锂-硫电池中聚合物粘结剂的研究进展

Research Progress in Polymer Binders for Lithium-Sulfur Batteries

锂-硫电池由于其高比容量(1675mA·h·g^-1)和高能量密度(2600Wh·kg^-1)吸引了许多科学家的关注。同时,硫具有无毒,储量多且环境友好等优点。然而,硫的绝缘性、多硫化物引起的穿梭效应以及充放电过程中的体积膨胀阻碍了锂-硫电池的实际应用。为解决上述问题,针对电极活性材料所面临的难题,大量工作围绕着对导电碳基材、金属化合物、导电聚合物进行化学修饰而展开。另外,也有一些工作研究了新型聚合物粘结剂。本文总结了近期关于锂-硫电池新型粘结剂的研究进展,主要分为非水溶性粘结剂和水溶性粘结剂,并展望了未来新型粘结剂的发展。

Lithium-Sulfur(Li-S) batteries have attracted great attention because of their excellent capacity and high theoretical energy density. At the same time, sulfur has a serious of advantages, such as nontoxic, abundant and environmentally friendly. However, insulating property of sulfur, shuttle effect of polysulfides and volumetric expansion during charge-discharge process restricted the application of Li-S batteries. Strategies of modifying the conductive carbon-based materials and employing polymer binders were developed to solve the problems. In this mini-review, we assessed nonaqueous binders and aqueous binders and look forward to the further development of new binders.