Metastability and Reversibility of Anionic Redox-Based Cathode for High-Energy Rechargeable Batteries.

ABSTRACT: Great focus has recently been placed on anionic redox, to which high capacities of Li-rich layered oxides are attributed. With almost doubled capacity compared with state-of-the-art cathode materials, Li-rich layered oxides still fall short in other performance metrics. Among these, voltage decay upon cycling remains the most hindering obstacle, in which defect electrochemistry plays a critical role. Here, we reveal that the metastable state of cycled Li-rich layered oxide, which stems from structural defects in different dimensions, is responsible for the voltage decay. More importantly, through mild thermal energy, the metastable state can be driven to a stable state, bringing about structural and voltage recovery. However, for the classic layered oxide without reversible anionic redox,

SUBMITTER: Qiu B 

PROVIDER: S-EPMC7919000 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature