With the increasing demand for high-energy–density energy storage devices, lithium metal batteries have rekindled the interest of researchers due to ultra-high specific capacity. However, the extremely unstable interfaces between the electrolyte and electrodes limit its application seriously. Herein, we introduce an organosilicon compound, 1,3-Divinyltetramethyldisiloxane (DTMDS), as multifunctional electrolyte additive to enhance the performance of LiNi_0.5Mn_1.5O₄/Li batteries. DTMDS contains two functional groups: siloxane groups (Si-O) and unsaturated carbon-carbon double bonds (CC). Siloxane groups can capture hydrogen fluoride (HF) in electrolyte, and the carbon-carbon double bonds can form thin and dense passivation layer on both cathode and anode surfaces by polymerization. As a result, the capacity retention of the batteries can retain more than 95% after 500 cycles. This work provides a valuable reference for the design of multifunctional additives and stabilizing the interfaces of high-voltage lithium metal batteries.

随着对高能量密度储能设备的需求不断增加，锂金属电池因其超高的比容量而重新引起了研究人员的兴趣。然而，电解质和电极之间的极其不稳定的界面严重限制了其应用。在这里，我们引入有机硅化合物1,3-二乙烯基四甲基二硅氧烷（DTMDS）作为多功能电解质添加剂，以增强LiNi _0.5 Mn _1.5 O ₄ / Li电池的性能。DTMDS包含两个官能团：硅氧烷基（Si-O）和不饱和碳-碳双键（CC）。硅氧烷基团可以捕获电解质中的氟化氢（HF），并且碳-碳双键可以通过聚合作用在阴极和阳极表面上形成薄而致密的钝化层。结果，在500次循环后，电池的容量保持率可以保持95％以上。这项工作为多功能添加剂的设计和稳定高压锂金属电池的界面提供了有价值的参考。