Li_(3.22)Na_(0.569)Mn_(5.78)O_(12.0)的电化学性能

电化学（中英文） ›› 2005, Vol. 11 ›› Issue (4): 435-439.

Li_(3.22)Na_(0.569)Mn_(5.78)O_(12.0)的电化学性能

童庆松;杨勇;连锦明;

福建师范大学化学与材料学院,厦门大学固体表面物理化学国家重点实验室,福建师范大学化学与材料学院福建福州350007,厦门大学固体表面物理化学国家重点实验室,福建厦门361005,福建厦门361005,福建福州350007

收稿日期:2005-11-28 修回日期:2005-11-28 出版日期:2005-11-28 发布日期:2005-11-28

Electrochemical Performance of Li_(3.22)Na_(0.569)Mn_(5.78)O_(12.0)

TONGQing-song~

(1,2),YANG Yong~(2),LIAN Jin-ming~(2)(1.College of Chemistry and Materials,Fujian Normal University,Fuzhou 350007,China,2.State Key Laboratory of Physical Chemistry of Solid Surface,Xiamen University,Xiamen 361005,China

Received:2005-11-28 Revised:2005-11-28 Published:2005-11-28 Online:2005-11-28

摘要/Abstract

摘要： 以L iOH.H2O和Mn(CH3COO)2.2H2O作原料,应用微波-固相两段烧结法合成具有L i4Mn5O12结构特征,组成为L i3.22Na0.569Mn5.78O12.0的锂离子电池正极材料.XRD分析表明,在380℃的后处理温度下,微波烧结前处理有利于生成纯L i4Mn5O12尖晶石相.充放电实验表明,在4.5~2.5V电压区间,新制样品的初始放电容量为132 mAh.g-1,100循环的容量衰减率为6.8%;4个月存放样的初始放电容量为122 mAh.g-1,100循环的容量衰减率为17.4%.表现出较好的充放电性能和循环寿命.微波烧结使样品的Mn-O键被加强.

关键词: Li4Mn5O12, 微波, 可充性

Abstract: By selecting LiOH·H_(2)O and Mn(CH_(3)COO)_(2)2H_(2)O as starting-materials,the positive materials with the structure characterization of Li_(4)Mn_(5)O_(12)and composition of Li_(3.22)Na_(0.569)Mn_(5.78)O_(12.0)were prepared by two-phase sintering method consisted of microwave and solid-state sintering processes.XRD patterns data showed that a pure Li_(4)Mn_(5)O_(12)phase was obtained by the fore-treatment of microwave sintering and the post-treatment of the solid-state sintering at 380℃.The charge-discharge tests showed that the newly prepared sample exhibited an initial capacity of 132 mAh·g~(-1)and its capacity faded after 100 cycles was 6.8% lower as compared with 1st cycle capacity in the voltage range of 4.5 to 2.5 V.The sample stored for 4 months exhibited an initial capacity of 122 mAh·g~(-1)and its capacity faded after 100 cycles was 17.4% lower than its 1st cycle capacity in the same voltage range.The Mn-O bond of the sample strengthened by microwave sintering process.

Key words: Li_(4)Mn_(5)O_(12), Microwave, Rechargeability

中图分类号:

O611.3

童庆松;杨勇;连锦明;. Li_(3.22)Na_(0.569)Mn_(5.78)O_(12.0)的电化学性能[J]. 电化学（中英文）, 2005, 11(4): 435-439.

TONGQing-song~. Electrochemical Performance of Li_(3.22)Na_(0.569)Mn_(5.78)O_(12.0)[J]. Journal of Electrochemistry, 2005, 11(4): 435-439.

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