Reversible multivalent carrier redox exceeding intercalation capacity boundary.

ABSTRACT: Compared with widely established monovalent-ion batteries, aqueous multivalent-ion batteries promise higher capacity release by achieving multiple electron-transfer events per ion intercalation in the host material. Despite plausibility, this high-capacity dream is untenable with the total tolerable redox charge-transfer limit of the host material for all carrier species equally, which is historically assumed to depend on the material rather than the guest carrier itself, and the kinetic hysteresis induced by larger charge/radius ratios induced kinetic hysteresis further enlarges the divide. Herein, we report that copper carrier redox in vanadium sulfide (VS₂) exceeds the intrinsic intercalation capacity boundary, with the highest capacity release as 675 mAh g^-1 at 0.

SUBMITTER: Sun Y 

PROVIDER: S-EPMC11697213 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature