An ultra-low concentration electrolyte with fluorine-free bulky anions for stable potassium metal batteries
作者机构：State Key Laboratory of Materials-Oriented Chemical Engineeringand School of Energy Science and EngineeringNanjing Tech UniversityNanjing 211816China Jiangsu Sunpower Co.Ltd.Taixing 225411China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2023年第16卷第6期
页 面：8290-8296页
核心收录：
学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 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]
基 金：supported by the National Natural Science Foundation of China(Nos.21975124 and 52173173) supported by 21C Innovation Laboratory,Contemporary Amperex Technology Ltd(No.21C-OP-202008)
主 题：potassium metal batteries ultra-low concentration electrolyte high transference number
摘 要：Potassium metal battery is a promising alternative to Li-ion battery for large-scale energy storage due to the abundant potassium resources and high energy ***,it suffers from rapid capacity fading and safety issues due to the uncontrolled dendrite ***,we design a fluorine-free ultra-low concentration electrolyte(ULCE)with the super bulky[BPh_(4)]^(−) anions for stable potassium metal *** this special electrolyte,the migration rate of K+in the electrolyte is about six times faster than that of the[BPh_(4)]^(−) anions because of the super bulky structure of the[BPh_(4)]^(−) anions,thus resulting in a high K^(+)transference number of *** high transference number can effectively make up for the deficiency of K^(+)in ULCE for ensuring the normal operation of the potassium metal *** addition,the improved transference number can also promote the uniform distribution of K^(+)flux on the surface of the K metal anode,resulting in uniform K *** a result,this electrolyte achieves a high K plating/stripping Coulombic efficiency of 92.6%over 200 cycles and a stable discharging/charging for 100 cycles under the full battery configuration(K used as the anode and perylene-3,4,9,10-tetracarboxylic dianhydride used as the cathode).
维普期刊数据库