A new route for the synthesis of LiMn2O4 cathode: Variation of composition, microstructure, and electrochemical behavior with synthesis temperature

被引:43
作者
Tsang, C [1 ]
Manthiram, A [1 ]
机构
[1] UNIV TEXAS,CTR MAT SCI & ENGN,AUSTIN,TX 78712
基金
美国国家科学基金会;
关键词
lithium manganese oxide; spinel; potassium permanganate; lithium battery;
D O I
10.1016/0167-2738(96)00350-5
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
LixMn3-xO4 (x similar to 1.08) spinel oxides have been synthesized by a new procedure. The method involves an ambient temperature synthesis of MnO2 by reducing aqueous KMnO4 with KBH4 followed by an ambient temperature insertion of Li into MnO2 and firing at various temperatures ranging from 550-900 degrees C. The oxygen content and the oxidation state of manganese decrease with increasing synthesis temperature, which results in an increase of the unit cell parameter a with synthesis temperature. The particle size increases from about 300 nm to about 1.3 mu m as the synthesis temperature increases from 550 degrees C to 900 degrees C. Preliminary electrochemical data reveal that the sample synthesized at 700 degrees C exhibits better capacity and cyclability compared to the samples obtained at 550 and 850 degrees C.
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页码:305 / 312
页数:8
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