The key to enabling long-term cycling stability of high-voltage lithium (Li) metal batteries is the development of functional electrolytes that are stable against both Li anodes and high-voltage (above 4 V versus Li/Li⁺) cathodes. Due to their limited oxidative stability ( <4 V), ethers have so far been excluded from being used in high-voltage batteries, in spite of their superior reductive stability against Li metal compared to conventional carbonate electrolytes. Here, we design a concentrated dual-salt/ether electrolyte that induces the formation of stable interfacial layers on both a high-voltage LiNi_1/3Mn_1/3Co_1/3O₂ cathode and the Li metal anode, thus realizing a capacity retention of >90% over 300 cycles and ~80% over 500 cycles with a charge cut-off voltage of 4.3 V. This study offers a promising approach to enable ether-based electrolytes for high-voltage Li metal battery applications.

使高压锂（Li）金属电池具有长期循环稳定性的关键是开发对锂阳极和高压（相对于Li / Li ⁺高于4 V ）都稳定的功能性电解质。由于其有限的氧化稳定性（<4 V），尽管与传统的碳酸盐电解质相比，它们对锂金属具有优异的还原稳定性，但迄今为止，其仍被排除在高压电池中。在这里，我们设计了一种浓缩的双盐/醚电解质，该电解质可诱导在高压LiNi _1/3 Mn _1/3 Co _1/3 O ₂上形成稳定的界面层 阴极和锂金属阳极，从而在300 V的循环中实现了> 90％的容量保持率，在500 V的循环中实现了约80％的容量保持率，此充电截止电压为4.3V。高压锂金属电池的应用。