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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