FeSx包覆VS4/RGO的合成及储锂性能研究
FeSx Modification of VS4/RGO Cathode for Improved Lithium Storage Performance
DOI: 10.12677/MS.2018.86080, PDF,   
作者: 王梨梨, 陈伟伦, 张五星：华中科技大学材料科学与工程学院，湖北 武汉
关键词: 锂离子电池；四硫化钒；多硫离子；FeSx；Lithium Ion Batteries； VS4； Polysulfide； FeSx
摘要: VS4的放电电压大约在2.0 V，用作锂离子电池正极材料其电化学稳定性较差，主要原因在于多硫离子在醚类电解液中的溶解。因此，本论文采用溶液法制备了FeSx包覆VS4/RGO复合材料作为锂离子电池正极材料。研究表明，所得到的FeSx-VS4/RGO复合正极材料在醚类电解液中的循环性能和倍率性能均得到明显改善。在100 mA∙g−1的电流密度下，循环100圈后仍具有456 mAh∙g−1的比容量，在1.0 A∙g−1的倍率下，比容量可达372 mAh∙g−1。进一步分析表明，FeSx包覆层能够化学吸附多硫离子，抑制多硫离子在醚类电解液中的溶解和穿梭，进而降低其自放电效应。而且，FeSx包覆层能够促进锂离子的迁移，提高电化学反应的动力学过程，进而改善VS4/RGO正极材料在醚类电解液中的储锂性能。
Abstract: VS4 cathode with discharge plateau close to 2.0 V presented the unsatisfactory performance in lithium ion batteries, which was mainly ascribed to the dissolution of the polysulfide in ether based electrolyte. Therefore, we prepared the FeSx-coated VS4/RGO composites via solution method. When used as cathode, FeSx-VS4/RGO exhibited enhanced electrochemical properties than the pristine VS4/RGO. After 100 cycles, it could deliver a capacity of 456 mAh∙g−1 at the current density of 100 mA∙g−1, and at 1.0 A∙g−1, a capacity of 372 mAh∙g−1 was maintained. The mechanism analysis demonstrates that FeSx can chemically absorb the polysulfides and suppress the dissolution and shuttle of polysulfides to alleviate the self-discharge behavior of VS4. Besides, FeSx can facilitate the Li migration to improve the reaction kinetics. Hence, the lithium storage performance of VS4/RGO cathode was significantly improved.
文章引用：王梨梨, 陈伟伦, 张五星. FeSx包覆VS4/RGO的合成及储锂性能研究[J]. 材料科学, 2018, 8(6): 677-686. https://doi.org/10.12677/MS.2018.86080

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