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

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.