High performance Zn-I_(2)battery with acetonitrile electrolyte working at low temperature  

作　　者：Chunlai Song Zongshuai Gong Chong Bai Fengshi Cai Zhihao Yuan Xizheng Liu 

机构地区：[1]School of Materials Science and Engineering,Tianjin Key Laboratory of Photoelectric Materials&Devices,Key Laboratory of Display Materials and Photoelectric Devices of Ministry of Education,Tianjin University of Technology,No.391 Binshuixi Road,Tianjin 300384,China

出　　处：《Nano Research》2022年第4期3170-3177,共8页纳米研究（英文版）

基　　金：This work was financially supported by the National Key R&D Program of China(No.2017YFA0700104);the Tianjin Natural Science Foundation of China(No.20JCZDJC00280);the National Natural Science Foundation of China(No.U1804255).

摘　　要：Large scale applications of metal-iodine batteries working at sub-zero degree have been challenged by the limited capacity and performance degradation.Herein,we firstly propose a Zn-I_(2)battery working at low temperature with a carbon composite material/iodine(CCM-I_(2))cathode,a Zn anode and an environmentally tolerable Zn(ClO4)2-ACN electrolyte.The CCM framework with hierarchical porous structure endows a powerful iodine-anchoring to overcome undesirable dissolution of iodine in organic electrolyte,and the Zn(ClO4)2-ACN electrolyte with low freezing point and high ionic conductivity enhances the low temperature performance.The synergies enable an efficiently reversible conversion of Zn-I_(2)battery even at-40℃.Therefore,the resultant Zn-I_(2)battery delivers a high specific capacity of 200 mAh·g^(-1),which is fairly approximate to the theoretical capacity of I_(2)(211 mAh·g^(-1))and a superior cycling stability with minimal capacity fading of 0.00043%per cycle over 7,000 times under 2C at-20℃.Furthermore,even at-40℃,this Zn-I_(2)battery still exhibits a good capacity retention of 68.7%compared to the capacity at 25℃ and a rapid capacity-recover ability with elevating temperature change.Our results distinctly indicate this Zn-I_(2)battery can be 1competent for the practical application under low temperature operation.

关 键 词：Zn-I_(2)battery low temperature acetonitrile electrolyte carbon composite material high performance 

分 类 号：TM912[电气工程—电力电子与电力传动] TB33[一般工业技术—材料科学与工程]