化学沉淀法制备S-FeS/介孔碳复合材料及其电化学性能

施再发, 杨少彬, 刘景东, 张少铜, 张诗群, 吴丽坤

施再发, 杨少彬, 刘景东, 等. 化学沉淀法制备S-FeS/介孔碳复合材料及其电化学性能[J]. 复合材料学报, 2015, 32(2): 341-346. DOI: 10.13801/j.cnki.fhclxb.20140617.002
引用本文: 施再发, 杨少彬, 刘景东, 等. 化学沉淀法制备S-FeS/介孔碳复合材料及其电化学性能[J]. 复合材料学报, 2015, 32(2): 341-346. DOI: 10.13801/j.cnki.fhclxb.20140617.002
SHI Zaifa, YANG Shaobin, LIU Jingdong, et al. Preparation of S-FeS/mesoporous carbon composites by chemical precipitation and its electrochemical properties[J]. Acta Materiae Compositae Sinica, 2015, 32(2): 341-346. DOI: 10.13801/j.cnki.fhclxb.20140617.002
Citation: SHI Zaifa, YANG Shaobin, LIU Jingdong, et al. Preparation of S-FeS/mesoporous carbon composites by chemical precipitation and its electrochemical properties[J]. Acta Materiae Compositae Sinica, 2015, 32(2): 341-346. DOI: 10.13801/j.cnki.fhclxb.20140617.002

化学沉淀法制备S-FeS/介孔碳复合材料及其电化学性能

基金项目: 国家基础科学人才培养基金(J1103303)
详细信息
    通讯作者:

    刘景东,博士,副教授,硕士生导师,研究方向为固体电解质及化学电源.E-mail:ljd@fzu.edu.cn

  • 中图分类号: TB332

Preparation of S-FeS/mesoporous carbon composites by chemical precipitation and its electrochemical properties

  • 摘要: 为提高锂硫电池的循环性能, 采用化学沉淀法制备了负载有FeS的介孔碳(MC)复合材料FeS/MC, 通过热复合获得了负载S的MC复合材料S/MC和负载S、FeS的MC复合材料S-FeS/MC。FeS/MC的SEM照片表明, FeS可充填MC表面的孔洞。N2吸脱附等温线表明, 负载FeS后, MC的比表面积大幅下降, 但平均孔径增大。XRD谱图表明, 当负载FeS的含量达到20wt%时, 出现了Fe3S4晶相。电化学性能测试结果表明:负载于MC中的FeS本身没有电化学活性, 但它对多硫离子的氧化还原过程有催化作用, 提高了电极的可逆性; S-FeS/MC的二次放电比容量保持率高于S/MC的比容量保持率, 表现出较轻的"飞梭效应"; S-FeS/MC的二次放电比容量为1 108.8 mA·h/g, 50次循环容量保持率为43.7%, 高于S/MC的容量保持率, 表现出较好的循环性能。
    Abstract: In order to improve the cycle performance of lithium sulphur battery, chemical precipitation was adopted to prepare FeS immobilized mesoporous carbon (MC) composites FeS/MC. S immobilized MC composites S/MC and S-FeS immobilized composites S-FeS/MC were prepared by hot mixing. The SEM photographs show that holes on the surface of MC are filled by FeS; N2 adsorption-desorption isotherms indicate that after the immobilization of FeS, the specific area of MC decreases greatly, while the average diameter of holes increases. XRD patterns show that when the content of immobilized FeS reaches 20wt%, Fe3S4 phase appears. Electrochemical test results show that although FeS immobilized in MC shows no electrochemical activity, it has catalytic effect in the redox process of polysulfides, thus enhances the reversibility of cathode. The retention rate of 2nd specific discharge capacity of S-FeS/MC is higher than that of S/MC, and shows the lighter "shuttle effect". 2nd specific discharge capacity of S-FeS/MC is 1 108.8 mA·h/g, and the capacity retention rate after 50 cycles is 43.7%, which is higher than the capacity retention of S/MC, and shows superior cycle performance.
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    其他类型引用(13)

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出版历程
  • 收稿日期:  2014-02-16
  • 修回日期:  2014-05-22
  • 刊出日期:  2015-04-14

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