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 Chunlai Song;Zongshuai Gong;Chong Bai;Fengshi Cai;Zhihao Yuan;Xizheng Liu

作者机构：School of Materials Science and EngineeringTianjin Key Laboratory of Photoelectric Materials&DevicesKey Laboratory of Display Materials and Photoelectric Devices of Ministry of EducationTianjin University of TechnologyNo.391 Binshuixi RoadTianjin 300384China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2022年第15卷第4期

页      面：3170-3177页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

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). 

主　　题：Zn-I_(2)battery low temperature acetonitrile electrolyte carbon composite material high performance 

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.