【摘要】 液态电解液存在泄漏爆燃隐患，在锂金属电池中的实际应用受限。基于离子液体制备的聚合物固态电解质(SPE)具有阻燃性好、热稳定性好、化学与电化学稳定性高等优点，在锂金属电池上的应用前景很好。设计合成一种离子液体单体(IL),并与碳酸乙烯亚乙酯(VEC)通过自由基聚合反应共聚，制备基于P(IL-VEC)的SPE。该SPE具有良好的热稳定性和阻燃特性，室温下离子电导率较高，可抑制锂枝晶的生长，达到稳定电解质与电极界面。以该SPE匹配磷酸铁锂正极组装的全固态锂电池，循环稳定性和倍率性能较好。以0.2 C倍率在2.8～3.8 V循环，初始放电比容量达154 mAh/g,并可稳定循环超过200次，在第230次循环时的剩余容量为118 mAh/g。更多还原

【Abstract】 Liquid electrolyte had the hidden danger of leakage and deflagration, its practical application in lithium metal battery was limited.Solid polymer electrolyte(SPE) prepared using ionic liquids had several advantages, including good flame-retardant property, good thermal stability and high chemical and electrochemical stability, thus had good potential for use in lithium metal battery.A novel ion-liquid monomer(IL) was designed and synthesized, which was copolymerized with vinyl ethylene carbonate(VEC) using a free radical polymerization reaction to prepare P(IL-VEC)-based SPE.The SPE exhibited good thermal stability and flame-retardant property and demonstrated high ionic conductivity at room temperature, which could inhibit the growth of lithium dendrite and achieve stable electrolyte-electrode interface.The all solid-state lithium battery using a lithium iron phosphate cathode and the SPE exhibited good cycling stability and rate capability.It could deliver an initial specific discharge capacity of 154 mAh/g at a rate of 0.2 C cycled in 2.8-3.8 V,with stable cycling for more than 200 times and a remaining capacity of 118 mAh/g at the 230th cycle.更多还原