Lithium cobalt oxide (LCO) is dominant in consumer electronics cathodes for high energy density and mature processes, but high‐voltage mixed redox reactions cause lattice oxygen release, electrolyte decomposition, and phase transitions, leading to capacity decay and safety issues like structural/thermal instability. Taking advantage of vanadium‐based glass's characteristics, including fluidity at low temperatures and good wettability with most materials, and based on the adjustability of its structure and composition, a vanadium‐based glass (VPFL, 6V 2 O 5 ‐3Li 3 PO 4 ‐3LiF) coating composite LCO (VPFL@LCO) cathode material was prepared via the liquid‐phase dispersion method and cooling crystallization, which solves this problem. About 1.0 wt% VPFL reduces LCO's high‐temperature mass loss by 14.0%, enhancing thermal stability. Its tunable composition forms a dense, uniform fluorine‐doped protective layer, shielding electrodes from electrolyte/moisture/air to suppress surface degradation. The chemical bond (Co 3+ ‐O‐V 4+ ) at the composite coating interface between LCO and VPFL, combined with the high electrical conductivity of the glass, can facilitate ion transport, thereby achieving better rate capability and cyclability. VPFL@LCO delivers 210.6 mAh g −1 charge capacity at 1 C under 4.65 V, retaining 84.0% capacity after 200 cycles. Under the same conditions, this performance is significantly superior to that of bare LCO, which only provides a charge capacity of 196.3 mAh g −1 and a capacity retention of 53.5%. This work offers a referential strategy for stable, long‐cycle lithium‐ion battery cathodes.
Wang et al. (Mon,) studied this question.
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