Nanoporous ZnGa2O4-modified separator as a multifunctional polysulphide barrier for advanced lithium-sulfur batteries

Nanoporous ZnGa 2 O 4 was synthesised as a separator modifier for lithium‑sulfur batteries via a one-step sol-gel process followed by high-temperature calcination. The modified separator could effectively adsorb and catalyse lithium polysulphides, thus inhibiting the shuttle effect and improving their redox kinetics. The three-dimensional porous structure of ZnGa 2 O 4 with high surface area that can effectively relieve the volume expansion of S 8 during cycling process and provide transport channels for both electrons and Li + ion. Consequently, the battery with the ZnGa 2 O 4 interlayer exhibited excellent reversibility and stability, with a reversible capacity of 723.4 mAh·g −1 after 300 cycles at 1C. Furthermore, Li S cells with modified separators demonstrated enhanced rate capability (704.3 mAh g −1 at 5C) compared with commercial separators. • Nanoporous ZnGa 2 O 4 was firstly synthesised as separator modification for LSBs. • The ZnGa 2 O 4 provide abundant pores for the transportation of Li + ion and electron. • The ZnGa 2 O 4 can effective adsorption of polysulfides when as catalyst for LSBs. • The ZnGa 2 O 4 can provide fast redox reaction for Li 2 S deposition and decomposition.