Electrochemical performance of LiMn2O4/LiFePO4 blend cathodes for lithium ion batteries

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• 作者：Chengguang Qiu (1)
  Lina Liu (3)
  Fei Du (1)
  Xu Yang (1)
  Chunzhong Wang (1) (2)
  Gang Chen (1) (2)
  Yingjin Wei (1)
  
  1. Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) ; College of Physics ; 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
  2. State Key Laboratory of Superhard Materials ; Jilin University ; Changchun ; 130012 ; P. R. China
  
• 关键词：Lithium ion battery ; LiMn2O4 ; LiFePO4 ; Blend cathode
• 刊名：Chemical Research in Chinese Universities
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：31
• 期：2
• 页码：270-275
• 全文大小：1,074 KB
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• 刊物主题：Chemistry/Food Science, general; Analytical Chemistry; Inorganic Chemistry; Organic Chemistry; Physical Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：2210-3171

文摘

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 LiMn2O4 particles 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.