首页|Stable operation of highly loaded pure Si-Fe anode under ambient pressure via carboxy silane-directed robust solid electrolyte interphase
Stable operation of highly loaded pure Si-Fe anode under ambient pressure via carboxy silane-directed robust solid electrolyte interphase
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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-0.33FeSi2(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 addi-tive.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 Si-dominant anodes in the next-generation high-energy-density and safe LIBs.
High-energy Li-ion batteryPure Si-Fe anode without graphiteSilane additiveSEI layerSuppressed swelling
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
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Department of Chemical Engineering & Applied Chemistry Chungnam National University,Daejeon 34134,Republic of Korea
Energy Storage Materials Center,Korea Institute of Ceramic Engineering & Technology,Jinju 52851,Republic of Korea
Advanced Energy Materials Research Center,Korea Research Institute of Chemical Technology,Daejeon 34114,Republic of Korea
National Research Foundation grants funded by the Ministry of Science and ICT of KoreaNational Research Foundation grants funded by the Ministry of Science and ICT of Korea
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