能源化学(英文版)

能源化学(英文版) ›› 2020, Vol. 49 ›› Issue (10): 71-79.DOI: 10.1016/j.jechem.2020.01.031

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Highly integrated sulfur cathodes with strong sulfur/high-strength binder interactions enabling durable high-loading lithium-sulfur batteries

Arif Rashida, Xingyu Zhua, Gulian Wanga, Chengzhi Keb, Sha Lic, Pengfei Suna, Zhongli Hua, Qiaobao Zhangb, Li Zhanga   

  1. a College of Energy,Soochow Institute for Energy and Materials Innovations,Soochow University,Suzhou 215006,Jiangsu,China;
    b Department of Materials Science and Engineering,College of Materials,Xiamen University,Xiamen 361005,Fujian,China;
    c State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China
  • 收稿日期:2019-12-30 修回日期:2020-01-21 出版日期:2020-10-15 发布日期:2020-12-18
  • 通讯作者: Qiaobao Zhang, Li Zhang
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China(21875155,51675275,21703185 and 21473119).Q.B.Z.acknowledges the Leading Project Foundation of Science Department of Fujian Province(2018H0034)and Shenzhen Science and Technology Planning Project(JCYJ20170818153427106).

Highly integrated sulfur cathodes with strong sulfur/high-strength binder interactions enabling durable high-loading lithium-sulfur batteries

Arif Rashida, Xingyu Zhua, Gulian Wanga, Chengzhi Keb, Sha Lic, Pengfei Suna, Zhongli Hua, Qiaobao Zhangb, Li Zhanga   

  1. a College of Energy,Soochow Institute for Energy and Materials Innovations,Soochow University,Suzhou 215006,Jiangsu,China;
    b Department of Materials Science and Engineering,College of Materials,Xiamen University,Xiamen 361005,Fujian,China;
    c State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China
  • Received:2019-12-30 Revised:2020-01-21 Online:2020-10-15 Published:2020-12-18
  • Contact: Qiaobao Zhang, Li Zhang
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(21875155,51675275,21703185 and 21473119).Q.B.Z.acknowledges the Leading Project Foundation of Science Department of Fujian Province(2018H0034)and Shenzhen Science and Technology Planning Project(JCYJ20170818153427106).

摘要： The development of high-sulfur-loading Li-S batteries is a key prerequisite for their commercial applications.This requires to surmount the huge polarization,severe polysulfide shuttling and drastic volume change caused by electrode thickening.High-strength polar binders are ideal for constructing robust and long-life high-loading sulfur cathodes but show very weak interfacial interaction with non-polar sulfur materials.To address this issue,this work devises a highly integrated sulfur@polydopamine/highstrength binder composite cathodes,targeting long-lasting and high-sulfur-loading Li-S batteries.The super-adhesion polydopamine (PD) can form a uniform nano-coating over the graphene/sulfur (G-S) surface and provide strong affinity to the cross-linked polyacrylamide (c-PAM) binder,thus tightly integrating sulfur with the binder network and greatly boosting the overall mechanical strength/conductivity of the electrode.Moreover,the PD coating and c-PAM binder rich in polar groups can form two effective blockades against the effusion of soluble polysulfides.As such,the 4.5 mg cm-2 sulfur-loaded G-S@PD-c-PAM cathode achieves a capacity of 480 mAh g-1 after 300 cycles at 1 C,while maintaining a capacity of 396 mAh g-1 after 50 cycles at 0.2 C when the sulfur loading rises to 9.1 mg cm-2.This work provides a system-wide concept for constructing high-loading sulfur cathodes through integrated structural design.

关键词: Cross-linked high-strength polar binder, Highly integrated electrode structure, High-sulfur-loading Li-S battery, Polydopamine nano-bonding layer, Strong sulfur/binder interaction

Abstract: The development of high-sulfur-loading Li-S batteries is a key prerequisite for their commercial applications.This requires to surmount the huge polarization,severe polysulfide shuttling and drastic volume change caused by electrode thickening.High-strength polar binders are ideal for constructing robust and long-life high-loading sulfur cathodes but show very weak interfacial interaction with non-polar sulfur materials.To address this issue,this work devises a highly integrated sulfur@polydopamine/highstrength binder composite cathodes,targeting long-lasting and high-sulfur-loading Li-S batteries.The super-adhesion polydopamine (PD) can form a uniform nano-coating over the graphene/sulfur (G-S) surface and provide strong affinity to the cross-linked polyacrylamide (c-PAM) binder,thus tightly integrating sulfur with the binder network and greatly boosting the overall mechanical strength/conductivity of the electrode.Moreover,the PD coating and c-PAM binder rich in polar groups can form two effective blockades against the effusion of soluble polysulfides.As such,the 4.5 mg cm-2 sulfur-loaded G-S@PD-c-PAM cathode achieves a capacity of 480 mAh g-1 after 300 cycles at 1 C,while maintaining a capacity of 396 mAh g-1 after 50 cycles at 0.2 C when the sulfur loading rises to 9.1 mg cm-2.This work provides a system-wide concept for constructing high-loading sulfur cathodes through integrated structural design.

Key words: Cross-linked high-strength polar binder, Highly integrated electrode structure, High-sulfur-loading Li-S battery, Polydopamine nano-bonding layer, Strong sulfur/binder interaction