尖晶石型LiMn1.9Al0.1O3.95F0.05材料的制备及其增强的倍率性能

doi:10.13208/j.electrochem.150113

电化学（中英文） ›› 2015, Vol. 21 ›› Issue (4): 382-386. doi: 10.13208/j.electrochem.150113

尖晶石型LiMn1.9Al0.1O3.95F0.05材料的制备及其增强的倍率性能

胡俊艳，王蒙蒙，刘洪涛^*

中南大学化学化工学院，湖南长沙 410083

收稿日期:2015-01-13 修回日期:2015-03-23 出版日期:2015-08-28 发布日期:2015-08-28
通讯作者: 刘洪涛 E-mail:liuht@csu.edu.cn
基金资助:
湖南省科技计划重点项目（No. 2014FJ2007）、湖南省自然科学基金重点项目（No. 10JJ2004）及国家自然科学基金面上项目（No. 20976198）资助

Preparation and Enhanced Rate Capability of Spinel LiMn_1.9Al_0.1O_3.95F_0.05

HU Jun-yan, WANG Meng-meng, LIU Hong-tao^*

College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Received:2015-01-13 Revised:2015-03-23 Published:2015-08-28 Online:2015-08-28
Contact: LIU Hong-tao E-mail:liuht@csu.edu.cn

摘要/Abstract

摘要： 通过溶胶-凝胶和高温固相掺杂反应可控合成了形貌均匀、结晶性好的尖晶石型LiMn_1.9Al_0.1O_3.95F_0.05正极材料，探究了Al部分取代Mn、F部分取代O后对结构的影响，测试并比较了电极材料的倍率性能和循环充放电性能. 结果表明，尖晶石型LiMn_1.9Al_0.1O_3.95F_0.05和LiMn₂O₄有同样的晶型，但电极较传统的LiMn2O4电极倍率稳定性有显著提高. 在连续混合（如0.1C、0.5C和1C）充放电150次后，LiMn_1.9Al_0.1O_3.95F_0.05电极的容量仍能保持90%以上.

关键词: 尖晶石锰酸锂, 锂离子电池, 溶胶-凝胶, 倍率性能, 容量保持

Abstract: Spinel LiMn_1.9Al_0.1O_3.95F_0.05 cathode materials with good crystallinity were synthesized by a sol-gel process followed with a high-temperature solid reaction. The effects of partial substitution of Al for Mn, and F for O on the structure and the electrochemical performance were investigated. The results showed that LiMn_1.9Al_0.1O_3.95F_0.05 exhibited the same crystalline state as LiMn₂O₄, but much better electrochemical stability at higher rate cycling. As a result, LiMn_1.9Al_0.1O_3.95F_0.05 could maintain stable electrochemical lithium storage even suffering from different rate currents that retains over 90% of the initial capacity after 150 cycles at continuously varying currents (i.e. 0.1C, 0.5C, and 1C).

Key words: spinel lithium manganese oxide, lithium-ion battery, sol-gel method, rate capability, capacity retention

中图分类号:

O646

胡俊艳, 王蒙蒙, 刘洪涛. 尖晶石型LiMn1.9Al0.1O3.95F0.05材料的制备及其增强的倍率性能[J]. 电化学（中英文）, 2015, 21(4): 382-386.

HU Jun-yan, WANG Meng-meng, LIU Hong-tao. Preparation and Enhanced Rate Capability of Spinel LiMn_1.9Al_0.1O_3.95F_0.05[J]. Journal of Electrochemistry, 2015, 21(4): 382-386.

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尖晶石型LiMn1.9Al0.1O3.95F0.05材料的制备及其增强的倍率性能

Preparation and Enhanced Rate Capability of Spinel LiMn_1.9Al_0.1O_3.95F_0.05

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尖晶石型LiMn1.9Al0.1O3.95F0.05材料的制备及其增强的倍率性能

Preparation and Enhanced Rate Capability of Spinel LiMn1.9Al0.1O3.95F0.05

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Preparation and Enhanced Rate Capability of Spinel LiMn_1.9Al_0.1O_3.95F_0.05