈万慈.Al2O3膜表面包覆LiNi1/3Co1/3Mn1/3O2的微观结构和电化学特性[J].无机材料学报,2007,22(6):1037-1040. |
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| 作者姓名： | 李新禄 康飞宇 白新德 沈万慈 |
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| 作者单位： | 清华大学,材料系,北京,100084 |
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| 摘 要： | 采用液相浸渍法在球形颗粒LiNi1／3Co1／2Mn1／3O2的表面包覆上了一层Al2O3膜．结构分析表明，表面A1203膜的厚度约100nm，具有一定的无定形结构，核体材料具有纯六方相结构．实验结果证明，表面Al2O3膜能够有效提高正极材料的耐过充能力和循环稳定性．在截止电压为3．0—4．5V，充放电倍率为1C的条件下，Al2O3表面包覆膜后正极活性物质50次循环的容量保持率提高了11．5％．
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| 关 键 词： | 正极材料 表面包覆 锂离子电池 Al2O3膜 |
| 文章编号： | 1000-324X（2007）06-1037-04 |
| 收稿时间： | 2006-10-27 |
| 修稿时间： | 2006-10-27 |
Microstructure and Electrochemical Properties of LiNi1/3Co1/3Mn1/3O2 Coated with Al2O3 Film |
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| LI Xin-Lu,KANG Fei-Yu,BAI Xin-De,SHEN Wan-Ci.Microstructure and Electrochemical Properties of LiNi1/3Co1/3Mn1/3O2 Coated with Al2O3 Film[J].Journal of Inorganic Materials,2007,22(6):1037-1040. |
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| Authors: | LI Xin-Lu KANG Fei-Yu BAI Xin-De SHEN Wan-Ci |
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| Affiliation: | Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | LiNi1/3Co1/3Mn1/3O2 is considered as a new-generation cathode material for lithium ion batteries. Al2O3 film was coated on the surface of LiNi1/3Co1/3Mn1/3O2 in order to prevent irreversible reactions between cathode and electrolytes. The structure analysis indicates that the Al2O3 film is amorphous with thickness of about 100nm, the core material has a hexagonal structure. The experiment results show that Al2O3 coating is effective to improve overcharge capability and cycle stability. The capacity retention of the coated LiNi1/3Co1/3Mn1/3O2 is increased by 11.5% compared with that of a blank sample after 50 charge-discharge cycles at the cutoff voltage of 3.0-4.5V and 1C rate. |
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| Keywords: | cathode materials surface coating lithium ion batteries Al2O3 film |
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