The lithium (Li) metal battery (LMB) is one of the most promising candidates for next‐generation energy storage systems. However, it is still a significant challenge to operate LMBs with high voltage cathodes under high rate conditions. In this work, an LMB using a nickel‐rich layered cathode of LiNi_0.76Mn_0.14Co_0.10O₂ (NMC76) and an optimized electrolyte [0.6 m lithium bis(trifluoromethanesulfonyl)imide + 0.4 m lithium bis(oxalato)borate + 0.05 m LiPF₆ dissolved in ethylene carbonate and ethyl methyl carbonate (4:6 by weight)] demonstrates excellent stability at a high charge cutoff voltage of 4.5 V. Remarkably, these Li||NMC76 cells can deliver a high discharge capacity of >220 mA h g⁻¹ (846 W h kg⁻¹) and retain more than 80% capacity after 1000 cycles at high charge/discharge current rates of 2C/2C (1C = 200 mA g⁻¹). This excellent electrochemical performance can be attributed to the greatly enhanced structural/interfacial stability of both the Ni‐rich NMC76 cathode material and the Li metal anode using the optimized electrolyte.

中文翻译：

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稳定的电极/电解质相实现富镍NMC阴极的高压操作

锂（Li）金属电池（LMB）是下一代储能系统最有希望的候选者之一。然而，在高速率条件下使用高压阴极运行LMB仍然是一个巨大的挑战。在这项工作中，一个LMB使用的是LiNi _0.76 Mn _0.14 Co _0.10 O ₂（NMC76）的富镍层状阴极和优化的电解质[0.6 m双（三氟甲磺酰基）酰亚胺锂+ 0.4 m双（草酸硼酸）锂+ 0.05 m LiPF ₆溶解在碳酸亚乙酯和碳酸甲乙酯中（重量比为4：6）]在4.5 V的高充电​​截止电压下表现出出色的稳定性。值得注意的是，这些Li || NMC76电池可提供> 220 mA hg ^-1的高放电容量（846 W h kg ^-1）和1000次循环后在2C / 2C（1C = 200 mA g ^-1）的高充电/放电电流速率下保持80％以上的容量。优异的电化学性能归因于使用优化电解质的富镍NMC76正极材料和锂金属负极的结构/界面稳定性大大提高。