富锂尖晶石锂锰氧化物的电化学性能  

STUDIES ON THE ELECTROCHEMICAL PERFORMANCES OF Li-RICH SPINEL LITHIUM MANGANESE OXIDES

作　　者：童庆松[1] 杨勇[2] 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 [2]厦门大学固体表面物理化学国家重点实验室,福建厦门361005

出　　处：《矿物学报》2005年第4期399-404,共6页Acta Mineralogica Sinica

基　　金：教育部重点项目(03065;JA02159;福建省自然科学基金(E0510014)

摘　　要：以LiOH·H2O和Mn(CH3COO)2·2H2O为原料,通过微波烧结和固相烧结的两段烧结法合成了锂离子电池正极材料Li3.22Na0.569Mn5.78O12尖晶石.研究表明,在380 ℃的固相烧结温度下,微波处理有利于生成纯尖晶石相.在2.5～4.5V电压区间,样品的初始放电容量高于132 mAh/g.在充放电过程中,40循环的放电容量几乎不衰减.微波烧结使该样品的Mn-O键被加强,晶格结构在充放电过程中保持稳定.By using LiOH· H2O and Mn （ CH3 COO）2· 2H2O as the stamnaterials, the Li3.22 Na0.569 M-n5.78O12 positive materials were prepared by a two-phase sintering method consisting of microwave sintering and solid-state sintering processes. Experimental results showedthat the pure Li3.22Na0.569Mn5.78O12.0 spinel phase can be obtained by microwave sintering and solid state sintering at 380 ℃. The sample exhibited an initial capacity of 132 mAh/g and its capacity fade was rather low in 40 cycles in the voltage range of 4.5 to 2.5 V. The Mn-O bend in the sample strengthened by microwave sintering process and its structure kpt stable in charge-discharge tests.

关 键 词：Li4Mn5O12 微波 可充性 

分 类 号：O646[理学—物理化学] P579[理学—化学]