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Enhancement of long stability of Li-S battery by thin wall hollow spherical structured polypyrrole based sulfur cathode

Journal Article


Abstract


  • To enhance the long stability of sulfur cathode for a high-energy lithium-sulfur cell, a thin wall hollow spherical structured polypyrrole (T-HSSP) composed of a mono layer of PPy nano-particles is employed as a host to encapsulate the sulfur component. T-HSSP can buffer the volume expansion of sulfur during the discharge and charge processes; therefore can maintain the integrity of the sulfur electrode after long cycling. The distribution of sulfur component is maintained even after 100 charge/discharge cycles in T-HSSP, indicating the efficiency of the design in inhibiting the shuttle effect of the sulfur electrode. The composite with a sulfur content of 58.4 wt% exhibits a reversible capacity of 1563.3 mA h g-1 and a discharge capacity retention over 89% during 40-200 cycles, corresponding to a sulfur utilization rate of 89.2% at 0.2 C. The excellent rate capability of the composite is demonstrated by its cycling performances at 1 C, 2 C, and 5 C for 300 cycles. Moreover, a further heating treatment is carried out to inhibit the severe capacity fade in the initial tens of cycles, and an enhanced cycling stability of the Li-S battery is achieved.

UOW Authors


  •   Ma, Guoqiang (external author)
  •   Wen, Zhaoyin (external author)
  •   Jin, Jun (external author)
  •   Lu, Yan (external author)
  •   Wu, Xiangwei (external author)
  •   Liu, Cai (external author)
  •   Chen, Chunhua (external author)

Publication Date


  • 2014

Geographic Focus


Citation


  • Ma, G., Wen, Z., Jin, J., Lu, Y., Wu, X., Liu, C. & Chen, C. (2014). Enhancement of long stability of Li-S battery by thin wall hollow spherical structured polypyrrole based sulfur cathode. RSC Advances: an international journal to further the chemical sciences, 4 (41), 21612-21618.

Scopus Eid


  • 2-s2.0-84901624752

Number Of Pages


  • 6

Start Page


  • 21612

End Page


  • 21618

Volume


  • 4

Issue


  • 41

Place Of Publication


  • United Kingdom

Abstract


  • To enhance the long stability of sulfur cathode for a high-energy lithium-sulfur cell, a thin wall hollow spherical structured polypyrrole (T-HSSP) composed of a mono layer of PPy nano-particles is employed as a host to encapsulate the sulfur component. T-HSSP can buffer the volume expansion of sulfur during the discharge and charge processes; therefore can maintain the integrity of the sulfur electrode after long cycling. The distribution of sulfur component is maintained even after 100 charge/discharge cycles in T-HSSP, indicating the efficiency of the design in inhibiting the shuttle effect of the sulfur electrode. The composite with a sulfur content of 58.4 wt% exhibits a reversible capacity of 1563.3 mA h g-1 and a discharge capacity retention over 89% during 40-200 cycles, corresponding to a sulfur utilization rate of 89.2% at 0.2 C. The excellent rate capability of the composite is demonstrated by its cycling performances at 1 C, 2 C, and 5 C for 300 cycles. Moreover, a further heating treatment is carried out to inhibit the severe capacity fade in the initial tens of cycles, and an enhanced cycling stability of the Li-S battery is achieved.

UOW Authors


  •   Ma, Guoqiang (external author)
  •   Wen, Zhaoyin (external author)
  •   Jin, Jun (external author)
  •   Lu, Yan (external author)
  •   Wu, Xiangwei (external author)
  •   Liu, Cai (external author)
  •   Chen, Chunhua (external author)

Publication Date


  • 2014

Geographic Focus


Citation


  • Ma, G., Wen, Z., Jin, J., Lu, Y., Wu, X., Liu, C. & Chen, C. (2014). Enhancement of long stability of Li-S battery by thin wall hollow spherical structured polypyrrole based sulfur cathode. RSC Advances: an international journal to further the chemical sciences, 4 (41), 21612-21618.

Scopus Eid


  • 2-s2.0-84901624752

Number Of Pages


  • 6

Start Page


  • 21612

End Page


  • 21618

Volume


  • 4

Issue


  • 41

Place Of Publication


  • United Kingdom