Inspired by the metallurgical process of aluminum production, a controllable and cost-effective Al₂O₃ coating strategy is introduced to improve the surface stability of LiNi_0.8Co_0.1Mn_0.1O₂. The CO₂ is introduced to NaAlO₂ aqueous solution to generate a weak basic condition that is able to decrease the deposition rate of Al(OH)₃ and is beneficial to the uniform coating of Al(OH)₃ on the surface of commercial Ni_0.8Co_0.1Mn_0.1(OH)₂ precursor. The electrochemical performance of Al₂O₃-coated LiNi_0.8Co_0.1Mn_0.1O₂ is improved at both ordinary cutoff voltage of 4.3 V and elevated cutoff voltage of 4.5 V. With the optimized Al₂O₃ coating amount (1%), the capacity retention of the material after 60 cycles increases from 90% to 99% at 2.8–4.3 V and from 86% to 99% at 2.8–4.5 V, respectively. The Al₂O₃-coated sample also delivers a better rate capability, maintaining 117 and 131 mA h g^–1 in the voltage ranges 2.8–4.3 and 2.8 V–4.5 V at the current density of 5 C, respectively. The enhanced properties of as-prepared Al₂O₃-coated LiNi_0.8Co_0.1Mn_0.1O₂ are due to the Al₂O₃ coating layer building up a favorable interface, preventing the direct contact between the active material and electrolyte and promoting Li⁺ transmission at the interface.

中文翻译：

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冶金学上启发形成均匀的Al ₂ O ₃涂层，以改善LiNi _0.8 Co _0.1 Mn _0.1 O ₂阴极材料的电化学性能

受制铝工艺的启发，提出了一种可控且具有成本效益的Al ₂ O ₃涂层策略，以提高LiNi _0.8 Co _0.1 Mn _0.1 O ₂的表面稳定性。将CO ₂引入NaAlO ₂水溶液中以产生弱碱性条件，该碱性条件能够降低Al（OH）₃的沉积速率，并且有利于在工业Ni _0.8的表面上均匀地覆盖Al（OH）₃。Co _0.1 Mn _0.1（OH）₂前体。铝的电化学性能₂ O ₃涂层的LiNi _0.8 Co _0.1 Mn _0.1 O ₂在4.3 V的常规截止电压和4.5 V的升高截止电压下均得到改善。通过优化的Al ₂ O ₃涂层量（1％），可以保持涂层的容量。 60个循环后，材料在2.8–4.3 V时从90％增加到99％，在2.8–4.5 V时从86％增加到99％。涂有Al ₂ O ₃的样品还具有更好的倍率能力，在5 C的电流密度下，在2.8–4.3和2.8 V–4.5 V的电压范围内分别维持117和131 mA hg ^–1。制备的Al ₂ O的增强性能₃涂层LiNi _0.8 Co _0.1 Mn _0.1 O ₂是由于Al ₂ O ₃涂层建立了良好的界面，从而防止了活性物质与电解质之间的直接接触，并促进了界面处Li ^+的传输。