An economic integrated self-standing Anode@Quasi-solid-state electrolyte membrane for high-performance lithium-ion batteries.

Solid-state lithium-ion batteries (SSLIBs) are considered as the coming generation of high energy density batteries. To eliminate the "shuttle effect" and improve the interfacial properties between solid-state electrolyte and anode electrode in SSLIBs, a strategy of integrating anode and quasi-solid-state electrolyte is proposed in current study. Using silica coated electro-spun polyacrylonitrile (PAN) nanofiber film as the starting material, a self-standing Si/SiC/C nanofiber composite film (SNF) was obtained after magnesiothermic reduction, which was then applied as anode as well as electro-spun PAN nanofiber collector. An integrated anode@electrolyte membrane (SNF@PAN-E) was finally achieved by showing extremely low interfacial resistance down to 8.6 Ω after 100 cycles at room temperature. Moreover, mesoporous silica nanofibers were incorporated into the electro-spun PAN to make quasi-solid-state PANS-15-E electrolyte membrane, improving its ionic conductivity up to 8.0 mS cm with Li ions migration number of 0.76 and the electrochemical window of 5.1 V. Electrochemical tests indicated that, the assembled SNF@PAN-E|Li and SNF@PANS-15-E|Li batteries showed excellent cycling stability and rating performance as prospected. Especially, the assembled SNF@PANS-15-E|LFP full battery also exhibited a capacity over 90 mAh g after 580 cycles at a high current density of 5.9C without using the anode current collector, proving the applicability of this integrated anode@electrolyte membrane, and indicating an economic and effective strategy for producing new SSLIBs.