Understanding electrolyte salt chemistry for advanced potassium storage performances of transition-metal sulfides

作     者：Guangyao Ma Yingying Wang Jinmei Song Kepeng Song Nana Wang Jian Yang Yitai Qian Guangyao Ma;Yingying Wang;Jinmei Song;Kepeng Song;Nana Wang;Jian Yang;Yitai Qian

作者机构：Key Laboratory of Colloid and Interface ChemistryMinistry of EducationSchool of Chemistry and Chemical EngineeringShandong UniversityJinanChina Department of Health ManagementShandong Vocational College of Light IndustryZiboChina Institute for Superconducting and Electronic MaterialsUniversity of Wollongong Innovation CampusInnovation CampusWollongongNew South WalesAustralia 

出 版 物：《Carbon Energy》 (碳能源（英文）)

年 卷 期：2022年第4卷第3期

页      面：332-345页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 070303[理学-有机化学] 0703[理学-化学] 

基　　金：support of the Science,Technology,and Innovation Commission of Shenzhen Municipality(JCYJ20180305000927) the Natural Science Fundamental Research Funds of Shandong University(2018JC023) the Shandong Provincial Natural Science Foundation(ZR2020MB048),and the National Nature Science Foundation of China(No.21971146) 

主　　题：anode materials electrolyte chemistry MoS_(2) potassium-ion batteries 

摘      要：Molybdenum disulfide/carbon nanotubes assembled by ultrathin nanosheets are synthesized to illustrate the electrolyte salt chemistry via potassium bis-(fluorosulfonyl)imide(KFSI)versus potassium hexafluorophosphate(KPF6).Compared to the case of KPF6,the electrochemical performances using KFSI as the electrolyte salt are greatly improved:~275 mAh g^(−1) after 15,000 cycles at 1 A g^(−1),or~172 mAh g^(−1) even at 40 A g^(−1).These results represent one of the best performances for the reported anode *** enhanced performances could be attributed to the FSI-induced changes in the solvate structures,that is,a large solvation energy,a high lowest unoccupied mole cular orbital,and a small bonding dissociation energy of *** this case,a uniform and robust solid-electrolyte interphase(SEI)is produced,improving the mechanical properties and the interface ***,the uncontrollable fracture and repeated growth of SEI,which always lead to the dissolution of sulfur species and the blockage of charge transfer in the case of KPF6,are well *** similar enhancement works for other sulfides by KFSI,demonstrating the general importance of this electrolyte salt chemistry.