Research & Development

Study on preparation and electrochemical properties of nano-sized LiNi0.05Mn1.95O4 cathode materials

  • QIAN Zhihui ,
  • ZHU Qin ,
  • MA Jiao ,
  • GUO Yujiao ,
  • XIANG Mingwu ,
  • GUO Junming
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  • 1.Key Laboratory of Green-Chemistry Materials in University of Yunnan Province,School of Chemistry and Environment,Yunnan Minzu University,Kunming 650500,China
    2.Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China

Received date: 2023-06-08

  Online published: 2024-04-18

Abstract

To effectively suppress Jahn-Teller effect of spinel lithium manganate and improve the problem of rapid capacity decay during high-rate charge discharge cycles,the LiNi0.05Mn1.95O4 samples were successfully prepared by using a molten salt combustion method and different calcination temperatures.The experiment results demonstrated that the crystal structure of LiMn2O4 did not change under Ni-doping and different calcination temperatures.With the rise of calcination temperature,the crystallinity and particle size of the samples were increased continuously.Besides,the particle sizes were gradually increased from nanoscales to submicron scales.The optimal calcination temperature of 650 ℃ delivered excellent electrochemical performance.The initial discharge specific capacity at 5C and the capacity retention rate after 500 cycles were 100.8 mA·h/g and 80.0%,respectively.At a higher rate of 10C,the capacity of 500 cycles only attenuated by 7.5%.The dynamic performance test results indicated that it had a large lithium-ion diffusion coefficient of 3.26×10-16 cm2/s and a smaller apparent activation energy of 25.67 kJ/mol.Ni doping and different calcination temperatures inhibited the Jahn-Teller effect of LiMn2O4 materials,thereby promoted the rate performance and cycle life of LiMn2O4 materials.

Cite this article

QIAN Zhihui , ZHU Qin , MA Jiao , GUO Yujiao , XIANG Mingwu , GUO Junming . Study on preparation and electrochemical properties of nano-sized LiNi0.05Mn1.95O4 cathode materials[J]. Inorganic Chemicals Industry, 2024 , 56(4) : 50 -56 . DOI: 10.19964/j.issn.1006-4990.2023-0313

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