Synergistic Effect of Cation and Anion for Low-Temperature Aqueous Zinc-Ion Battery  

作　　者：Tianjiang Sun Shibing Zheng Haihui Du Zhanliang Tao 

机构地区：[1]Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Renewable Energy Conversion and Storage Center,College of Chemistry,Nankai University,Tianjin 300071,People’s Republic of China

出　　处：《Nano-Micro Letters》2021年第12期301-310,共10页纳微快报（英文版）

基　　金：supported the National Natural Science Foundation of China(51771094 and 21835004);Ministry of Education of China(B12015);Tianjin Natural Science Foundation(18JCZDJC31500)。

摘　　要：Although aqueous zinc-ion batteries have gained great development due to their many merits,the frozen aqueous electrolyte hinders their practical application at low temperature conditions.Here,the synergistic e ect of cation and anion to break the hydrogen-bonds network of original water molecules is demonstrated by multi-perspective characterization.Then,an aqueous-salt hydrates deep eutectic solvent of 3.5 M Mg(ClO_(4))_(2)+1 M Zn(ClO_(4))_(2)is proposed and displays an ultralow freezing point of-121℃.A high ionic conductivity of 1.41 mS cm-1 and low viscosity of 22.9 mPa s at-70℃ imply a fast ions transport behavior of this electrolyte.With the benefits of the low-temperature electrolyte,the fabricated Zn||Pyrene-4,5,9,10-tetraone(PTO)and Zn||Phenazine(PNZ)batteries exhibit satisfactory low-temperature performance.For example,Zn||PTO battery shows a high discharge capacity of 101.5 mAh g^(-1)at 0.5 C(200 mA g^(-1))and 71 mAh g^(-1)at 3C(1.2 A g^(-1))when the temperature drops to-70℃.This work provides an unique view to design anti-freezing aqueous electrolyte.

关 键 词：Low-temperature aqueous zinc-ion battery 3.5M Mg(ClO_4)_(2)+1M Zn(ClO_4)_(2)electrolyte Synergistic effect Pyrene-4 5 9 10-tetraone PHENAZINE 

分 类 号：TM912[电气工程—电力电子与电力传动] O641.4[理学—物理化学]