多硫化物
电解质
材料科学
离子电导率
阳极
电化学
锂(药物)
无机化学
分离器(采油)
电化学窗口
化学工程
锂硫电池
化学
电极
物理
工程类
内分泌学
热力学
物理化学
医学
作者
Xingwen Yu,Zhonghe Bi,Feng Zhao,Arumugam Manthiram
标识
DOI:10.1021/acsami.5b04209
摘要
Lithium-sulfur (Li-S) batteries are receiving great attention as the most promising next-generation power source with significantly high charge-storage capacity. However, the implementation of Li-S batteries is hampered by a critical challenge because of the soluble nature of the intermediate polysulfide species in the liquid electrolyte. The use of traditional porous separators unavoidably allows the migration of the dissolved polysulfide species from the cathode to the lithium-metal anode and results in continuous loss of capacity. In this study, a LiSICON (lithium super ionic conductor) solid membrane is used as a cation-selective electrolyte for lithium-polysulfide (Li-PS) batteries to suppress the polysulfide diffusion. Ionic conductivity issue at the lithium metal/solid electrolyte interface is successfully addressed by insertion of a "soft", liquid-electrolyte integrated polypropylene interlayer. The solid LiSICON lithium-ion conductor maintains stable ionic conductivity during the electrochemical cycling of the cells. The Li-PS battery system with a hybrid solid/liquid electrolyte exhibits significantly enhanced cyclability relative to the cells with the traditional liquid-electrolyte integrated porous separator.
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