Duplex component additive of tris(trimethylsilyl) phosphite-vinylene carbonate for lithium sulfur batteries

The practical application of lithium–sulfur battery, one of the most promising batteries close to market, is hindered by its poor cyclibility. Herein, Tris(trimethylsilyl) phosphite-Vinylene carbonate (TMSP-VC) is firstly investigated as a duplex-component additives to prolong the cycle life and enhance the rate performance of Li-S batteries. TMSP and VC function synergistically to modify the interfacial film of sulfur cathode and Li anode, and accelerate the lithium ion diffusion. Using traditional carbonate electrolyte with 1 wt%TMSP-2 wt%VC additives, S@pPAN cathode delivers a reversible capacity of 1243 mA h g−1 over 800 cycles at 1 C, and a discharge capacity of 990 mA h g−1 at the extremely high rate of 20 C.