Elucidating and Mitigating High‐Voltage Degradation Cascades in Cobalt‐Free LiNiO2 Lithium‐Ion Battery Cathodes (Adv. Mater. 3/2022)

Abstract

Lithium-Ion Batteries In article number 2106402, Mark C. Hersam and co-workers show that lattice oxygen loss plays a critical role in the O3–O1 stacking transition in cobalt-free LiNiO2 lithium-ion battery cathodes, which subsequently induces Ni-ion migration and irreversible stacking faults, microscale electrochemical creep, cracking, and even bending of layers after high-voltage cycling. By suppressing oxygen evolution, hermetic graphene coatings arrest this degradation cascade, resulting in substantially improved high-voltage capacity retention.