用研磨微电极研究LiMn2O4的循环伏安行为

无机材料学报

用研磨微电极研究LiMn₂O₄的循环伏安行为

周豪杰, 吕东生, 许梦清, 李伟善

华南师范大学化学系, 广州 510631

收稿日期:2004-11-17 修回日期:2005-03-02 出版日期:2006-01-20 网络出版日期:2006-01-20

Voltammetric Behavior of Powder LiMn₂O₄ on Abrasive Microelectrode

ZHOU Hao-Jie, LU Dong-Sheng, XU Meng-Qing, LI Wei-Shan

Department of Chemistry, South China Normal University, Guangzhou 510631, China

Received:2004-11-17 Revised:2005-03-02 Published:2006-01-20 Online:2006-01-20

摘要/Abstract

摘要： 用研磨微电极研究了尖晶石锂锰氧化物在1mol/L LiPF₆/EC+DMC+EMC(1:1:1)电解液中的循环伏安行为, 并用SEM分析了电极的表面形貌和锰元素
分布. 结果表明, 尖晶石锂锰氧化物在研磨微电极上较在粉末微电极上稳定, 嵌脱锂离子过程也更可逆. 比较发现, 固态法合成的尖晶石锂锰
氧化物的循环稳定性较溶胶-凝胶法合成的要好, 这一结果与XRD结晶度分析结果吻合, 说明研磨微电极能够快速有效地评价尖晶石锂锰氧化物
的循环稳定性及锂离子嵌脱过程的可逆性.

关键词: 研磨微电极, 循环伏安, 尖晶石锂锰氧化物

Abstract: Voltammetric behavior of spinel lithium manganese oxide on abrasive microelectrode was studied in 1mol/L LiPF₆/EC+DMC+EMC(1:1:1), and the morphology and the manganese distribution
of the abrasive microelectrode were analyzed by SEM and EDS, respectively. Results show that spinel lithium manganese oxide is more stable on abrasive
microelectrode than on powder microelectrode and has more reversibility for lithium ion extraction/intercalation.Two spinel lithium manganese oxide
samples synthesized by solid state process and sol-gel method were compared. The sample synthesized by solid state process shows its better stability for
cycling and reversibility for lithium ion extraction/intercalation. This result conforms with the difference in crystallization of two samples,
obtained by XRD. Abrasive microelectrode can be used to estimate the cyclic stability of spinel lithium manganese oxide and the reversibility
for lithium ion extraction/intercalation fast and effectively.

Key words: abrasive microelectrode, cyclic voltammetry, spinel lithium manganese oxide

中图分类号:

TM911

周豪杰,吕东生,许梦清,李伟善. 用研磨微电极研究LiMn₂O₄的循环伏安行为[J]. 无机材料学报.

ZHOU Hao-Jie,LU Dong-Sheng,XU Meng-Qing,LI Wei-Shan. Voltammetric Behavior of Powder LiMn₂O₄ on Abrasive Microelectrode[J]. Journal of Inorganic Materials.

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用研磨微电极研究LiMn₂O₄的循环伏安行为

Voltammetric Behavior of Powder LiMn₂O₄ on Abrasive Microelectrode

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