Method for preparing lithium-sulfur battery by taking graphitized carbon nanotube flexible film as current collector of lithium-sulfur battery
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A lithium-sulfur battery, graphitized carbon technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve problems such as poor conductivity, shedding, and impact on battery life
Inactive Publication Date: 2017-02-01
NANCHANG UNIV
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However, since sulfur is a non-conductive substance, the conductivity is very poor, and carbon nanotubes have excellent conductivity due to the SP2 hybridization that produces a large number of delocalized π electrons.
The traditional aluminum foil and pole piece have a phenomenon of falling off during multiple cycles, which has a certain impact on the life of the battery
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Embodiment 1
[0022] (1) Take 100g of carbon nanotubes, heat it in the graphitization furnace at 2300°C for 20h, and take it out.
[0023] (2) The carbon nanotubes are ball milled at 300r / min for 3h to a fine and compact powder.
[0024] (3) Using NMP as the solvent and carbon nanotubes (CNTs) as the basic material, the mass ratio of CNTs:PVDF:SDS is 91:5:4, the solid content is adjusted to 4%, the high-speed shearing is 2h, and the pulp is made.
[0025] (4) Choose aluminum foil as the base material, take 10ml of slurry, and coat it into 5x8cm 2 The area is dried at 50℃ to form a film.
[0026] (5) Soak the aluminum foil module in the hydrochloric acid solution for 24 hours to completely corrode the substrate, and take it out carefully to dry.
[0027] (6) Carbonize the prepared CNTs film at 900°C, graphitize it at 2300°C, and take it out for rolling. And after carbonization and graphitization, the impurity content is low, and the crystallinity of CNTs is improved.
[0028] (7) The mass ratio is sul...
Embodiment 2
[0031] (1) Take 100g of carbon nanotubes, keep them in a graphitization furnace at 3000°C for 16h, and take them out.
[0032] (2) The carbon nanotubes are ball milled at 200r / min for 6h to a fine and compact powder.
[0033] (3) Using ethanol as the solvent and carbon nanotubes (CNTs) as the basic material, the mass ratio of CNTs:PVDF:SDBS is 96:2:2, the solid content is adjusted to 2%, the high-speed shear is 1h, and the pulp is made.
[0034] (4) Choose copper foil as the base material, take 10ml of slurry, and coat it into 5x8cm 2 The area is dried at 50℃ to form a film.
[0035] (5) Soak the copper foil module in a concentrated nitric acid solution for 10 hours to completely corrode the substrate, and take it out carefully to dry.
[0036] (6) The prepared CNTs film is carbonized at 1000°C, graphitized at 3000°C, and taken out and compacted. And after carbonization and graphitization, the impurity content is low, and the crystallinity of CNTs is improved.
[0037] (7) The mass rati...
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Abstract
A method for preparing a lithium-sulfur battery by taking a graphitized carbon nanotube flexible film as a current collector of the lithium-sulfur battery comprises the following steps of (1) taking sulfur as an active material, adding a conductive agent and a binding agent, taking N-methylpyrrolidone or deionized water as a solvent, and mixing paste; (2) coating the active material subjected to paste mixing already on the graphitized carbon nanotube flexible film, performing drying after coating, cutting the graphitized carbon nanotube flexible film to a product with the same size as a negative pole plate, and performing vacuum drying to obtain a positive pole plate; and (3) taking a lithium sheet as the negative pole plate, adding an electrolyte in a vacuum glove box, and assembling the battery according to a sequence of a negative electrode shell, the negative pole plate, a separator, the positive pole plate, foamed nickel and a positive electrode shell. The nanotube flexible film has a large amount of micropores with different sizes, the sulfur are very favorably deposited and absorbed into the micropores, thus, sulfur loading quantity in the positive pole plate and electrochemical reaction interface area are effectively increased, electron and ion conduction are enhanced, and the charge/discharge performance of the lithium-sulfur battery can be substantially improved.
Description
Technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and relates to a lithium-sulfur battery with a graphitized carbon nanotube flexible film as a current collector. Background technique [0002] With the development of the economy, more and more environmental problems have emerged. Electric vehicles will become the next generation of transportation for people, but the breakthrough of electric vehicles requires a breakthrough in battery technology. High energy density is the focus of future development. Lithium-sulfur battery is a very promising battery. The theoretical specific capacity of sulfur can reach 1672mAh / g, and the theoretical energy density of the battery composed of lithium negative electrode can reach 2600Wh / kg, and elemental sulfur has the advantages of cheap and non-toxic. However, because sulfur is a non-conductive substance, the conductivity is very poor. Carbon nanotubes generate a large number of delocalized π elect...
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