Li1+xCoyMn2-x-yO4的结构及电化学性能研究

无机材料学报, 2002, 17(5): 999-1003.

Li_1+xCo_yMn_2-x-yO₄的结构及电化学性能研究

郑子山 , 唐子龙 , 张中太 , 沈万慈

1.1.清华大学材料系新型陶瓷与精细工艺国家重点实验室, 北京100084

　2. 福建省漳州师范学院化学系, 漳州 363000

State Key Laboratory of New Ceramics and Fine Processing

Tsinghua University

China

Zhangzhou Teachers, Zhangzhou 363000, China

关键词：锂离子电池 , LiMn₂O₄ , cation doping , IR spectroscopy

Structural Characteristics and Electrochemical Properties of Co-doped Spinel Li_1+xCo_yMn_2-x-yO₄ for Lithium-ion Batteries

ZHENG Zi-Shan , TANG Zi-Long , ZHANG Zhong-Tai , SHEN Wan-Ci

Keywords： lithium-ion batteries , LiMn₂O₄ , 掺杂钴 , 红外光谱

利用溶液相合成技术把钴掺入到主尖晶石相中制得掺钴尖晶石相材料.所合成的材料具有颗粒分布均匀及结晶性能好等特点.利用X射线粉末衍射仪、傅里叶变换红外分光光度计及扫描电子显微镜对所合成掺杂锂材料的结构性能进行表征.研究表明掺杂钴可提高材料的结构稳定性能,减少锰在电解液中溶解,减少锂离子在材料中迁移电阻.电化学性能测试结果表明所合成掺钴材料Li_1.03Co_0.05Mn_1.92O₄具有较好的初始容量及循环稳定性能.

Cobalt was doped into the host spinel to produce cobalt-doped spinel material by a solution technique. The
end Co-doped materials have many advantages of narrowly distributed and well crystallized particles and small surface area. The determination of XRD patterns
shows that the peaks shift towards high angle and become sharp as the introduction of cobalt. The analysis of infrared (IR) spectroscopy illustrates that cobalt
doping can enhance the strength of Mn--O bonds and improve the structural stability of the materials. The presence of cobalt reduces the dissolution of
Mn into the electrolyte according to the investigation of ICP analysis results since Co-doped materials have more stable structure and smaller surface area.
Cobalt doping can enhance the bond Mn--O and weaken the bond Li--O in the spinel. As the result, the Li⁺ ion has easier diffusion in the spinel and the Co-doped
material has smaller charge-transfer resistant (R_ct). The measurement of electorchemical properties shows that the Co-doped material Li₁.₀₃Co_0.05Mn_1.92O₄
prepared in this technique has good cycling performance and high initial capacity.

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