Al3+掺杂0.5Li2MnO3-0.5LiCo1/3Ni1/3Mn1/3O2正极材料的研究

doi:10.3724/SP.J.1077.2013.13114

无机材料学报 ›› 2013, Vol. 28 ›› Issue (11): 1261-1264.DOI: 10.3724/SP.J.1077.2013.13114

Al³⁺掺杂0.5Li₂MnO₃-0.5LiCo_1/3Ni_1/3Mn_1/3O₂正极材料的研究

张文华^{1, 2}, 何巍², 裴锋¹, 伍发元¹, 毛荣军¹, 艾新平², 杨汉西², 曹余良²

(1. 江西省电力科学研究院, 南昌 330096; 2. 武汉大学化学与分子科学学院, 武汉 430072)

收稿日期:2013-03-04 修回日期:2013-06-17 出版日期:2013-11-20 网络出版日期:2013-10-18
作者简介:张文华(1983-), 女, 博士. E-mail: zhangwenhua_610@163.com
基金资助:
国家电网公司课题资助; 国家973计划(2009CB220103)

Improved Electrochemical Properties of Al³⁺-doped 0.5Li₂MnO₃-0.5LiCo_1/3Ni_1/3Mn_1/3O₂ Cathode for Lithium Ion Batteries

ZHANG Wen-Hua^1,2, HE Wei², PEI Feng¹, WU Fa-Yuan¹, MAO Rong-Jun¹, AI Xin-Ping², YANG Han-Xi², CAO Yu-Liang²

(1. JiangXi Electric Power Research Institute, Nanchang 330096, China; 2. College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China)

Received:2013-03-04 Revised:2013-06-17 Published:2013-11-20 Online:2013-10-18
About author:ZHANG Wen-Hua. E-mail: zhangwenhua_610@163.com
Supported by:
Independent Research Project of State Grid Corporation of China; National Basic Research Program of China (2009CB220103)

摘要/Abstract

摘要： 采用聚合热解法制备了掺入3% Al³⁺的富锂锰基Li[Li_0.2Co_0.13Ni_0.13Mn_0.51Al_0.03]O₂材料, 经过X射线衍射(XRD)、扫描电镜(SEM)实验表明, 掺入3%Al³⁺样品仍然保持层状结构, 没有观察到杂质相的存在。在2.0~4.8 V范围内进行恒流充放电测试表明, 掺Al³⁺样品在30 mA/g的电流密度下, 首周充放电比容量可达349.1和303.8 mAh/g(首次库仑效率87%); 在100 mA/g的电流密度下, 100次循环后, 容量保持率为91.7%, 显示出高的循环稳定性。这些结果表明掺杂Al³⁺能够在一定程度上提高富锂氧化物材料层状结构的稳定性, 为发展高容量和高稳定性正极材料提供一种新途径。

关键词: 锂离子电池, Li₂MnO₃-LiMO₂, Al³⁺ 掺杂, 正极材料

Abstract: The lithium-rich cathode materials Li[Li_0.2Co_0.13Ni_0.13Mn_0.51Al_0.03]O₂ doped with 3% Al³⁺ were synthesized by a polymer-pyrolysis method. The structure and morphology of the as-prepared material were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM). The structural analyses exhibit that the Al³⁺-doped sample maintains the layered structure of the Li-rich oxide material and no impurity is detected in XRD patterns. The charge-discharge tests show that the Al³⁺-doped sample has a high charge/discharge capacity of 349.1/303.8 mAh/g (initial coulombic efficiency of 87%) at current density of 30 mA/g. Additionally, Al³⁺-doped sample also exhibits excellent cyclability with 91.7% capacity retention over 100 cycles. The results demonstrate that Al³⁺ doping is favorable to maintain the structural stability of the layered structure during the electrochemical lithium insertion/extraction, so as to provide a promising route to develop cathode materials with high capacity and stability.

Key words: lithium ion battery, Li₂MnO₃-LMO₂, Al³⁺ doping, cathode material

中图分类号:

张文华, 何巍, 裴锋, 伍发元, 毛荣军, 艾新平, 杨汉西, 曹余良. Al³⁺掺杂0.5Li₂MnO₃-0.5LiCo_1/3Ni_1/3Mn_1/3O₂正极材料的研究[J]. 无机材料学报, 2013, 28(11): 1261-1264.

ZHANG Wen-Hua, HE Wei, PEI Feng, WU Fa-Yuan, MAO Rong-Jun, AI Xin-Ping, YANG Han-Xi, CAO Yu-Liang. Improved Electrochemical Properties of Al³⁺-doped 0.5Li₂MnO₃-0.5LiCo_1/3Ni_1/3Mn_1/3O₂ Cathode for Lithium Ion Batteries[J]. Journal of Inorganic Materials, 2013, 28(11): 1261-1264.

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Al³⁺掺杂0.5Li₂MnO₃-0.5LiCo_1/3Ni_1/3Mn_1/3O₂正极材料的研究

Improved Electrochemical Properties of Al³⁺-doped 0.5Li₂MnO₃-0.5LiCo_1/3Ni_1/3Mn_1/3O₂ Cathode for Lithium Ion Batteries

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