微波对固相烧结锂锰氧化合物电化学性能的影响  

The effect of microwave on the electrochemical performances of Li_4Mn_5O_(12) samples synthesized by solid-state sintering method

作　　者：林素英[1] 童庆松[1] 张华香[1] 连锦明[1] 

机构地区：[1]福建师范大学化学与材料学院,福建福州350007

出　　处：《无机盐工业》2004年第6期16-18,共3页Inorganic Chemicals Industry

基　　金：教育部重点项目(03065);福建省教育厅重点项目(JA02159)。

摘　　要：以氢氧化锂和醋酸锰为原料,用微波和固相烧结相结合的方法合成了锂离子电池的阴极材料Li4Mn5O12(锂锰氧化合物)。通过充放电循环实验、FT-IR和XRD等考察了在260～830℃范围烧结时,微波对样品电化学性能及结构的影响。结果表明,在低的固相烧结温度下,微波处理有利于生成纯Li4Mn5O12晶相,在40个循环充放电中,样品的放电容量高于123mAh/g,样品的初始容量高。锂离子扩散系数随温度升高而增大,380℃是合成的适宜温度。Taking lithium hydroxide and manganese acetate as raw materials,the cathode material Li_4Mn_5O_(12) used for lithium-ion battery is synthesized by microwave and solid-state sintering method,Through the test of charge-discharge cycles,the effect of microwave on the electrochemical performance and structure of the sample at 260～830 ℃ is investigated by XRD and FTIR.The test results show that it is helpful for the formation of pure Li_4Mn_5O_(12) crystal at low sintering temperature,the discharge capacity of the sample can be over 123 mAh/g,the diffuse coefficient of Li-ion will be increased with the temperature rise,the particle size of the sample is between the scope of submicron and the optimum temperature is 380 ℃.

关 键 词：锂锰氧化合物 微波烧结 锂离子电池 

分 类 号：TQ131.11[化学工程—无机化工]