The Ni-rich cathodes used for lithium-ion batteries (LIBs) suffer from severe surface side reactions, slow kinetics, and microcracks during long-term cycling. To address these problems, a dual-modified protective coating consisting of LiFeO₂&Fe₂O₃ layers (denoted as LFO) was fabricated on the surface of the cathode material LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) by capturing the lithium impurities in the electrolyte solution using an electric field. The LiFeO₂ layer acts as an ionic conductor, accelerating interfacial Li⁺ transport, and exhibits a synergistic effect with the bulk material during the charging/discharging process. The Fe₂O₃ layer, which contains abundant oxygen vacancies, acts as an electrostatic shielding layer and effectively inhibits the outward migration of O^α− (α < 2), thus improving the structural stability. Hence, the interface-protected NCM@LFO3 cathode showed excellent cycling stability (capacity retention of 82.4% after 600 cycles at 1 C) and even at a high cut-off voltage of 4.5 V (capacity retention of 88.9 % after 200 cycles at 1 C).

用于锂离子电池 (LIB) 的富镍阴极在长期循环过程中会出现严重的表面副反应、缓慢的动力学和微裂纹。为了解决这些问题，通过捕获锂杂质，在正极材料 LiNi _0.8 Co _0.1 Mn _0.1 O ₂ ( NCM811) 表面制备了由 LiFeO ₂ &Fe ₂ O ₃层组成的双改性保护涂层（表示为 LFO）在使用电场的电解质溶液中。LiFeO ₂层充当离子导体，加速界面 Li ⁺运输，并在充电/放电过程中与散装材料表现出协同效应。含有丰富氧空位的Fe ₂ O _{3层作为静电屏蔽层，有效抑制O} ^α- (α < 2)的向外迁移，从而提高结构稳定性。因此，界面保护的 NCM@LFO3 正极表现出优异的循环稳定性（在 1 C 下循环 600 次后容量保持率为 82.4%），甚至在 4.5 V 的高截止电压下（在 1 C 下循环 200 次后容量保持率为 88.9%） C）。