Fabricating a PVDF skin for PEO-based SPE to stabilize the interface both at cathode and anode for Li-ion batteries

Poly (ethylene oxide) (PEO)-based solid polymer electrolyte is always the most promising candidate for preparing thinner, lighter and safer lithium-ion batteries. However, the lithium dendrites growth of lithium anode and the high-voltage oxidation of cathode are easy to cause the PEO-based battery failure. The way to deal with the different challenges on both sides of the anode and cathode is pursued all the time. In this study, we reported a new strategy to construct the PVDF/PEO/PVDF three-layer structure for solid polymer electrolyte (marked as [email protected]) using PVDF as the functional “skin”. The [email protected] electrolyte can effectively prevent from the lithium dendrites, and shows a stable cycling life over 1000 h in the Li/[email protected]/Li cell. In addition, the [email protected] electrolyte exhibits higher oxidation resistance and can be matched with high-voltage LiCoO2 cathode. The Li/[email protected]/ LiCoO2 cell delivered a specific capacity of about 150 mAh g−1 over 150 cycles and maintained good cycling stability. Our research provides insights that the polymer electrolytes constructed with PVDF functional “skin” can simultaneously meet the challenges of both anode and cathode in solid-state lithium-ion batteries (SSLIBs).