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

Journal Article · · Nature Communications
ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [5];  [3];  [3];  [6]; ORCiD logo [6]; ORCiD logo [7]
  1. University of Chinese Academy of Sciences, Shenzhan(China)
  2. Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin (Germany); Chinese Academy of Sciences (CAS), Shenzhen (China)
  3. Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin (Germany)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  5. Fuzhou University (China)
  6. University of Chinese Academy of Sciences, Shanghai (China)
  7. University of Chinese Academy of Sciences, Beijing (China)

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., Li1.2Mn0.6Ni0.2O2. In particular, we tune the Coulombic repulsive interactions to obtain an adaptable crystal structure that enables the reversible distortion of TMO6 octahedron and mitigates TM dissolution and migration. Moreover, this strategy hinders the irreversible release of oxygen and other parasitic reactions (e.g., electrolyte decomposition) commonly occurring at high voltages. When tested in non-aqueous coin cell configuration, the modified Li-rich cathode material, combined with a Li metal anode, enables a stable cell discharge capacity of about 240 mAh g-1 for 120 cycles at 50 mA g-1 and a slower voltage decay compared to the unmodified Li1.2Mn0.6Ni0.2O2.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Chinese Academy of Sciences; National Natural Science Foundation of China (NSFC); Central Universities
Grant/Contract Number:
AC05-00OR22725; 211211KYSB20170060; 11975238; 11575192; ZDKYYQ20170001; XDB28000000
OSTI ID:
1903918
Journal Information:
Nature Communications, Vol. 13, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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