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Localized Water‐In‐Salt Electrolyte for Aqueous Lithium‐Ion Batteries
Author(s) -
Jaumaux Pauline,
Yang Xu,
Zhang Bao,
Safaei Javad,
Tang Xiao,
Zhou Dong,
Wang Chunsheng,
Wang Guoxiu
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202107389
Subject(s) - electrolyte , lithium (medication) , chemistry , salt (chemistry) , inorganic chemistry , aqueous solution , lithium nitrate , chemical engineering , ionic bonding , ion , organic chemistry , electrode , medicine , engineering , endocrinology
Water‐in‐salt (WIS) electrolytes using super‐concentrated organic lithium (Li) salts are of interest for aqueous Li‐ion batteries. However, the high salt cost, high viscosity, poor wettability, and environmental hazards remain a great challenge. Herein, we present a localized water‐in‐salt (LWIS) electrolyte based on low‐cost lithium nitrate (LiNO 3 ) salt and 1,5‐pentanediol (PD) as inert diluent. The addition of PD maintains the solvation structure of the WIS electrolyte, improves the electrolyte stability via hydrogen‐bonding interactions with water and NO 3 − molecules, and reduces the total salt concentration. By in situ gelling the LWIS electrolyte with tetraethylene glycol diacrylate (TEGDA) monomer, the electrolyte stability window can be further expanded to 3.0 V. The as‐developed Mo 6 S 8 |LWIS gel electrolyte|LiMn 2 O 4 (LMO) batteries delivered outstanding cycling performance with an average Coulombic efficiency of 98.53 % after 250 cycles at 1 C.