The detrimental effects on the electrochemical performances of high-capacity nickel-rich layered oxide cathode LiNi_0.8Co_0.1Mn_0.1O₂ (Ni-rich NCM) are continuous irreversible phase transition, particle disintegration, and unstable cathode-electrolyte interface, which are usually induced by deleterious cathode-electrolyte reactions. Here, we report those side reactions are limited by a uniform inorganic/polymer cathode-electrolyte-interface (CEI) formed by in-situ electrochemical oxidation of a trace amount of dual additives in the traditional carbonate-based electrolytes. This CEI film not only eliminates the adverse cathode-electrolyte interface reaction and prevents the electrolyte penetration into the grain boundary but also hinders the formation of inactive rock-salt phase on the material surface. More significantly, it is demonstrated that this N, B, O-rich interface layer offers a fast Li⁺ diffusion kinetic process to ensure a high-rate performance of the cathode, which is still a technical difficulty for the large application of Ni-rich NCM. Here, under the synergistic effect of dual additives containing lithium bis(oxalate)borate (LiBOB) and dopamine, the cell exhibits high-capacity retention over 92% after 200 cycles at 1 C, and also obtain a high specific capacity of 118 mA h g⁻¹ at the high rate of 20 C. Building a stable and effect Li⁺-ion conductive interface film by optimizing the electrolyte formula is a facial and effective approach to develop aggressive high-capacity cathodes for high-energy storage applications.

对高容量富镍层状氧化物正极 LiNi _0.8 Co _0.1 Mn _0.1 O ₂电化学性能的不利影响（富镍 NCM）是连续的不可逆相变、粒子解体和不稳定的阴极 - 电解质界面，通常由有害的阴极 - 电解质反应引起。在这里，我们报告了这些副反应受到由传统碳酸盐基电解质中痕量双添加剂的原位电化学氧化形成的均匀无机/聚合物阴极电解质界面（CEI）的限制。这种CEI膜不仅消除了不利的阴极-电解质界面反应，防止电解质渗透到晶界，而且阻碍了材料表面非活性岩盐相的形成。更重要的是，证明这种富含 N、B、O 的界面层提供了快速的 Li ⁺扩散动力学过程以确保正极的高倍率性能，这仍然是富镍 NCM 大规模应用的技术难点。在这里，在含有双(草酸)硼酸锂 (LiBOB) 和多巴胺的双重添加剂的协同作用下，电池在 1 C 下循环 200 次后具有超过 92% 的高容量保持率，并获得了 118 mA h g 的高比容量^-1在 20 C 的高倍率下。通过优化电解质配方构建稳定有效的 Li ⁺离子导电界面膜是开发用于高能量存储应用的积极高容量正极的一种有效方法。