Negative electrode for lithium-sulfur battery and lithium-sulfur battery comprising same
A lithium-sulfur battery and negative electrode technology, applied in the field of lithium-sulfur batteries, can solve the problems of not considering the performance degradation and damage of the negative electrode, lithium-sulfur batteries are difficult to ensure battery performance and operation stability, and the effect is not enough, and achieve the effect of excellent life characteristics
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[0147] Hereinafter, in order to facilitate understanding of the present invention, preferred examples of the present invention will be described. However, it will be apparent to those skilled in the art that the following examples are merely illustrative of the present invention and that various changes and modifications can be made within the scope and spirit of the invention and that such changes and modifications are set forth in the appended claims within the scope of the book.
[0148] Examples and Comparative Examples
Embodiment 1
[0150] The surface of the oxidized copper film was reduced and the copper surface was pre-faced by flowing 300 seem of argon and 50 seem of hydrogen through a 20 μm thick copper current collector at a temperature of 1035° C. for 20 minutes . Thereafter, 20 sccm of methane gas was additionally injected at 1035° C., and chemical vapor deposition was performed at a roll-to-roll moving speed set to 6 m / hr to prepare a graphene-containing material having 1.0 Å on both sides. A copper current collector with a protective layer of nm thickness.
Embodiment 2
[0152] A lithium metal foil having a thickness of 45 μm was placed on one side of the copper current collector with a protective layer obtained in Example 1, and pressed with a roll press to prepare a negative electrode.
[0153] 90% by weight of sulfur-carbon composite material (S / C 7:3 parts by weight) as the positive active material, 5% by weight of Deco black as the conductive material, and 5% by weight of styrene-butadiene rubber / carboxymethyl cellulose ( SBR / CMC 7:3) was mixed to prepare a positive electrode slurry composition.
[0154] Then, the prepared positive electrode slurry composition was coated on an aluminum current collector, dried at 50° C. for 12 hours, and compressed with a roll press to prepare a positive electrode.
[0155] The prepared negative and positive electrodes were placed opposite each other in a CR2032 coin cell, and a polyethylene separator with a thickness of 16 μm and a porosity of 68% was interposed between them, and then 70 μl of electrolyt...
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