Preparation and Characterization of LiMn1.8Co0.2O3.95F0.05 by the Combustion-assisted Soft Route

武汉理工大学学报-材料科学版(英文版), 2006, 21(2): 41-43.

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1.College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China

2.College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China

3.College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China

4.College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China

5.College of Metallurgical Science and Engineering, Central South University,Changsha 410083, China

基金项目: The Natural Science Foundation of Hunan Province(04JJ40038) 湖南省教育厅资助项目(05C140)

Preparation and Characterization of LiMn1.8Co0.2O3.95F0.05 by the Combustion-assisted Soft Route

Keywords： lithium ion

LiMn1.8Co0.2O3.95F0.05 powder was prepared by heating the ignited LiMn1.8Co0.2O3.95F0.05 precursor gel using lithium acetate, magnesium acetate, cobalt acetate, lithium fluoride, citric acid and glycol as raw materials. The influence of the calcination temperature on the structural and electrochemical properties of LiMn1.8Co0.2O3.95F0.05 was investigated by X-ray diffraction, scanning electron microscopy, and galvanostatic charge-discharge experiments. The powders prepared under different conditions are of good crystallinity. The discharge capacity of LiMn1.8Co0.2O3.95F0.05 powder increased from 92 mAh/g to 105mAh/g as the calcination temperature increased from 750 ℃ to 850 ℃. The capacity of LiMn1.8Co0.2O3.95F0.05 heated at 750 ℃, 800 ℃, 850 ℃ for 4 hours remained at 95.2%, 97%, 94.2%, respectively, after being cycled 20 times, suggesting that the multiple substitution of Co and F for Mn and O results in a good cycling behavior.

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材料期刊网

Preparation and Characterization of LiMn1.8Co0.2O3.95F0.05 by the Combustion-assisted Soft Route

参考文献