Transition metal coordination to degradation products in battery electrolytes revealed by NMR and EPR spectroscopy.

ABSTRACT: The dissolution of transition metals from lithium-ion battery materials contributes to cell failure. Developing a better understanding of transition metal solvation, reactivity, and deposition will help mitigate transition metal dissolution and, thus, facilitate batteries with higher capacity and longer lifetime. In this work, Mn²⁺ and Ni²⁺ coordination in degraded LiPF₆ carbonate electrolyte solutions is examined via ¹H and ¹⁹F NMR relaxometry at ambient temperatures and pulsed (double resonance HYSCORE and ENDOR) EPR spectroscopy of the frozen solutions. Critically, the solvation spheres of transition metals in heat-degraded electrolytes are shown to differ from those found in pristine electrolytes, with significant coordinati

SUBMITTER: Allen JP 

PROVIDER: S-EPMC12569987 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature