固相反应法制备α-LiAlO_2包覆LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2的电化学性能研究  

Electrochemical Properties of α-LiAlO_2 Coated LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2 by Solid Reaction

作　　者：张进[1] 曹高劭[1] 赵新兵[1] 涂江平[1] 

机构地区：[1]浙江大学材料系,杭州310027

出　　处：《无机化学学报》2008年第3期415-421,共7页Chinese Journal of Inorganic Chemistry

基　　金：浙江省科技计划资助项目(No.2007C21100)

摘　　要：以提高锂离子电池正极材料LiNi_0.4Co_0.2Mn_0.4O_2的循环性能为目的,以LiNO_3和Al(OH)_3为原料,采用固相反应法制备了α-LiAlO2包覆LiNi_0.4Co_0.2Mn_0.4O_2正极材料。微观组织结构分析结果表明,包覆热处理后LiNi_0.4Co_0.2Mn_0.4O_2颗粒表面形成了一层不均匀絮状包覆物α-LiAlO_2。电化学测试表明,α-LiAlO_2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%LiAlO_2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%。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.

关 键 词：LiNi0.4Co0.2Mn0.4O2 锂离子电池 正极材料 包覆 LiAlO2 

分 类 号：O614.111[理学—无机化学] O614.31[理学—化学]