Research progress on artificial interfacial layers on silicon-based anodes for lithium-ion batteries
Silicon(Si)-based materials are promising anodes for high energy density lithium-ion batteries due to their high theoretical specific capacity and suitable operating voltage.However,the large volume expansion/shrinkage of Si anode during lithiation/delithiation causes the fragmentation of active particles and the rupture of solid electrolyte interphase(SEI),which severely limits the practical application of Si-based anode materials.The development of artificial solid electrolyte interphases(A-SEIs)offers the possibility of solving the interfacial stability problems of Si-based anodes.Compared to the routine SEI generated by conventional electrolyte decomposition,the A-SEIs exhibit a highly tunability in both chemistry and structure.This paper reviews the current status of A-SEIs for Si-based anodes,firstly introduces the general design principles and preparation methods of A-SEIs,then categorizes and summarizes recent studies on A-SEIs used to improve the interfacial stability of Si-based anodes.The mechanisms of the A-SEIs with different functions in improving the interfacial stabilization of Si-based electrodes are discussed.Finally,the future development trends of A-SEIs used for Si-based anode materials are prospected.
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