Improving the oxygen redox reversibility of Li-rich battery cathode materials via Coulombic repulsive interactions strategy

Abstract The oxygen redox reaction in lithium-rich layered oxide battery cathode materials generates extra capacity at high cell voltages (i.e., >4.5 V). However, the irreversible oxygen release causes transition metal (TM) dissolution, migration and cell voltage decay. To circumvent these issues, we introduce a strategy for tuning the Coulombic interactions in a model Li-rich positive electrode active material, i.e., Li 1.2 Mn 0.6 Ni 0.2 O 2 . In particular, we tune the Coulombic repulsive interactions to obtain an adaptable crystal structure that enables the reversible distortion of TMO 6 octahedron and mitigates TM dissolution and migration. Moreover, this strategy hinders the irreversible release of…

• UD
  U.S. Department of Energy
• NN
  National Natural Science Foundation of China

  Awards: 11575192, XDB28000000, 11975238 and 11575192, 11975238
• CA
  Chinese Academy of Sciences

  Awards: ZDKYYQ20170001, 211211KYSB20170060, XDB28000000
• PU
  Peking University
• UO
  University of Chinese Academy of Sciences

  Awards: ZDKYYQ20170001, XDB28000000
• OO
  Office of Science
• FR
  Fundamental Research Funds for the Central Universities

  Award: XDB28000000
• BE
  Basic Energy Sciences