锂硫电池作为高能量密度的二次电池存在硫的低导电性和多硫化物的穿梭效应等问题。通过制备高还原度的氧化石墨烯隔膜，并将其应用于锂硫电池。利用石墨烯片层形成的空间位阻和小介孔结构，可阻挡多硫化物的迁移以及其高导电性可减弱电池极化。在0.2 C下，采用高还原氧化石墨烯隔膜的锂硫电池初始比容量达到了1 143.2 mAh/g，经过100次循环后容量保持率为74.25%。此外，在2 C下仍有626.1 mAh/g的比容量。表明高还原氧化石墨烯隔膜可以有效提升锂硫电池的电化学性能，体现出卓越的长循环稳定性和杰出的倍率性能。

Lithium-sulfur (Li-S) battery is expected to be widely applied as a secondary battery with a high energy density.However,it has some problems such as low conductivity of sulfur and shuttle effect of polysulfides,which limiting its development and application.Highly-reduced graphene oxide (HrGO) separator are prepared and applied to Li-S batteries.The migration of polysulfides can be blocked by the space steric hindrance and small mesoporous structure formed by graphene sheets,and graphene's high conductivity can reduce the polarization of battery.Under 0.2 C,the initial specific capacity of the Li-S battery with HrGO separator reaches 1 143.2 mAh·g^-1,and the capacity retention rate maintains 74.25% after 100 cycles.Under 2 C,in addition,the battery has still a specific capacity of 626.1 mAh·g^-1.The results show that HrGO separator can effectively improve the electrochemical properties of Li-S battery,presenting the excellent long cycle stability and prominent rate performance.

张康明(1994-),男,硕士研究生,研究方向为锂硫电池中功能化隔膜,1242691489@qq.com