Adjusting the local solvation structures and hydrogen bonding networks for stable aqueous batteries with reduced cost  

作　　者：Canfu Zhang Binbin Chen Haoran Cai Renzhi Huang Yingchun Liu Huilin Pan 

机构地区：[1]Department of Chemistry,Zhejiang University,Hangzhou 310027,Zhejiang,China

出　　处：《Journal of Energy Chemistry》2022年第5期411-419,共9页能源化学（英文版）

基　　金：supported by the Startup Foundation for Hundred-Talent Program of Zhejiang University。

摘　　要：Exploring low-cost and effective approaches to extend the potentials of aqueous electrolytes is highly desired.Herein,it is found that the activity of H_(2)O in aqueous electrolytes could be intensively manipulated by introducing small urea and long-chain polyethylene glycol(PEG)molecules into Li TFSI-H_(2)O electrolyte systems without super salt concentration.The urea and PEG molecules could exclude partial coordinated H_(2)O out of the inner solvation shell of Li_(4) and reconstruct hydrogen-bonding network between H_(2)O and PEG molecules outside the solvation sheaths with restricted H_(2)O activity and extended electrochemical window.The bonding competitions in aqueous electrolytes and their correlation to the electrochemical performance of full cells are studied.When the occurrence probability of H_(2)O around Li_(4)is lower than 40%,stable cycling of 3.1 V LiMn_(2)O_(4)-Li_(4)Ti_(5)O_(12) full cell is achieved,showing 73%capacity retention after 200 cycles at 1 C rate in optimal electrolytes.This work provides new avenues to understand the role of H_(2)O and explore low-cost and effective approaches for the development of nextgeneration aqueous lithium-ion batteries.

关 键 词：Solvation sheath H_(2)O activity Aqueous electrolytes Lithium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] O626[理学—有机化学]