Improved Electrochemical Properties of Al3+-doped 0.5Li2MnO3-0.5LiCo1/3Ni1/3Mn1/3O2 Cathode for Lithium Ion Batteries

doi:10.3724/SP.J.1077.2013.13114

Journal of Inorganic Materials ›› 2013, Vol. 28 ›› Issue (11): 1261-1264.DOI: 10.3724/SP.J.1077.2013.13114

• Research Paper • Previous Articles Next Articles

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)

Abstract

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

CLC Number:

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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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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