Replacement of solid polymer electrolyte (SPE) to routine liquid electrolyte is highly desirable for high-energy-density lithium sulfur batteries due to its low volatility, high safety and the ability to suppress shuttle effect. Herein, a polymer-in-salt polysiloxane SPE was fabricated with bi-grafted polysiloxane copolymer, lithium bis(trifluoromethanesulfonyl)imide and poly(vinylidene fluoride), which shows higher ionic conductivity (7.8 × 10^-4 S cm^-1 at 25 °C). To obtain the satisfactory ionic conductivity and high mechanical property of solid electrolyte simultaneously, cellulose acetate matrix was combined as a rigid substrate to prepare composite polymer electrolyte (CPE) that possesses high ionic conductivity (4.0 × 10^-4 S cm^-1), enhanced mechanical strength (6.8 MPa), wide electrochemical stability window (4.7 V vs. Li⁺/Li), and high ion transference number (0.52) at ambient temperature. In addition, the CPE effectively inhibits the growth of lithium dendrites and diffusion of polysulfides. The assembled lithium sulfur battery with CPE exhibits good room-temperature cycling performance at 1C, which indicates that such polymer-in-salt polysiloxane based composite electrolyte membranes can be applied to ambient temperature all-solid-state lithium sulfur batteries.

对于高能量密度锂硫电池，由于其低挥发性，高安全性和抑制穿梭效应的能力，因此非常需要将固体聚合物电解质（SPE）替换为常规液体电解质。本文中，用双接枝聚硅氧烷共聚物，双（三氟甲磺酰基）酰亚胺锂和聚偏二氟乙烯制备了盐分聚合物聚硅氧烷SPE，在25°C时显示出较高的离子电导率（7.8×10 ^-4 S cm ^-1） C）。为了同时获得令人满意的离子电导率和固体电解质的高机械性能，将醋酸纤维素基质作为刚性基材，以制备具有高离子电导率（4.0×10 ^-4 S cm ^-1）的复合聚合物电解质（CPE）。），增强的机械强度（6.8 MPa），宽的电化学稳定性窗口（4.7 V vs. Li ⁺ / Li）和在环境温度下较高的离子转移数（0.52）。另外，CPE有效地抑制了锂树枝状晶体的生长和多硫化物的扩散。具有CPE的组装的锂硫电池在1℃下表现出良好的室温循环性能，这表明这种盐-盐聚合物-聚硅氧烷基复合电解质膜可以应用于环境温度的全固态锂硫电池。