Research & Development

Study on aluminum-doped lithium-rich manganese-based cathode materials of Li1.2Ni0.2Mn0.6O2

  • Wei Zhou ,
  • Yanxiao Chen ,
  • Xiaodong Guo ,
  • Wei Xiang
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  • 1. Sichuan University,Chengdu 610065,China
    2. Chengdu University of Technology

Received date: 2020-07-21

  Online published: 2021-07-08

Abstract

In order to solve the inherent problems of poor cycling stability and serious cycling voltage attenuation of cobalt-free Mn-based lithium-rich materials of Li1.2Ni0.2Mn0.6O2,the effect of aluminum doping combined with solid phase calcination method on the micromorphology,structure and electrochemical properties of the material were studied in this paper.The resu-lts showed that the aluminum doping not only made the surface morphology of the material denser,but also brought a more stable crystal structure to the material,which was conducive to the resistance of the material to a series of adverse factors caused by the structural reversion in the long charge-discharge cycle,and finally led to its more excellent electrochemical per-formance.In addition,when the doping amount of aluminum was 1%,the discharge specific capacity,cycle stability and volt-age retention of the material at high rate all achieved the best optimization performance.The discharge specific capacity of the first cycle at 0.1C ratio was as high as 248.8 mA·h/g in the voltage range of 2.0~4.8 V.After 200 cycles of charging and dis-charging,the discharge specific capacity retention rate increased from 57.9% to 77.6%,and the cycle voltage retention rate also increased from 84.2% to 85.6%.The above results fully showed that 1% aluminum doping had excellent improvement effect on Mn-based lithium-rich materials of Li1.2Ni0.2Mn0.6O2.

Cite this article

Wei Zhou , Yanxiao Chen , Xiaodong Guo , Wei Xiang . Study on aluminum-doped lithium-rich manganese-based cathode materials of Li1.2Ni0.2Mn0.6O2[J]. Inorganic Chemicals Industry, 2021 , 53(6) : 128 -133 . DOI: 10.19964/j.issn.1006-4990.2020-0415

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