Affiliation:
1. Shanghai Key Laboratory of Materials Protection and Advanced Materials Electric Power Shanghai Engineering Research Center of Energy‐Saving in Heat Exchange Systems Shanghai University of Electric Power Shanghai 200090 P. R. China
2. Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 P. R. China
Abstract
AbstractUnstable solid electrolyte interface (SEI) and dendrite growth hinder the development of rechargeable lithium‐metal batteries (LMBs) at low temperature (≤−20 °C). In this work, regulating the concentration of Li salt increases the proportion of anions in Li+ solvation structure, thereby forming a denser SEI on Li anode. The optimized solvation structure exhibits fast charge transfer kinetics and high‐voltage (dis)charge performance. As a result, Li||Cu cells with modified electrolyte work over 400 h and maintaining an average coulombic efficiency of 98.05%, the Li||LiNi0.8Co0.1Mn0.1O2 cells (N/P = 3) are capable of one hundred stable cycles with a capacity retention of 93.7% even at −40 °C. These findings confirm the effect of ion‐pairing and anion‐derived SEI on the long‐term cycling of LMBs, contributing a promising solution to the development of low‐temperature LMBs.
Funder
National Natural Science Foundation of China
Science and Technology Commission of Shanghai Municipality
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials