Regulating solid electrolyte interphases on phosphorus/carbon anodes via localized high-concentration electrolytes for potassium-ion batteries

作     者：Wei Xiao Peiyi Shi Zhengkui Li Chong Xie Jian Qin Huijuan Yang Jingjing Wang Wenbin Li Jiujun Zhang Xifei Li Wei Xiao;Peiyi Shi;Zhengkui Li;Chong Xie;Jian Qin;Huijuan Yang;Jingjing Wang;Wenbin Li;Jiujun Zhang;Xifei Li

作者机构：Key Laboratory of Advanced Batteries Materials for Electric Vehicles of China Petroleum and Chemical Industry FederationInstitute of Advanced Electrochemical Energy&School of Materials Science and EngineeringXi’an University of TechnologyXi’an 710048ShaanxiChina Engineering Research Center of Conducting Materials and Composite TechnologyMinistry of EducationXi’an 710048ShaanxiChina School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108FujianChina Center for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM)Zhengzhou UniversityZhengzhou 450001HenanChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第78卷第3期

页      面：589-605,I0016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] 0703[理学-化学] 

基　　金：supported by the National Key Research and Development Program of China(2021YFB2400200) the National Natural Science Foundation of China(52104313,22172117,52072298) the Scientific Research Program of Shaanxi Provincial Education Department(21JK0808)。 

主　　题：Potassium-ion batteries Phosphorus/carbon anodes Localized high-concentration electrolytes Solid electrolyte interphases Interfacial stability 

摘      要：The resourceful and inexpensive red phosphorus has emerged as a promising anode material of potassium-ion batteries(PIBs) for its large theoretical capacities and low redox potentials in the multielectron alloying/dealloying reactions,yet chronically suffering from the huge volume expansion/shrinkage with a sluggish reaction kinetics and an unsatisfactory interfacial stability against volatile electrolytes.Herein,we systematically developed a series of localized high-concentration electrolytes(LHCE) through diluting high-concentration ether electrolytes with a non-solvating fluorinated ether to regulate the formation/evolution of solid electrolyte interphases(SEI) on phosphorus/carbon(P/C) anodes for PIBs.Benefitting from the improved mechanical strength and structural stability of a robust/uniform SEI thin layer derived from a composition-optimized LHCE featured with a unique solvation structure and a superior K+migration capability,the P/C anode with noticeable pseudocapacitive behaviors could achieve a large reversible capacity of 760 mA h g^(-1)at 100 mA g^(-1),a remarkable capacity retention rate of 92.6% over 200 cycles at 800 mA g^(-1),and an exceptional rate capability of 334 mA h g^(-1)at8000 mA g^(-1).Critically,a suppressed reduction of ether solvents with a preferential decomposition of potassium salts in anion-derived interfacial reactions on P/C anode for LHCE could enable a rational construction of an outer organic-rich and inner inorganic-dominant SEI thin film with remarkable mechanical strength/flexibility to buffer huge volume variations and abundant K+diffusion channels to accelerate reaction kinetics.Additionally,the highly reversible/durable full PIBs coupling P/C anodes with annealed organic cathodes further verified an excellent practical applicability of LHCE.This encouraging work on electrolytes regulating SEI formation/evolution would advance the development of P/C anodes for high-performance PIBs.