Modulating the Electrolyte Inner Solvation Structure via Low Polarity Co-solvent for Low-Temperature Aqueous Zinc-Ion Batteries

作     者：Yongchao Kang Feng Zhang Houzhen Li Wangran Wei Huitong Dong Hao Chen Yuanhua Sang Hong Liu Shuhua Wang Yongchao Kang;Feng Zhang;Houzhen Li;Wangran Wei;Huitong Dong;Hao Chen;Yuanhua Sang;Hong Liu;Shuhua Wang

作者机构：State Key Laboratory of Crystal Materials Shandong University Institute for Advanced Interdisciplinary Research (i AIR) University of Jinan 

出 版 物：《Energy & Environmental Materials》 (能源与环境材料(英文))

年 卷 期：2024年第7卷第5期

页      面：108-117页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China (Grant no. 52072224) the Natural Science Foundation of Shandong Province (ZR2020YQ35) the Young Elite Scientists Sponsorship Program by CAST (YESS, 2019QNRC001) the Youth Innovation Team Project of Shandong Provincial Education Department (2021KJ093) the Qilu Young Scholar Funding of Shandong University and the Project “20 items of University” of Jinan 

主　　题：aqueous zinc-ion batteries high performance inner solvation structure low polarity co-solvent low-temperature electrolyte 

摘      要：Aqueous zinc-ion batteries are regarded as the promising candidates for large-scale energy storage systems owing to low cost and high safety;however, their applications are restricted by their poor low-temperature performance. Herein, a low-temperature electrolyte for low-temperature aqueous zinc-ion batteries is designed by introducing low-polarity diglyme into an aqueous solution of Zn（ClO4）2. The diglyme disrupts the hydrogenbonding network of water and lowers the freezing point of the electrolyte to-105℃. The designed electrolyte achieves ionic conductivity up to16.18 mS cm-1at-45℃. The diglyme and ClO4-reconfigure the solvated structure of Zn2+, which is more favorable for the desolvation of Zn2+at low temperatures. In addition, the diglyme effectively suppresses the dendrites,hydrogen evolution reaction, and by-products of the zinc anode, improving the cycle stability of the battery. At-20℃, a Zn‖Zn symmetrical cell is cycled for 5200 h at 1 mA cm-2and 1 mA h cm-2, and a Zn‖polyaniline battery achieves an ultra-long cycle life of 10 000 times. This study sheds light on the future design of electrolytes with high ionic conductivity and easy desolvation at low temperatures for rechargeable batteries.