The difficulty of achieving fast-charging high-voltage lithium-ion batteries arises from severely unstable electrode–electrolyte interfaces with sluggish kinetics. Here we overcome this challenge by developing a “cocktail electrolyte” enabling commercial LiCoO₂ with ultra-stable fast-charging in a wide-temperature range. Unlike commercial carbonate electrolytes, our electrolyte synergistically contributes to fast ion transport and robust electrode/electrolyte interphases, which suppresses interfacial side reactions, accelerates interfacial reaction kinetics on the cathode side, and prevents Li-dendrites on anodes even at extremely high-rates (3C and 5C). Consequently, the Li||LiCoO₂ coin cell displays ultra-high stability both at a fast-charging rate (5C, 73.2% retention after 1000 cycles) and under extreme conditions (−20 and 45 °C), far beyond the state-of-the-art electrolytes. Moreover, we show the practical and general applicability of our electrolyte through the stable operation of a graphite||LiCoO₂ pouch cell (72.1% retention after 2000 cycles) and other advanced high-Ni or Co-free cathodes. This work proposes deep insights and a practical strategy for high-energy-density and fast-charging batteries.

中文翻译：

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调节电极/电解质界面化学可实现商用 LiCoO2 的 4.6 V 超稳定快速充电

实现高压锂离子电池快速充电的困难在于电极-电解质界面严重不稳定且动力学缓慢。在这里，我们通过开发一种“鸡尾酒电解质”来克服这一挑战，使商用 LiCoO ₂能够在宽温度范围内实现超稳定的快速充电。与商业碳酸盐电解质不同，我们的电解质协同促进快速离子传输和强大的电极/电解质界面，抑制界面副反应，加速阴极侧的界面反应动力学，并防止阳极上的锂枝晶，即使在极高的倍率下（3C和5C）。因此，Li||LiCoO ₂纽扣电池在快速充电速率（5C，1000 次循环后保持率为 73.2%）和极端条件（-20 和 45 °C）下均表现出超高稳定性，远远超出了国家标准。最先进的电解质。此外，我们通过石墨||LiCoO ₂软包电池（2000次循环后保持率为72.1%）和其他先进的高镍或无钴阴极的稳定运行，展示了我们的电解质的实际和普遍适用性。这项工作为高能量密度和快速充电电池提出了深刻的见解和实用的策略。