Al掺杂尖晶石LiMn2O4正极材料的性能

王永龙; 王文阁; 张倩; 王昕; 曹建胜; 叶世海?

doi:10.61558/2993-074X.2954

电化学 >

2013 , Vol. 19 >Issue 3: 232 - 236

DOI: https://doi.org/10.61558/2993-074X.2954

锂离子和燃料电池近期研究专辑（厦门大学董全峰教授主编）

Al掺杂尖晶石LiMn₂O₄正极材料的性能

王永龙 ,
王文阁 ,
张倩 ,
王昕 ,
曹建胜 ,
叶世海?

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南开大学新能源材料化学研究所，天津 300071

收稿日期: 2012-10-12

修回日期: 2013-01-16

网络出版日期: 2013-01-21

基金资助

国家自然科学基金项目（No. 21273119）资助

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Electrochemical Performance of Al-Doped Spinel LiMn₂O₄ Cathode Material for Li-ion Batteries

WANG Yong-Long ,
WANG Wen-Ge ,
ZHANG Qian ,
WANG Xin ,
CAO Jian-Sheng ,
YE Shi-Hai

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Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China

Received date: 2012-10-12

Revised date: 2013-01-16

Online published: 2013-01-21

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摘要

尖晶石LiMn₂O₄作为锂离子电池正极可大电流放电，且成本低、环境友好. 采用溶胶-凝胶法制备尖晶石LiMn₂O₄及Al掺杂材料. 使用X-射线衍射（XRD）和扫描电子显微镜（SEM）观察材料结构与形貌. 结果表明，复合材料颗粒尺寸300 ~ 500 nm，呈类球形. 电化学恒流充放电测试表明，Al掺杂尖晶石LiMn₂O₄电极的循环性明显提高，Al掺杂5%LiMn₂O₄（by mass，下同）正极在1C倍率充放电100周期循环后的容量保持率为98.2%，1C倍率充电、5C倍率放电下，100周期循环后其容量保持率为99.0%，表现出较优的电化学循环性能.

关键词：

锂离子电池; 正极; 尖晶石结构; Al掺杂; 循环性能

本文引用格式

王永龙 , 王文阁 , 张倩 , 王昕 , 曹建胜 , 叶世海? . Al掺杂尖晶石LiMn₂O₄正极材料的性能[J]. 电化学, 2013 , 19(3) : 232 -236 . DOI: 10.61558/2993-074X.2954

Abstract

Spinel LiMn₂O₄, a cathode material for Li-ion batteries, is featured as good high-rate performance, low cost and environmental friendly. The pristine and Al-doped LiMn₂O₄ samples were prepared by sol-gel method. The structure and micromorphology of the as-prepared samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results demonstrated that the as-prepared LiMn₂O₄ samples had a typical cubic spinel structure and were composed of sphere-like particles with a diameter range of 300 ~ 500 nm. Galvanostatic charge-discharge tests showed that the LiMn₂O₄ samples doped with Al element exhibited an enhanced cycling performance. Especially, in the case of LiMn₂O₄ with 5% Al-doped, the discharge capacity retention was about 98.2% at the rate of 1C discharge and was 99% at the rate of 5C discharge, based on the same charge rate of 1C.

Key words：

Li-ion batteries; cathode; spinel structure; Al-doping; cycling performance

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