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

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^-1 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^-1 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.