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首页> 外文期刊>Advanced Functional Materials >Carbonized Polyacrylonitrile-Stabilized SeS_x Cathodes for Long Cycle Life and High Power Density Lithium Ion Batteries
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Carbonized Polyacrylonitrile-Stabilized SeS_x Cathodes for Long Cycle Life and High Power Density Lithium Ion Batteries

机译：碳化聚丙烯腈稳定的SeS_x阴极，具有长寿命和高功率密度锂离子电池的特点

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摘要

A facile synthesis of selenium sulfide (SeS_x)/carbonized polyacrylonitrile (CPAN) composites is achieved by annealing the mixture of SeS_2 and polyacrylonitrile (PAN) at 600 ℃ under vacuum. The SeS_x molecules are confined by N-containing carbon (ring) structures in the carbonized PAN to mitigate the dissolution of polysulfide and polyselenide intermediates in carbonate-based electrolyte. In addition, formation of solid electrolyte interphase (SEI) on the surface of SeS_x/CPAN electrode in the first cycle further prevents polysulfide and polyselenide intermediates from dissolution. The synergic restriction of SeS_x by both CPAN matrix and SEI layer allows SeS_x/CPAN composites to be charged and discharged in a low-cost carbonate-based electrolyte (LiPF_6 in EC/DEC) with long cycling stability and high rate capability. At a current density of 600 mA g~(-1) it maintains a reversible capacity of 780 mAh g~(-1) for 1200 cycles. Moreover, it retains 50% of the capacity at 60 mA g~(-1) even when the current density increases to 6 A g~(-1). The superior electrochemical performance of SeS_x/CPAN composite demonstrates that it is a promising cathode material for long cycle life and high power density lithium ion batteries. This is the first report on long cycling stability and high rate capability of selenium sulfide-based cathode material.
机译：通过将SeS_2和聚丙烯腈（PAN）的混合物在600℃下真空退火，可以轻松合成硫化硒（SeS_x）/碳化聚丙烯腈（CPAN）复合材料。 SeS_x分子受碳化PAN中的含N碳（环）结构限制，以减轻聚硫化物和聚硒化物中间体在碳酸盐基电解质中的溶解。另外，在第一循环中在SeS_x / CPAN电极的表面上形成固体电解质相（SEI）进一步防止了聚硫化物和聚硒化物中间体的溶解。 CPAN基质和SEI层对SeS_x的协同限制使得SeS_x / CPAN复合材料可以在低成本的碳酸盐基电解质（EC / DEC中为LiPF_6）中进行充电和放电，且循环稳定性长且速率高。在600 mA g〜（-1）的电流密度下，它在1200个循环中保持780 mAh g〜（-1）的可逆容量。此外，即使电流密度增加到6 A g〜（-1），它在60 mA g〜（-1）时仍保持50％的容量。 SeS_x / CPAN复合材料的优异电化学性能表明，它是长寿命和高功率密度锂离子电池的有希望的正极材料。这是关于硫化硒基正极材料的长循环稳定性和高倍率性能的首次报道。

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  • 来源
    《Advanced Functional Materials》 |2014年第26期|4082-4089|共8页
  • 作者

    Chao Luo; Yujie Zhu; Yang Wen; Jingjing Wong; Chunsheng Wang;

  • 作者单位

    Department of Chemical and Biomolecular Engineering University of Maryland College Park, Maryland 20742, USA;

    Department of Chemical and Biomolecular Engineering University of Maryland College Park, Maryland 20742, USA;

    Department of Chemical and Biomolecular Engineering University of Maryland College Park, Maryland 20742, USA;

    Department of Chemistry and Biochemistry University of Maryland College Park, Maryland 20742, USA;

    Department of Chemical and Biomolecular Engineering University of Maryland College Park, Maryland 20742, USA;

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