Severe Ni dissolution and the resulting impedance rise for the single-crystal LiNi_0.8Co_0.1Mn_0.1O₂ cathode is the main challenge greatly hindering its industrial applications. Herein, we propose a novel concept of anchoring interfacial nickel cations on a single-crystal LiNi_0.8Co_0.1Mn_0.1O₂ cathode through controllable electron transfer. This strategy is realized by applying an ultrathin PMMA surface layer. Different from traditional physical coatings, electron transfer from Ni²⁺ to the ester group is confirmed, which contributes to anchoring the interfacial Ni cations and effectively inhibits Ni dissolution into the organic electrolyte. Meanwhile, Li diffusion on the cathode surface is significantly improved. As a result, the electrochemical performance of the LiNi_0.8Co_0.1Mn_0.1O₂ cathode with a PMMA layer is improved. A reversible capacity of 181.1 mAh g^–1 at 1C rate is obtained with enhanced rate capability and cycling stability. Moreover, the modified LiNi_0.8Co_0.1Mn_0.1O₂ is able to work well at high voltage and high temperature, especially with incorporation of polyvinylidene fluoride.

中文翻译：

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通过可控电子转移在单晶LiNi _0.8 Co _0.1 Mn _0.1 O ₂阴极表面上固定界面镍阳离子

Ni的严重溶解和单晶LiNi _0.8 Co _0.1 Mn _0.1 O ₂阴极的阻抗上升是主要的挑战，极大地阻碍了其工业应用。在这里，我们提出了一种通过可控的电子转移将界面镍阳离子锚定在单晶LiNi _0.8 Co _0.1 Mn _0.1 O ₂阴极上的新概念。通过应用超薄PMMA表面层可以实现此策略。与传统的物理涂层不同，Ni ^2+的电子转移证实了酯基中的N，其有助于锚定界面Ni阳离子并有效抑制Ni溶解到有机电解质中。同时，Li在阴极表面上的扩散得到显着改善。结果，具有PMMA层的LiNi _0.8 Co _0.1 Mn _0.1 O ₂阴极的电化学性能得到改善。在1 C速率下可逆容量为181.1 mAh g ^–1，具有增强的速率能力和循环稳定性。此外，改性LiNi _0.8 Co _0.1 Mn _0.1 O ₂ 能够在高压和高温下良好地工作，尤其是在引入聚偏二氟乙烯的情况下。