高还原氧化石墨烯隔膜应用于锂硫电池的研究  

Highly-reduced graphene oxide separator for lithium-sulfur batteries

作　　者：张康明 戴丽琴 谢莉婧[2] 苏方远[2] 刘卓[2] 陈志文[1] 陈成猛[2] ZHANG Kang-ming;DAI Li-qin;XIE Li-jing;SU Fang-yuan;LIU Zhuo;CHEN Zhi-wen;CHEN Cheng-meng(School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,China;Key Laboratory of Carbon Materials,Institute of Coal Chemistry of Chinese Academy of Sciences,Taiyuan 030001,China)

机构地区：[1]上海大学环境与化学工程学院,上海200444 [2]中国科学院山西煤炭化学研究所炭材料重点实验室,山西太原030001

出　　处：《现代化工》2020年第1期150-154,160,共6页Modern Chemical Industry

基　　金：山西省重大专项(MC2016-8,MC2016-4);省青年科技研究基金(201601D021061)

摘　　要：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1143.2 m Ah/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 m Ah/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(Hr GO)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 Hr GO separator reaches 1143.2 m Ah·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 m Ah·g-1.The results show that Hr GO separator can effectively improve the electrochemical properties of Li-S battery,presenting the excellent long cycle stability and prominent rate performance.

关 键 词：锂硫电池 高还原氧化石墨烯 隔膜 空间位阻 高导电性 

分 类 号：TM912[电气工程—电力电子与电力传动]