Stable operation of highly loaded pure Si-Fe anode under ambient pressure via carboxy silane-directed robust solid electrolyte interphase  

作　　者：Guntae Lim Dong Guk Kang Hyeon Gyu Lee Yen Hai Thi Tran Kihun An Junghyun Choi Kwang Chul Roh Do Youb Kim Seung-Wan Song 

机构地区：[1]Department of Chemical Engineering&Applied Chemistry Chungnam National University,Daejeon 34134,Republic of Korea [2]Energy Storage Materials Center,Korea Institute of Ceramic Engineering&Technology,Jinju 52851,Republic of Korea [3]Advanced Energy Materials Research Center,Korea Research Institute of Chemical Technology,Daejeon 34114,Republic of Korea

出　　处：《Journal of Energy Chemistry》2024年第7期568-576,共9页能源化学（英文版）

基　　金：supported by the National Research Foundation grants funded by the Ministry of Science and ICT of Korea(2021M3H4A3A02086211 and RS-2023-00217581).

摘　　要：Incorporation of higher content Si anode material beyond 5 wt% to Li-ion batteries(LIBs)is challenging,owing to large volume change,swelling,and solid electrolyte interphase(SEI)instability issues.Herein,a strategy of diacetoxydimethylsilane(DAMS)additive-directed SEI stabilization is proposed for a stable operation of Si-0.33FeSi_(2)(named as Si-Fe)anode without graphite,which provides siloxane inorganics and organics enrichment that compensate insufficient passivation of fluoroethylene carbonate(FEC)additive and reduce a dependence on FEC.Unprecedented stable cycling performance of highly loaded(3.5 mA h cm^(-2))pure Si-Fe anode is achieved with 2 wt%DAMS combined with 9 wt%FEC additives under ambient pressure,yielding high capacity 1270 mA h g^(-1)at 0.5 C and significantly improved capacity retention of 81% after 100 cycles,whereas short circuit and rapid capacity fade occur with FEC only additive.DAMS-directed robust SEI layer dramatically suppresses swelling and particles crossover through separator,and therefore prevents short circuit,demonstrating a possible operation of pure Si or Sidominant anodes in the next-generation high-energy-density and safe LIBs.

关 键 词：High-energy Li-ion battery Pure Si-Fe anode without graphite Silane additive SEI layer Suppressed swelling 

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