博士生易红玲论文"Decoupling ambient air-induced degradation mechanism of LiNiO2 during short-time storage"被Journal of Energy Chemistry接收发表
发布时间：2025-11-11
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LiNiO2 (LNO) is a compelling high‐capacity and cost‐effective cathode for lithium‐ion batteries, yet its pronounced air sensitivity remains a key obstacle to practical deployment. Here, we elucidate the distinct roles of H2O and CO2 in governing surface chemistry and degradation pathways of LNO under controlled atmospheres. CO2 promotes the formation of petal‐like Li2CO3, whereas H2O generates LiOH, triggering Ni3+ reduction and lattice distortion. Their coexistence induces a synergistic effect that accelerates LiOH conversion and Li2CO3/LiHCO3 accumulation, culminating in irreversible structural deterioration. Notably, the Li2CO3 layer derived from CO2 exposure evolves into a robust, fluorine‐rich cathode-electrolyte interphase (CEI) during initial cycling, substantially stabilizing the interface and improving performance. A 20-minute CO2 treatment yields a discharge capacity of 186.1 mAh g-1 at 5C, outperforming the pristine electrode (172.2 mAh g-1). These findings deliver mechanistic clarity on gas-solid reactions in Ni-rich cathodes, highlight the dualistic effects of atmospheric species, and provide a blueprint for designing air‐tolerant, high‐rate Ni‐rich materials.