Modified Separators for High Performance Lithium-Sulfur Batteries
作者单位：济南大学
学位级别：硕士
导师姓名：Zhang Zhaoliang
授予年度：2017年
摘 要：Lithium-Sulfur batteries（LSBs）has gained much attraction as the future-generation rechargeable batteries owing to its exceptional specific energy density of 2600 Wh kg-1 and theoretical specific capacity of 1675 mAh g-1,which is remarkably higher than the state-of-art lithium-ion batteries（LIBs）.Moreover,sulfur also offers an advantage of high abundance and environmental ***,there are many drawbacks that are hindering its *** most critical one is the so called “shuttle effect,which is due to the dissolution of the long-chain lithium polysulfides（Li2Sx,4 ≤ x ≤ 8）into the electrolyte and their free movement between the anode and *** research in this thesis mainly focuses on the development of modified separator to inhibit the shuttling of polysulfides for obtaining high performance LSBs and is summarized as *** trioxide（MoO3）is prepared by facile hydrothermal method and is used to modify the separator to improve the performance of *** significantly suppresses the polysulfides shuttling by successfully blocking the polysulfides on the *** randomly arranged layers of MoO3 nanobelts provide enough porous networks that provide effective space for electrolyte infiltration and facile pathway for fast ionic ***,due to the excellent diffusion of lithium ions and improved reaction kinetics,the enhanced electrochemical performance is *** MoO3-modified separator exhibited a very high initial capacity of 1377 mAh g-1,684.4 mAh g-1 after 200 cycles at 0.5 C,and the capacity fading rate of only 0.251% per ***,the modification with MoO3 provides good surface protection of lithium anode and depresses the lithium anode degradation,thus protracts its *** on excellent lithium-ion diffusivity of molybdenum sulfide（MoS2）,we have successively applied MoS2 as the separator modified material by facile slurry coating *** layer successfully blocks the dissoluti
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