| 固相反应法制备α-LiAlO2包覆LiNi0.4Co0.2Mn0.4O2的电化学性能研究 |
| Electrochemical Properties of α-LiAlO2 Coated LiNi0.4Co0.2Mn0.4O2 by Solid Reaction |
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| 摘要: 以提高锂离子电池正极材料LiNi0.4Co0.2Mn0.4O2的循环性能为目的,以LiNO3和Al(OH)3为原料,采用固相反应法制备了α-LiAlO2包覆LiNi0.4Co0.2Mn0.4O2正极材料。微观组织结构分析结果表明,包覆热处理后LiNi0.4Co0.2Mn0.4O2颗粒表面形成了一层不均匀絮状包覆物α-LiAlO2。电化学测试表明,α-LiAlO2包覆处理有效减缓了充放电循环过程中总阻抗的增加,改善了材料的循环性能。3wt%LiAlO2包覆的正极材料在室温1C充放电循环100次后,平均每次衰减率由包覆前的0.19%下降到0.14%。 |
| 关键词: LiNi0.4Co0.2Mn0.4O2 锂离子电池 正极材料 包覆 LiAlO2 |
| 基金项目: 浙江省科技计划资助项目(No.2007C21100) |
| Abstract: Commercial cathode material,LiNi0.4Co0.2Mn0.4O2,has been coated with α-LiAlO2 by solid reaction to improve the cycling properties.Microstructure analyses show a flocculent layer of α-LiAlO2 formed on the surface of LiNi0.4Co0.2Mn0.4O2 particles after baking with the mixture of LiNO3 and Al(OH)3.Electrochemical tests indicate an effective improvement of the cycling performance of the material by α-LiAlO2 coating.The room temperature cycling at 1C shows that the capacity fading rate decreases from 0.19% per cycle to 0.14% per cycle after the cathode material is coated with 3wt% LiAlO2. |
| Keywords: LiNi0.4Co0.2Mn0.4O2 lithium ion batteries cathode materials coating LiAlO2 |
| 投稿时间：2007-11-06 修订日期：2007-12-22 |
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| 张进,曹高劭,赵新兵,涂江平.固相反应法制备α-LiAlO2包覆LiNi0.4Co0.2Mn0.4O2的电化学性能研究[J].无机化学学报,2008,24(3):415-421. |
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