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Strong affinity of polysulfide intermediates to multi-functional binder for practical application in lithium-sulfur batteries

Journal Article


Abstract


  • Binder, one of the most important battery components, plays a critical role in lithium-sulfur batteries. Poly(vinylidene difluoride) (PVDF), a commonly used binder in lithium-sulfur batteries, does not have a strong affinity to the intermediate polysulfides, however, leading to fast capacity fading with electrochemical cycling. Herein, copolymers of vinylidene difluoride with other monomers are used as multi-functional binders to enhance the electrochemical performance of lithium-sulfur batteries. Compared to the PVDF, the copolymer, poly(vinylidene difluoride-trifluoroethylene) (P(VDF-TRFE)) binder exhibits higher adhesion strength, less porosity, and stronger chemical interaction with polysulfides, which helps to keep the polysulfides within the cathode region, thereby improving the electrochemical performance of the lithium-sulfur battery. As a result, sulfur electrode with P(VDF-TRFE) binder delivered a high capacity of 801 mA h g-1 at 0.2 C after 100 cycles, which is nearly 80% higher capacity than the corresponding sulfur cathode with PVDF binder.

Authors


Publication Date


  • 2016

Citation


  • Wang, H., Sencadas, V., Gao, G., Gao, H., Du, A., Liu, H. & Guo, Z. (2016). Strong affinity of polysulfide intermediates to multi-functional binder for practical application in lithium-sulfur batteries. Nano Energy, 26 722-728.

Scopus Eid


  • 2-s2.0-84976361925

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2193

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 722

End Page


  • 728

Volume


  • 26

Place Of Publication


  • Netherlands

Abstract


  • Binder, one of the most important battery components, plays a critical role in lithium-sulfur batteries. Poly(vinylidene difluoride) (PVDF), a commonly used binder in lithium-sulfur batteries, does not have a strong affinity to the intermediate polysulfides, however, leading to fast capacity fading with electrochemical cycling. Herein, copolymers of vinylidene difluoride with other monomers are used as multi-functional binders to enhance the electrochemical performance of lithium-sulfur batteries. Compared to the PVDF, the copolymer, poly(vinylidene difluoride-trifluoroethylene) (P(VDF-TRFE)) binder exhibits higher adhesion strength, less porosity, and stronger chemical interaction with polysulfides, which helps to keep the polysulfides within the cathode region, thereby improving the electrochemical performance of the lithium-sulfur battery. As a result, sulfur electrode with P(VDF-TRFE) binder delivered a high capacity of 801 mA h g-1 at 0.2 C after 100 cycles, which is nearly 80% higher capacity than the corresponding sulfur cathode with PVDF binder.

Authors


Publication Date


  • 2016

Citation


  • Wang, H., Sencadas, V., Gao, G., Gao, H., Du, A., Liu, H. & Guo, Z. (2016). Strong affinity of polysulfide intermediates to multi-functional binder for practical application in lithium-sulfur batteries. Nano Energy, 26 722-728.

Scopus Eid


  • 2-s2.0-84976361925

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2193

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 722

End Page


  • 728

Volume


  • 26

Place Of Publication


  • Netherlands