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Compound anode material, preparation method of compound anode material and all-solid lithium-sulphur battery

A composite cathode material and composite material technology, applied in the field of all-solid-state lithium-ion batteries, can solve the problems of poor cycle performance, low safety performance, and low capacity, and achieve the effects of improving electronic conductivity, solving the shuttle effect, and improving safety performance.

Active Publication Date: 2017-05-31
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] In view of the problems of poor cycle performance, low capacity, and low safety performance in the prior art lithium-sulfur batteries, the purpose is to provide a carbon-sulfur composite material that can fully react the active material sulfur, improve the utilization rate of sulfur, and obtain a high-rate lithium-sulfur battery. Composite cathode materials for all-solid-state lithium-sulfur batteries with discharge specific capacity, stable cycle performance and high safety performance

Method used

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  • Compound anode material, preparation method of compound anode material and all-solid lithium-sulphur battery
  • Compound anode material, preparation method of compound anode material and all-solid lithium-sulphur battery
  • Compound anode material, preparation method of compound anode material and all-solid lithium-sulphur battery

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Embodiment 1

[0029] Preparation of composite material reduced graphene oxide@sulfur-40: First, a carbon-sulfur composite material is synthesized. The reduced graphene oxide is mixed in a mixed solution of deionized water and absolute ethanol, and the reduced graphene oxide is better dispersed by ultrasonic for 30 minutes . Sublimated sulfur is then added to anhydrous ethylenediamine to form a thiamine solution. Under vigorous stirring, the thiamine solution was dropped in the reduced graphene oxide solution dropwise, and the color of the solution changed from black to dark green, and the deposition time was 2 minutes. The final product is obtained by filtering and washing several times. Dry for 12 hours at 60°C in a vacuum drying oven to obtain a carbon-sulfur composite material. The mass of sulfur in the prepared carbon-sulfur composite material accounts for 40% of the total mass, and the particle size of the sulfur nanoparticles is about 2 nm.

[0030] Preparation of cathode material: se...

Embodiment 2

[0033] Preparation of composite porous carbon@sulfur-40: firstly synthesize a carbon-sulfur composite material, mix the porous carbon in a mixed solution of deionized water and absolute ethanol, and sonicate the porous carbon for 30 minutes to better disperse the porous carbon. Sublimated sulfur is then added to anhydrous ethylenediamine to form a thiamine solution. Under vigorous stirring, drop the thiamine solution dropwise in the porous carbon solution, and it can be observed that the color of the solution changes from black to dark green, and the deposition time is 2 minutes. The final product is obtained by filtering and washing several times. Dry for 12 hours at 60°C in a vacuum drying oven to obtain a carbon-sulfur composite material. The mass of sulfur in the prepared carbon-sulfur composite material accounts for 40% of the total mass, and the particle size of the sulfur nanoparticles is 1 nm.

[0034] Graphitized carbon nanotubes are selected as conductive carbon mater...

Embodiment 3

[0037] Preparation of composite carbon nanotubes@sulfur-50: First, a carbon-sulfur composite is synthesized. The carbon nanotubes are first mixed in a mixed solution of deionized water and absolute ethanol, and ultrasonicated for 30 minutes to make the carbon nanotubes better dispersed. Sublimated sulfur is then added to anhydrous ethylenediamine to form a thiamine solution. Under vigorous stirring, drop the thiamine solution dropwise in the carbon nanotube solution. It can be observed that the color of the solution changes from black to dark green. The deposition time is 60 minutes. As the stirring time increases, the color will become brighter. The final product is obtained by filtering and washing several times. Dry for 12h at 60℃ in a vacuum drying oven. A carbon-sulfur composite material is obtained. The mass of sulfur in the prepared carbon-sulfur composite material accounts for 80% of the total mass. The sulfur nanoparticles have a particle size of 150nm.

[0038] Prep...

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Abstract

The invention provides a compound anode material, a preparation method of the compound anode material and an all-solid lithium-sulphur battery and belongs to the technical field of all-solid lithium ion batteries. The compound anode material is prepared from the following ingredients (in parts by weight): 10-90 parts of carbon-sulfur composite, 10-80 parts of Li10GeP2S12 electrolyte and 1-80 parts of conductive carbon material, wherein the carbon-sulfur composite comprises a carbon material and sulfur; and the sulfur is located on the surface of the carbon material. The compound anode material has the advantages of high rate specific discharge capacity, stable cycle performance and higher safety performance.

Description

Technical field [0001] The invention relates to the technical field of all-solid-state lithium-ion batteries, in particular to a composite anode material, a preparation method of the composite anode material, and an all-solid-state lithium-sulfur battery. Background technique [0002] With the rapid development of new energy technology, lithium-ion batteries have been widely used in many fields such as military and national defense, electric vehicles, and portable digital devices. At the same time, the requirements for their performance are also getting higher and higher, especially their safety performance, Energy density puts forward higher requirements, and the low specific capacity of traditional lithium-ion battery cathode materials has become its biggest limiting factor. Elemental sulfur, which is the cathode material of lithium-sulfur batteries, has attracted widespread attention due to its high theoretical specific capacity of 1672mAh / g and specific energy of 2567Wh / Kg. ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/364H01M4/38H01M4/62H01M4/625H01M10/052Y02E60/10
Inventor 许晓雄黄宁姚霞银蔡梁婷
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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