Kirkendall effect-induced uniform stress distribution stabilizes nickel-rich layered oxide cathodes.

ABSTRACT: Nickel-rich layered oxide cathodes promise ultrahigh energy density but is plagued by the mechanical failure of the secondary particle upon (de)lithiation. Existing approaches for alleviating the structural degradation could retard pulverization, yet fail to tune the stress distribution and root out the formation of cracks. Herein, we report a unique strategy to uniformize the stress distribution in secondary particle via Kirkendall effect to stabilize the core region during electrochemical cycling. Exotic metal/metalloid oxides (such as Al₂O₃ or SiO₂) is introduced as the heterogeneous nucleation seeds for the preferential growth of the precursor. The calcination treatment afterwards generates a dopant-rich interior structure with central Kirkendall void,

SUBMITTER: Gao Z 

PROVIDER: S-EPMC10876981 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature