Electrolyte-assisted low-voltage decomposition of Li 2 C 2 O 4 for efficient cathode pre-lithiation in lithium-ion batteries.

Lithium oxalate (Li 2 C 2 O 4 ) is an attractive cathode pre-lithiation additive for lithium-ion batteries (LIBs), but its application is hindered by its high decomposition potential (>4.7 V). Due to the liquid-solid synergistic effect of the NaNO 2 additive and the LiNi 0.83 Co 0.07 Mn 0.1 O 2 (NCM) cathode material, the decomposition efficiency of micro-Li 2 C 2 O 4 reaches 100% at a low charge cutoff voltage of 4.3 V. Our work boosts the widespread practical application of Li 2 C 2 O 4 by a simple and promising electrolyte-assisted cathode pre-lithiation strategy.