Highly-reduced graphene oxide separator for lithium-sulfur batteries
ZHANG Kang-ming1,2, DAI Li-qin2, XIE Li-jing2, SU Fang-yuan2, LIU Zhuo2, CHEN Zhi-wen1, CHEN Cheng-meng2
1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China; 2. Key Laboratory of Carbon Materials, Institute of Coal Chemistry of Chinese Academy of Sciences, Taiyuan 030001, China
Abstract: 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.
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