A hexagonal-BN filler boosts the electrochemical performance of polymeric solid-state electrolytes for sodium–metal batteries

In order to improve the electrochemical performance of PVDF-HFP solid-state electrolytes, we introduced hexagonal-BN into the PVDF-HFP polymer matrix. The strong interaction of hexagonal-BN on TFSI^- promotes the dissociation of sodium salts and restricts the movement of TFSI^-, which improves the Na⁺ transference number and the interfacial stability of solid-state electrolytes.