Patching Solid Electrolyte Interphase via Modulating Anion Decomposition Reactions for Stable Lithium Metal Batteries
Abstract
Abstract Solid electrolyte interphase (SEI) on lithium (Li) metal anodes undergoes repeated rupture and patching during cycles, which induces the formation of inactive Li and the rapid failure of Li metal batteries. The inactive Li compounds used to patch SEI dominate inactive Li for highly reversible Li metal anodes. Herein, patching SEI rapidly by modulating decomposition reactions of bis(fluorosulfonyl)imide anion (FSI − ) in the electrolyte is proposed to decrease the amount of inactive Li compounds. Increasing overpotential of anodes can promote the fast and complete decomposition reactions of FSI − , which increases the amount of insoluble inorganic components in the decomposition products of one FSI − . Abundant insoluble inorganic components can build SEI efficiently to avoid the further decomposition of the electrolyte. Then, a protocol is proposed to increase overpotential of anodes by applying a high current density within a short time during the final stage of Li deposition in Li metal batteries. With the proposed protocol, the amount of inactive Li compounds decreases by 62.2%. Furthermore, a prototype pouch cell of 411 Wh kg −1 achieves 202 stable cycles. This work provides a fresh understanding of SEI formation and inspires a new strategy to stabilize SEI.
Article Details
Authors (12)
Jia‐Lin Li
School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 P.R. China
Xue‐Qiang Zhang
School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 P.R. China
Pei‐Ping Yu
Institute of Functional Nano and Soft Materials Jiangsu Key Laboratory for Carbon‐based Functional Materials and Devices Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University Suzhou 215006 P.R. China
Shu‐Yu Sun
Beijing Key Laboratory of Complex Solid State Batteries Department of Chemical Engineering Tsinghua University Beijing 100084 P.R. China
Lin‐Kun Yang
School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 P.R. China
Ya‐Nan Wang
School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 P.R. China
Zhao Zheng
Beijing Key Laboratory of Complex Solid State Batteries & Tsinghua Center for Green Chemical Engineering Electrification, Department of Chemical Engineering
Xue‐Yi Yan
School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 P.R. China
Wen‐Jun Feng
Beijing Key Laboratory of Complex Solid State Batteries Department of Chemical Engineering Tsinghua University Beijing 100084 P.R. China
Xiaoru Chen
Research Institute of Tsinghua University Shenzhen 518057 P.R. China
Tao Cheng
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Jiangsu Key Laboratory of Advanced Negative Carbon Technologies
Jia‐Qi Huang
School of Interdisciplinary Science Beijing Institute of Technology Beijing P. R. China