A kind of flexible lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery, flexible technology, applied in lithium batteries, battery electrodes, secondary batteries, etc., can solve the problems of uncontrollable, weak adsorption, low sulfur content, etc., to improve capacity and rate performance, improve adsorption and limit. Domain, the effect of avoiding the exfoliation of sulfur

Active Publication Date: 2021-06-22
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

The literature (Adv Mater, 2016, 28(43), 9629) first deposits sulfur nanoparticles on the surface of graphene in situ to form a mixed solution, and then forms a film by suction filtration, and winds the film to form a long-fiber sulfur electrode, but this The fiber electrode prepared by this method is limited by the size of the film and cannot form a continuous long fiber electrode.
The literature (Nano Energy 33(2017) 325-333) used a fiber bundle composed of stainless steel wire as a substrate, and then dipped it into a graphene-sulfur nanoparticle solution, and relied on van der Waals force to adsorb graphene-sulfur to the surface of the stainless steel wire, and prepared sulfur However, the sulfur content loaded by this method is very small and uncontrollable, and it is difficult to form a sulfur fiber electrode with a high sulfur loading rate. Moreover, the graphene-sulfur material is adsorbed to the surface of the stainless steel wire by van der Waals force, and the adsorption force is relatively low. Weak and easy to fall off, resulting in low cycle stability of lithium-sulfur batteries

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  • A kind of flexible lithium-sulfur battery and preparation method thereof
  • A kind of flexible lithium-sulfur battery and preparation method thereof
  • A kind of flexible lithium-sulfur battery and preparation method thereof

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preparation example Construction

[0028] The invention provides a method for preparing a flexible lithium-sulfur battery, comprising the following steps:

[0029] heat-treating the sulfur with the modified material to obtain a sulfur composite material; the modified material includes one or more of transition metal carbides, manganese dioxide, graphene and porous carbon;

[0030] mixing and dispersing the sulfur composite material, carbon nanotubes, surfactant and water to obtain a spinning stock solution;

[0031] Using the spinning stock solution to prepare fiber filaments by a coagulation bath spinning method, removing the coagulation bath solution components in the fiber filaments to obtain long-fiber sulfur carbon positive electrodes;

[0032] Coating the surfaces of the long-fiber sulfur-carbon positive electrode and the lithium metal wire negative electrode with a polygel electrolyte, respectively, to obtain a coated positive electrode and a coated negative electrode;

[0033] The coated positive elect...

Embodiment 1

[0059] According to sulfur accounting for 70% of the total mass of sulfur and the modified material, the modified material MXene (selected Ti 3 C 2 ) was mixed with sulfur element in a mortar, put into a glass tube filled with argon, sealed and then heat-treated in a tube furnace at 155°C for 48 hours to obtain a sulfur composite material;

[0060] According to the mass ratio of sulfur composite material and carbon nanotubes as 3:1, and the mass ratio of carbon nanotubes and surfactant as 1:5, the obtained sulfur composite material, carbon nanotubes, surfactant sodium deoxycholate and deionized Mix with water, and then ultrasonically disperse with a 500W probe to obtain a spinning dope with a solid content of 1%;

[0061] Take chitosan acetic acid solution as coagulation bath solution, wherein the massfraction of chitosan is 5%, and the massfraction of acetic acid is preferably 1%; figure 1 Spinning equipment with the structure shown, put the spinning stock solution and the ...

Embodiment 2

[0066] According to the fact that sulfur accounts for 80% of the total mass of sulfur and the modified material, the modified material graphene and sulfur element are mixed in a mortar, put into a glass tube filled with argon, and heat-treated in a tube furnace at 155°C for 48 hours after sealing. Obtain sulfur composite material;

[0067]According to the mass ratio of sulfur composite material and carbon nanotubes as 4:1, and the mass ratio of carbon nanotubes and surfactant as 1:5, the obtained sulfur composite material, carbon nanotubes, surfactant dodecane and deionized water were Mix, and then ultrasonically disperse with a 500W probe to obtain a spinning dope with a solid content of 2%;

[0068] Take chitosan acetic acid solution as coagulation bath solution, wherein the mass fraction of chitosan is 8%, the mass fraction of acetic acid is preferably 1%; Inject the spinning stock solution and coagulation bath solution into a glass tube with an inner diameter of 40 μm thr...

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Abstract

The invention belongs to the technical field of batteries, in particular to a flexible lithium-sulfur battery and a preparation method thereof. The invention provides a method for preparing a flexible lithium-sulfur battery, comprising the following steps: heat-treating after mixing sulfur with one or more modification materials including transition metal carbide, manganese dioxide, graphene and porous carbon to obtain a sulfur composite material; mixing and dispersing the sulfur composite material, carbon nanotubes, surfactant and water to obtain a spinning stock solution; spinning the spinning stock solution by coagulation bath spinning to obtain a long-fiber sulfur-carbon positive electrode; The surfaces of the long-fiber sulfur carbon positive electrode and the lithium metal wire negative electrode are respectively coated with polygel electrolyte to obtain a coated positive electrode and a coated negative electrode; Shrunk the tube and packaged to obtain the flexible lithium-sulfur battery. The test results show that the flexible lithium-sulfur battery provided by the invention has excellent electrical stability and flexible bending performance.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to a flexible lithium-sulfur battery and a preparation method thereof. Background technique [0002] Lithium-sulfur battery is a kind of lithium battery, which uses sulfur as the positive electrode of the battery and metal lithium as the negative electrode. Due to elemental sulfur (10 -30 S / cm) and the conductivity of its discharge products are extremely low, resulting in the actual capacity and energy density of lithium-sulfur batteries being far below their theoretical values; in addition, polysulfides produced during the discharge process will dissolve in large amounts in ether electrolytes, Diffusion through the diaphragm to the negative electrode area and deposition on the surface of metal lithium, resulting in the loss of active components, resulting in a "shuttle effect", making the coulombic efficiency and cycle life of lithium-sulfur batteries low, and the electrical per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M4/134H01M4/1395H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0566
CPCH01M4/134H01M4/1395H01M4/364H01M4/366H01M4/38H01M4/382H01M4/587H01M4/625H01M10/052H01M10/0566H01M2300/0085Y02E60/10
Inventor 王凯马衍伟
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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