Unveil the origin of voltage oscillation for sodium-ion batteries operating at -40 °C.

ABSTRACT: Voltage oscillation at subzero in sodium-ion batteries (SIBs) has been a common but overlooked scenario, almost yet to be understood. For example, the phenomenon seriously deteriorates the performance of Na₃V₂(PO₄)₃ (NVP) cathode in PC (propylene carbonate)/EC (ethylene carbonate)-based electrolyte at -20 °C. Here, the correlation between voltage oscillation, structural evolution, and electrolytes has been revealed based on theoretical calculations, in-/ex-situ techniques, and cross-experiments. It is found that the local phase transition of the Na₃V₂(PO₄)₃ (NVP) cathode in PC/EC-based electrolyte at -20 °C should be responsible for the oscillatory phenomenon. Furthermore, the low exchange current densi

SUBMITTER: Que L 

PROVIDER: S-EPMC11047101 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature