Positive electrode of lithium-sulfur cell and lithium-sulfur cell including said positive electrode
A lithium-sulfur battery and cathode technology, applied in the field of lithium-sulfur batteries, can solve the problems of inactive materials of active materials, reduction of battery capacity, reduction of charge and discharge efficiency, etc.
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Embodiment 1
[0041] Prepare the binder solution by dissolving polyvinyl acetate in acrylonitrile. Carbon powder (special grade P) conductive agent was added to the binder solution to obtain a dispersion solution. Sulfur powder ground to an average diameter of about 20 μm was added to the dispersion solution, and the dispersion solution was stirred by a ball mill for more than 24 hours. A cathode active material slurry was prepared from the stirred dispersion solution. In the positive electrode active material slurry, the weight ratio of sulfur:binder:conductive agent was 60:20:20.
[0042] The cathode active material slurry was coated on the nickel foam with a porosity of 80%, and the slurry-coated nickel foam was dried at 60° C. for 1 hour. The dried slurry-coated nickel foam was pressed to a thickness of 50 μm by a roller press to prepare a positive electrode.
Embodiment 2
[0044] A positive electrode was prepared by the same method as in Example 1 except that the current collector was a nonwoven fiber coated with nickel and having a porosity of 80%.
Embodiment 3
[0046] A positive electrode was prepared by the same method as in Example 1 except that a current collector with a porosity of 80% was used.
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