Implanting a preferential solid electrolyte interphase layer over anode electrode of lithium ion batteries for highly enhanced Li^+ diffusion properties  

作　　者：Ye Kyu Kim Yoongon Kim Jaejin Bae Hyunwoo Ahn Yuseong Noh Hyunsu Han Won Bae Kim 

机构地区：[1]Department of Chemical Engineering,Pohang University of Science and Technology(POSTECH),Nam-gu 37673,Pohang,South Korea

出　　处：《Journal of Energy Chemistry》2020年第9期285-292,I0009,共9页能源化学（英文版）

基　　金：supported by Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(NRF-2019R1A2C2088174)。

摘　　要：The lithium-ion batteries are recognized as the most promising energy storage system,but it still does not meet the power requirements of electric vehicle batteries owing to low volumetric energy density with the traditional graphite electrode system.In this study,we report the development of a novel electrode system fabricated by implantation of a solid electrolyte interphase(SEI)layer on the graphite surface.The SEI-implanted graphite electrode is made using a lithium bis(trifluoromethanesulfonyl)imide(LiTFSI)-based electrolyte and cycled with a lithium tetrafluoroborate LiBF4-based electrolyte.This new electrode system shows significantly enhanced electrochemical properties owing to the rapid and efficient diffusion of Li ions through the SEI layer between the electrolyte and electrode.This graphite electrode with its pre-formed SEI layer achieves a reversible capacity of 357 mAh g^-1 at 0.5 C after 50 cycles,which is significantly higher than that of commercial lithium-ion battery systems constructed with LiPF6(312mAh g^-1).The resulting unique electrode system could present a new avenue in SEI research for highperformance lithium-ion batteries.

关 键 词：SEI layer GRAPHITE Implanting Li ion diffusion LITFSI LiBF4 Artificial Mobility 

分 类 号：TM912[电气工程—电力电子与电力传动] TB306[一般工业技术—材料科学与工程]