Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第5期    总第62期    2004年5月

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文章编号:1004-0609(2004)05-0871-06
LiMn2L(Ac)2热分解制备的尖晶石LiMn2O4
其电化学性能
唐新村1, 杨幼平1, 李立清2, 贾殿赠3, 黄可龙1

( 1. 中南大学 化学化工学院, 长沙 410083; 
2. 湖南大学 环境科学与工程系,长沙 410082;
3. 新疆大学 应用化学研究所, 乌鲁木齐 830046
)

摘 要: 通过XRD、 SEM及电化学测试等手段研究了前驱体LiMn2L(Ac)2(L为柠檬酸根)的焙烧工艺条件对尖晶石LiMn2O4产物的结构、形貌及电化学性能的影响。 结果表明: 提高前驱体的焙烧温度有利于获得晶相结构、 微观形貌及电化学性能均较好的LiMn2O4样品。 在500℃焙烧2h再于750℃下保温8~16h的分段焙烧工艺所得样品的初始容量达到126.0mAh/g, 循环50次后容量衰减了14.5%。 

 

关键字: 尖晶石LiMn2O4;低热固相反应; 锂离子电池; 晶胞参数

Preparation of spinel LiMn2O4 by thermo-decomposition of 
LiMn2L(Ac)2 and its electrochemical properties
TANG Xin-cun1, YANG You-ping1, LI Li-qing2
JIA Dian-zeng3, HUANG Ke-long1

1. College of Chemistry and Chemical Engineering,
 Central South University,Changsha 410083, China;
2. Department of Environmental Science and Engineering, 
Hunan University,Changsha 410082, China;
3. Institute of Applied Chemistry, Xinjiang University, Wulumuqi 830046, China

Abstract: The effects of thermo-decomposing process of LiMn2L(Ac)2 on the structures, micromorphologies and electrochemical properties of the LiMn2O4 product were studied by XRD, SEM and charge/discharge tests. The results suggest that the LiMn2O4 samples, which were obtained at the higher sintering temperature, exhibit the more perfect crystal structure, more regular micromorphology and better electrochemical properties. When the sintering temperature is higher than 750℃, the subsect-heating technology should be used to avoid the Li2MnO3 impurities. The LiMn2O4 sample prepared by sintering the precursor first at 500℃ for 2h and then at 750℃ for 8-16h has the first capacity of 126.0mAh/g, and the capacity fading 14.5% after 50 cycles.

 

Key words: spinel LiMn2O4; low-heating solid-state reaction; Li-ion batteries; lattice parameter

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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