熔盐法合成LiMn1/3Ni1/3Co1/3O2及AA电池的电化学性能

来源期刊：有色金属科学与工程2011年第1期

论文作者：钟盛文 封志芳 谢敏

文章页码：9 - 13

关键词：锂离子电池；正极材料；熔盐法；Li(Mn_1/3Ni_1/3Co_1/3)O₂

Key words：Lithium-ion batteries; Cathode material; Melting salt method; Li(Mn_1/3Ni_1/3Co_1/3)O₂

摘    要：以KCl为熔盐，采用熔盐法合成了锂离子电池正极材料LiMn_1/3Ni_1/3Co_1/3O₂，扫描电子显微镜(SEM)显示此方法制备产物具有较好的晶形，颗粒较均匀．XRD表征结果显示产物为层状结构，充放电测试结果显示出材料在3.6 V平台附近有较大的可逆容量．在900℃时保温8h时合成的LiMn_1/3Ni_1/3Co_1/3O₂具有较好的电化学性能，制作成AA电池，在2.75～4.2 V之间进行充放电测试，在1 C倍率下放电，LiMn_1/3Ni_1/3Co_1/3O₂的初始放电容量可达132.9 mAh/g，循环50多次后容量仍为124.6 mAh/g，容量保持率为93.75%．

Abstract:

The LiMn_1/3Ni_1/3Co_1/3O₂ of lithium-ion batteries cathode materials were prepared by molten salt synthesis method, in which KCl was molten salt, and the LiMn_1/3Ni_1/3Co_1/3O₂ has satisfactory electrochemical performance.Scanning Electron Eicroscope (SEM) shows that the product is in uniform and particles in even. XRD results demonstrate that the as-synthesized LiMn_1/3Ni_1/3Co_1/3O₂ is layered structure. The charge and discharge test results show the sample has a 3.6V plateau and higher reversible capacity. The LiMn_1/3Ni_1/3Co_1/3O₂ cathode synthesized at the temperature of 900℃. AA tape of lithium-ion batteries are made with good electrochemical performance. Its initial specific discharge capacity was 132.9mAh/g (2.75～4.2V,1C rate) of better cycle stability. The discharge capacity was 124.6mAh/g after 50 cycles. The rate of discharge capacity was 93.75% .