Highly Stable Lithium Metal Batteries Enabled by Regulating the Solvation of Lithium Ions in Nonaqueous Electrolytes

Angewandte Chemie
Xue-Qiang ZhangQiang Zhang

Abstract

Safe and rechargeable lithium metal batteries have been difficult to achieve because of the formation of lithium dendrites. Herein an emerging electrolyte based on a simple solvation strategy is proposed for highly stable lithium metal anodes in both coin and pouch cells. Fluoroethylene carbonate (FEC) and lithium nitrate (LiNO3 ) were concurrently introduced into an electrolyte, thus altering the solvation sheath of lithium ions, and forming a uniform solid electrolyte interphase (SEI), with an abundance of LiF and LiNx Oy on a working lithium metal anode with dendrite-free lithium deposition. Ultrahigh Coulombic efficiency (99.96 %) and long lifespans (1000 cycles) were achieved when the FEC/LiNO3 electrolyte was applied in working batteries. The solvation chemistry of electrolyte was further explored by molecular dynamics simulations and first-principles calculations. This work provides insight into understanding the critical role of the solvation of lithium ions in forming the SEI and delivering an effective route to optimize electrolytes for safe lithium metal batteries.

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Citations

Jun 28, 2018·Angewandte Chemie·Quan PangLinda F Nazar
Sep 11, 2018·Angewandte Chemie·Xinyue ZhangJiayan Luo
Jul 31, 2019·Chemical Communications : Chem Comm·Yanpeng GuoHuiqiao Li
Aug 6, 2019·Advanced Materials·Peng ShiQiang Zhang
Jan 29, 2019·Angewandte Chemie·Huicong YangFeng Li
May 20, 2020·Angewandte Chemie·Li-Peng HouQiang Zhang
May 20, 2020·Angewandte Chemie·Dong-Joo YooJang Wook Choi
Aug 26, 2020·Angewandte Chemie·Jiale FuChunsheng Wang
Jul 9, 2020·Angewandte Chemie·Chi-Cheung SuKhalil Amine

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