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_1.2Mn_0.6Ni_0.2O₂. 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., electr

SUBMITTER: Li Q 

PROVIDER: S-EPMC8891320 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature