Multifunctional organosilicon compound contributes to stable operation of high-voltage lithium metal batteries

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 LiNi0.5Mn1.5O4/Li batteries. DTMDS contains two functional groups: siloxane groups (Si-O) and unsaturated carbon-carbon double bonds (C@C). 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. (C) 2021 Elsevier Inc. All rights reserved.

Automated summary

This study introduces an organosilicon compound DTMDS as an electrolyte additive to enhance the performance of lithium metal batteries. The functional groups of siloxane and carbon-carbon double bonds can stabilize the battery performance and prolong its cycle life, providing valuable design references.