Yang Shuang, Zhang Junfan, Tan Taizhe, Zhao Yan, Liu Ning, Li Haipeng
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
Synergy Innovation Institute of GDUT, Heyuan 517000, China.
Materials (Basel). 2018 Oct 22;11(10):2064. doi: 10.3390/ma11102064.
Lithium-sulfur (Li-S) batteries are the most prospective energy storage devices. Nevertheless, the poor conductivity of sulfur and the shuttling phenomenon of polysulfides hinder its application. In this paper, flower-like MoS₂/graphene nanocomposite is prepared and deposited on a multi-functional separator to enhance the electrochemical behavior of Li-S batteries. The results demonstrated that the MoS₂/graphene-coated separator is contributing to inhibit the shuttling phenomenon of polysulfides and improve the integrity of sulfur electrode. The initial discharge capacity of the battery using MoS₂/graphene-coated separator at 0.2 C was up to 1516 mAh g. After 100 cycles, a reversible capacity of 880 mAh g and a coulombic efficiency of 98.7% were obtained. The improved electrochemical behavior can be due to the nanostructure and Mo-S bond of the MoS₂/graphene composite, which can combine physical shielding and chemisorption to prohibit the shuttle effect of polysulfides. The results prove that the MoS₂/graphene-coated separator has the potential for feasible application in Li-S batteries to enhance their electrochemical performance.
锂硫（Li-S）电池是最具前景的储能装置。然而，硫的导电性差以及多硫化物的穿梭现象阻碍了其应用。本文制备了花状MoS₂/石墨烯纳米复合材料并沉积在多功能隔膜上，以增强锂硫电池的电化学性能。结果表明，涂覆有MoS₂/石墨烯的隔膜有助于抑制多硫化物的穿梭现象并提高硫电极的完整性。使用涂覆有MoS₂/石墨烯的隔膜的电池在0.2 C下的初始放电容量高达1516 mAh/g。经过100次循环后，获得了880 mAh/g的可逆容量和98.7%的库仑效率。电化学性能的改善可能归因于MoS₂/石墨烯复合材料的纳米结构和Mo-S键，其可以结合物理屏蔽和化学吸附来抑制多硫化物的穿梭效应。结果证明，涂覆有MoS₂/石墨烯的隔膜在锂硫电池中具有可行应用的潜力，以提高其电化学性能。
