High-capacity lithium- and manganese-rich cathodes play a critical role in the development of the advanced Li-ion batteries. However, the severe capacity fading and voltage decay impede their commercial applications. Herein, the vacancy-enriched Li_1·2Ni_0·13Co_0·13Mn_0·54O₂ cathodes with spinel/defective structure shell are realized by the gas-solid reactions (GSR) and the followed Li–Nb–O coating shell coated Li_1·2Ni_0·13Co_0·13Mn_0·54O₂ cathodes are achieved by a liquid coating process (LCP). The dual-shell modified Li_1·2Ni_0·13Co_0·13Mn_0·54O₂ cathodes can deliver 219.5 mAh·g⁻¹ at 250 mA g⁻¹ and corresponding to 96.44% capacity retentions after 100 cycles over 2.0–4.6 V, far higher than those (212.3 mAh·g⁻¹ and 83.09%) of the pristine Li_1·2Ni_0·13Co_0·13Mn_0·54O₂ cathode material. Even at 1250 mA g⁻¹, the capacity retentions also improve from 50.68% to 95.92% after 100 cycles. The enhanced electrochemical performances are mainly ascribed to the enhanced structural stability and the suppressed harmful side-reactions/transition metal dissolutions. The construction of the dual shells provides an effective method to optimize the interfacial structure of Li- and Mn-rich cathode material and other cathode materials.

高容量的富含锂和锰的阴极在高级锂离子电池的开发中起着至关重要的作用。然而，严重的容量衰减和电压衰减阻碍了它们的商业应用。在此，通过气固反应（GSR）和随后的Li–Nb–O实现了具有尖晶石/缺陷结构壳的富空位Li _1·2 Ni _0·13 Co _0·13 Mn _0·54 O ₂阴极镀壳Li _1·2 Ni _0·13 Co _0·13 Mn _0·54 O ₂阴极是通过液相涂覆法（LCP）实现的。双壳修饰Li _1·2 Ni _0·13 Co_0·13的Mn _0·54个ö ₂阴极可以提供219.5毫安·克^-1在250mA克^-1后100次循环以上2.0-4.6 V和对应于96.44％的容量保持率，比（212.3毫安·克高得多^-原始Li _1·2 Ni _0·13 Co _0·13 Mn _0·54 O ₂正极材料的¹和83.09％。即使在1250 mA g ^-1，经过100个循环后，容量保留率也从50.68％提高到95.92％。增强的电化学性能主要归因于增强的结构稳定性和抑制的有害副反应/过渡金属溶解。双壳的构造提供了一种有效的方法，可以优化富含锂和锰的正极材料和其他正极材料的界面结构。