Get access
Advertisement

A New Spinel-Layered Li-Rich Microsphere as a High-Rate Cathode Material for Li-Ion Batteries

Authors

  • Dong Luo,

    1. Key Lab of Optoelectronic Materials, Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, P. R. China
    Search for more papers by this author
  • Guangshe Li,

    1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, P. R. China
    Search for more papers by this author
  • Chaochao Fu,

    1. Key Lab of Optoelectronic Materials, Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, P. R. China
    Search for more papers by this author
  • Jing Zheng,

    1. Key Lab of Optoelectronic Materials, Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, P. R. China
    Search for more papers by this author
  • Jianming Fan,

    1. Key Lab of Optoelectronic Materials, Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, P. R. China
    Search for more papers by this author
  • Qi Li,

    1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, P. R. China
    Search for more papers by this author
  • Liping Li

    Corresponding author
    1. Key Lab of Optoelectronic Materials, Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, P. R. China
    Search for more papers by this author

Abstract

Li-rich layered materials are considered to be the promising low-cost cathodes for lithium-ion batteries but they suffer from poor rate capability despite of efforts toward surface coating or foreign dopings. Here, spinel-layered Li-rich Li-Mn-Co-O microspheres are reported as a new high-rate cathode material for Li-ion batteries. The synthetic procedure is relatively simple, involving the formation of uniform carbonate precursor under solvothermal conditions and its subsequent transformation to an assembled microsphere that integrates a spinel-like component with a layered component by a heat treatment. When calcined at 700 °C, the amount of transition metal Mn and Co in the Li-Mn-Co-O microspheres maintained is similar to at 800 °C, while the structures of constituent particles partially transform from 2D to 3D channels. As a consequence, when tested as a cathode for lithium-ion batteries, the spinel-layered Li-rich Li-Mn-Co-O microspheres obtained at 700 °C show a maximum discharge capacity of 185.1 mA h g−1 at a very high current density of 1200 mA g−1 between 2.0 and 4.6 V. Such a capacity is among the highest reported to date at high charge-discharge rates. Therefore, the present spinel-layered Li-rich Li-Mn-Co-O microspheres represent an attractive alternative to high-rate electrode materials for lithium-ion batteries.

Get access to the full text of this article

Ancillary