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Journal article

Sulfur Composite Cathode Materials for Rechargeable Lithium Batteries

Wang J, Yang J, Wan C, Du K, Xie J, Xu N ...see all

Advanced Functional Materials, vol. 13, issue 6 (2003) pp. 487-492

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Abstract

Conductive polymer/sulfur composite materials were prepared by heating the mixture of polyacrylonitrile (PAN) and sublimed sulfur. During the heating process, PAN was dehydrogenated by sulfur, forming a conductive main chain similar to polyacetylene. At the same time, the high-polarity functional group –CN cyclized at the melt state, forming a thermally stable heterocyclic compound in which sulfur was embedded. The nanodispersed composites showed excellent electrochemical properties. Tested as cathode material in a non-aqueous lithium cell based on poly(vinylidene fluoride) (PVDF) gel electrolyte at room temperature, the composite exhibited a specific capacity up to 850 mA h g–1 in the initial cycle. Its specific capacity remained above 600 mA h g–1 after 50 cycles, about five times that of LiCoO2, and recovered partly after replacement of the anode with a fresh lithium sheet. The utilization of the electrochemically active sulfur was about 90 % assuming a complete reaction to the product, Li2S.

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Authors

  • J. Wang

  • J. Yang

  • C. Wan

  • K. Du

  • J. Xie

  • N. Xu

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