Building a Robust and Conductive Solid Electrolyte Interphase on Li-Metal Anode for High-Performance Li-Metal Batteries

Abstract

For the first time, trimethylsilyl azide (C3H9N3Si, hereinafter denoted as TSA) is used as an efficient additive in a fluoroethylene carbonate (FEC)-based carbonate electrolyte solution. Along with an LiF-rich compound, the addition of 0.1 M TSA to the FEC-based electrolyte induces a conductive Li3N-rich solid–electrolyte interphase layer on the Li-metal surface and allows the formation of a dense Li-deposit morphology, suppressing the dendritic growth of Li and improving the Li+ ionic conductivity. In a practical Li-metal battery using a 2 mol% Al-doped full-concentration gradient Li[Ni0.75Co0.10Mn0.15]O2 (Al2-FCG75) cathode, the TSA additive greatly improves the cycling stability and rate capability, even under practical operating conditions.1. S.-J. Park, J.-Y. Hwang and Y.-K. Sun,J. Mater. Chem. A, 2019, 7, 13441-13448.2. S.-J. Park, J.-Y. Hwang, C. S. Yoon, H.-G. Jung and Y.-K. Sun, ACS Appl. Mater. Interfaces, 2018, 10, 17985.