Advanced flame-retardant electrolyte for highly stabilized K-ion storage in graphite anode  

钾离子电池先进阻燃电解质:石墨负极的高稳定储钾

作　　者：Hao-Jie Liang Zhen-Yi Gu Xin-Xin Zhao Jin-Zhi Guo Jia-Lin Yang Wen-Hao Li Bao Li Zhi-Ming Liu Zhong-Hui Sun Jing-Ping Zhang Xing-Long Wu 梁皓杰;谷振一;赵欣欣;郭晋芝;杨佳霖;李文灏;李苞;刘治明;孙中辉;张景萍;吴兴隆(Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education,Northeast Normal University,Changchun 130024,China;Department of Chemistry,Northeast Normal University,Changchun 130024,China;School of Chemistry and Chemical Engineering,Henan Normal University,Xinxiang 453007,China;College of Electromechanical Engineering,Shandong Engineering Laboratory for Preparation and Application of High-performance Carbon-Materials,Qingdao University of Science and Technology,Qingdao 266061,China;Center for Advanced Analytical Science,School of Chemistry and Chemical Engineering,Key Laboratory for Water Quality and Conservation of the Pearl River Delta of Ministry of Education,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education,Northeast Normal University,Changchun 130024,China [2]Department of Chemistry,Northeast Normal University,Changchun 130024,China [3]School of Chemistry and Chemical Engineering,Henan Normal University,Xinxiang 453007,China [4]College of Electromechanical Engineering,Shandong Engineering Laboratory for Preparation and Application of High-performance Carbon-Materials,Qingdao University of Science and Technology,Qingdao 266061,China [5]Center for Advanced Analytical Science,School of Chemistry and Chemical Engineering,Key Laboratory for Water Quality and Conservation of the Pearl River Delta of Ministry of Education,Guangzhou University,Guangzhou 510006,China

出　　处：《Science Bulletin》2022年第15期1581-1588,M0004,共9页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(91963118 and 52173246);Science Technology Program of Jilin Province(20200201066JC);the 111 Project(B13013)。

摘　　要：Although graphite anodes operated with representative de/intercalation patterns at low potentials are considered highly desirable for K-ion batteries,the severe capacity fading caused by consecutive reduction reactions on the aggressively reactive surface is inevitable given the scarcity of effective protecting layers.Herein,by introducing a flame-retardant localized high-concentration electrolyte with retentive solvation configuration and relatively weakened anion-coordination and non-solvating fluorinated ether,the rational solid electrolyte interphase characterized by well-balanced inorganic/organic components is tailored in situ.This effectively prevented solvents from excessively decomposing and simultaneously improved the resistance against K-ion transport.Consequently,the graphite anode retained a prolonged cycling capability of up to 1400 cycles(245 mA h g,remaining above 12 mon)with an excellent capacity retention of as high as 92.4%.This is superior to those of conventional and high-concentration electrolytes.Thus,the optimized electrolyte with moderate salt concentration is perfectly compatible with graphite,providing a potential application prospect for K-storage evolution.在钾离子电池石墨负极中,钾离子在石墨层间嵌入/脱出的模式能够实现储能,且具有较低工作电位和廉价等优势,表现出巨大的吸引力.然而,在缺乏足够界面保护等条件下,石墨负极在传统碳酸酯类电解液中容易发生连续的副反应,充放电容量会面临严重的持续衰减.本文从电解液设计的角度出发,针对石墨负极的钾离子存储问题,配制了阻燃的局部高浓度电解液,其特有的溶剂化结构可调控石墨表面固体电解质界面相,改善界面的结构稳定性和离子传导特性,从而实现石墨负极储钾的高稳定循环.同时,电解液的高阻燃特性也为钾离子电池的高安全性提供了保障.

关 键 词：Graphite anode K-ion batteries Localized high-concentration electrolyte Interphase modification 

分 类 号：TQ127.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]