Regulating interfacial stability of SiO_(x) anode with fluoride-abundant solid–electrolyte interphase by fluorine-functionalized additive  

作　　者：Subin Lee Taeeun Yim 

机构地区：[1]Advanced Batteries Laboratory,Department of Chemistry,Incheon National University,Incheon,22012,Republic of Korea [2]Research Institute of Basic Sciences,College of Natural Science,Incheon National University,Incheon,22012,Republic of Korea

出　　处：《Rare Metals》2024年第2期671-681,共11页稀有金属（英文版）

基　　金：This work was financially supported by the National Research Foundation of Korea financially(NRF)(No.NRF-2022R1F1A1069039);the Core Research Institute(CRI)Program,the Basic Science Research Program through the National Research Foundation of Korea(NRF),Ministry of Education(No.NRF-2017R1A6A1A06015181);the Technology Innovation Program(No.20011905)funded by the Ministry of Trade,Industry&Energy(MOTIE,Korea).

摘　　要：Silicon oxide(SiO_(x))has received remarkable attention as a next-generation battery material;however,the sudden decrease in the cycling retention constitutes a significant challenge in facilitating its application.Tris(2,2,2-trifluoroethyl)phosphite(TTFP),which can control parasitic reactions such as the pulverization of SiO_(x)anode materials and electrolyte decomposition,has been proposed to improve the lifespan of the cell.The electrochemical reduction of TTFP results in solid-electrolyte interphase(SEI)layers that are mainly composed of LiF,which occur at a higher potential than the working potential of the SiO_(x)anode and carbonate-based solvents.The electrolyte with TTFP exhibited a substantial improvement in cycling retention after 100 cycles,whereas the standard electrolyte showed acutely decreased retention.The thickness of the SiO_(x)anode with TTFP also changed only slightly without any considerable delamination spots,whereas the SiO_(x)anode without TTFP was prominently deformed by an enormous volume expansion with several internal cracks.The cycled SiO_(x)anode with TTFP exhibited less increase in resistance after cycling than that in the absence of TTFP,in addition to fewer decomposition adducts in corresponding X-ray photoelectron spectroscopy(XPS)analyses between the cycled SiO_(x)anodes.These results demonstrate that TTFP formed SEI layers at the SiO_(x)interface,which substantially reduced the pulverization of the SiO_(x)anode materials;in addition,electrolyte decomposition at the interface decreased,which led to improved cycling retention.

关 键 词：Lithium-ion batteries(LIBs) Silicon oxide anode ELECTROLYTE ADDITIVE Solid-electrolyte interphases(SEI) Tris(2 2 2-trifluoroethyl)phosphite 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.542[理学—物理化学]