Electrochemical Performance of LiMn2O4/LiFePO4 Blend Cathodes for Lithium Ion Batteries

doi:10.1007/s40242-015-4367-0

Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (2): 270-275.doi: 10.1007/s40242-015-4367-0

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Electrochemical Performance of LiMn₂O₄/LiFePO₄ Blend Cathodes for Lithium Ion Batteries

QIU Chengguang¹, LIU Lina³, DU Fei¹, YANG Xu¹, WANG Chunzhong^1,2, CHEN Gang^1,2, WEI Yingjin¹

1. Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education), College of Physics, Jilin University, Changchun 130012, P. R. China;
2. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P. R. China;
3. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, P. R. China

Received:2014-09-29 Revised:2014-11-12 Online:2015-04-01 Published:2014-12-15
Contact: WANG Chunzhong E-mail:wcz@jlu.edu.cn
Supported by:
Supported by the State Key Development Program for Basic Research of China(No.2015CB251103), the National Natural Science Foundation of China(Nos.51272088, 20473075) and the Research Fund for High Technology Development of Jilin Pro- vince, China(No.20120310).

Abstract

Abstract:

A series of LiMn₂O₄/LiFePO₄ blend cathodes was prepared by hand milling and ball milling in order to compensate the disadvantage of spinel LiMn₂O₄ and olivine LiFePO₄. The morphologies of the blends were studied by scanning electron microscopy, and their electrochemical properties were studied by charge-discharge cycling, cyclic voltammetry and electrochemical impedance spectroscopy. It is easy to obtain uniform LiMn₂O₄/LiFePO₄ blends by the hand milling technique, while significant particle agglomeration is caused by the ball milling technique. When the LiMn₂O₄:LiFePO₄ mass ratio is 1:1, the nano-sized LiFePO₄ powders not only uniformly cover the micron-sized LiMn₂O₄particles but also effectively fill in the cavities of the LiMn₂O₄ space. Such morphology offers a good electrical contact and a high tap density, which leads to a high discharge capacity and good cycle stability.

Key words: Lithium ion battery, LiMn₂O₄, LiFePO₄, Blend cathode

QIU Chengguang, LIU Lina, DU Fei, YANG Xu, WANG Chunzhong, CHEN Gang, WEI Yingjin. Electrochemical Performance of LiMn₂O₄/LiFePO₄ Blend Cathodes for Lithium Ion Batteries[J]. Chemical Research in Chinese Universities, 2015, 31(2): 270-275.

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Electrochemical Performance of LiMn₂O₄/LiFePO₄ Blend Cathodes for Lithium Ion Batteries

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