Porous spherical polyacrylonitrile-carbon nanocomposite with high loading of sulfur for lithium-sulfur batteries

JOURNAL OF POWER SOURCES

卷:302

Article

Sohn, Hiesang¹  Gordin, Mikhail L.¹  Regula, Michael²  Kim, Dong Hyeon³  Jung, Yoon Seok³  Song, Jiangxuan¹  Wang, Donghai¹ 

[1] Penn State Univ, Dept Mech & Nucl Engn, University Pk, PA 16802 USA

[2] Penn State Univ, Dept Chem Engn, University Pk, PA 16802 USA

[3] UNIST, Sch Energy & Chem Engn, Ulsan 689798, South Korea

关键词: Li-S batteries;    Aerosol process;    Conductivity;    Porosity;    Chemical functionality;   

DOI  :  10.1016/j.jpowsour.2015.10.013

来源: Elsevier

【 摘 要 】

Pyrolyzed porous spherical composites of polyacrylonitrile-Ketjenblack carbon and sulfur (pPAN-KB/S) with a high sulfur content (ca. 72%) and enhanced conductivity and porosity (pore volume: 1.42 cm(3)/g; BET surface area: 727 m(2)/g) were prepared by an aerosol-assisted process and applied as cathode for lithium-sulfur batteries. Electrochemical tests showed that the pPAN-KB/S composite exhibited a high capacity of 866 mAh/g (based on sulfur) after 100 cycles at 0.5C (1C = 1.68 A/g) and a good rate performance at high current density (431 mAh/g at 5C). In addition, a pPAN-KB/S composite electrode with high sulfur loading (ca. 4.4 mg-S/cm(2)) exhibited impressive electrochemical performance with a reversible capacity of 513 mAh/g and 576 mAh/cm(3) (based on sulfur) and a coulombic efficiency >99% after 100 cycles at 0.5C. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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