Fabricating Heterostructures for Boosting the Structure Stability of Li-Rich Cathodes.

ABSTRACT: Li-rich Mn-based oxides are regarded as the most promising new-generation cathode materials, but their practical application is greatly hindered by structure collapse and capacity degradation. Herein, a rock salt phase is epitaxially constructed on the surface of Li-rich Mn-based cathodes through Mo doping to improve their structural stability. The heterogeneous structure composed of a rock salt phase and layered phase is induced by Mo⁶⁺ enriched on the particle surface, and the strong Mo-O bonding can enhance the TM-O covalence. Therefore, it can stabilize lattice oxygen and inhibit the side reaction of the interface and structural phase transition. The discharge capacity of 2% Mo-doped samples (Mo 2%) displays 279.67 mA h g^-1 at 0.1 C (vs 254.39 mA h g^-1 (pristine)), and the discharge capacity retention rate of Mo 2% is 79.4% after 300 cycles at 5 C (vs 47.6% (pristine)).

SUBMITTER: Li Y 

PROVIDER: S-EPMC9948178 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature