Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (12): 2574.doi: 10.7503/cjcu20190346

• Physical Chemistry • Previous Articles     Next Articles

Synthesis and Electrochemical Properties of Spinel Lithium Manganese Cathode Material LiNi0.01Co0.03Mn1.96O4

Yuzhen DUAN,Jinyu ZHU,Junming GUO(),Mingwu XIANG(),Xiaofang LIU,Hongli BAI,Changwei SU   

  1. School of Chemistry and Enviroment, National and Local Joint Engineering Research Center for Green Preparation Technology of Bio-based Materials, Key Laboratory of Green Chemical Materials in Universities of Yunnan Province, Yunnan Minzu University, Kunming 650500, China
  • Received:2019-06-19 Online:2019-12-04 Published:2019-12-04
  • Contact: Junming GUO,Mingwu XIANG E-mail:guojunming@tsinghua.org.cn;xmwbboy@163.com
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(U1602273);the National Natural Science Foundation of China(51972282)

Abstract:

Ni-Co co-doped LiNi0.01Co0.03Mn1.96O4(LNCMO) cathode material with a polyhedral morphology was prepared via a solid-state combustion method. Results show that the LNCMO sample has excellent rate performance and long cycling stability, it delivers the initial discharge capacity of 110.6 and 102.3 mA·h/g with capacity retention rate of 75.7% and 78.3% after 1000 cycles at 1C and 5C at 25 ℃, respectively. At high current rate of 10C and 20C, the capacity retention rates of 78.8% and 54.2% are obtained after 1000 cycles, respectively. Even at 1C under high temperature of 55 ℃, the capacity retention rate of 76.6% is also maintained after 1000 cycles. The LNCMO sample shows larger Li + ion diffusion coefficient(4.77×10 -11 cm 2/s) and lower apparent activation energy(23.37 kJ/mol) compared to the Co-doped sample.

Key words: Ni-Co co-doping, Spinel LiMn2O4, Solid-state combustion method, Lithium ion battery

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