Open AccessA Polymer-in-Salt Electrolyte Enables Room Temperature Lithium Metal Batteries
Author(s) -
jingbing Xie,
Hongli Xu,
Qingrong Wang,
Ruohong Ke,
Bing Han,
Jian Chang,
Jun Wang,
Yonghong Deng
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac6830
Subject(s) - electrolyte , ionic conductivity , lithium (medication) , conductivity , battery (electricity) , materials science , salt (chemistry) , polymer , electrode , chemical engineering , lithium metal , ionic bonding , chemistry , ion , composite material , organic chemistry , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
The lithium metal battery with solid-state polymer electrolyte (SPE) is a promising candidate for solid-state batteries with high safety and high energy density. However, the low room temperature ionic conductivity and poor electrolyte/electrode interfacial stability of the SPEs seriously hinder the practical application. Herein, we adopt a polymer-in-salt electrolyte (PISE) strategy on the comb-like polycaprolactone (PCL) to circumvent the low ionic conductivity and poor interfacial stability of the conventional SPE, thus enabling the fully function of room temperature lithium metal batteries. The all-solid-state PISE exhibits a high ionic conductivity of 3.9×10-4 S cm-1 at 30°C, a superior lithium-ion transference number of 0.61 and an improved oxidative stability of ~4.8 V vs Li/Li+. Due to the ultra-stable interface generated by the superconcentrated lithium salt, the all-solid-state LiFePO4||Li cells exhibit prominent high cycling stability, with high capacity retention (92%) after 300 cycles at ambient temperature. The fully function of the ambient temperature PISE offers a promising pathway towards high energy density and high safety room temperature LMBs.