Molybdenum carbide sulfur composite material and preparation method and application thereof

A composite material, molybdenum carbide technology, used in electrical components, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of unsatisfactory cycle performance and service life of carbon-sulfur composites, weak interaction, etc., and achieve good cycle stability. sexual effect

Active Publication Date: 2018-03-13
吉林省东驰新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the interaction between carbon materials and polysulfides in the existing carbon-sulfur composites is weak. As the cycle progresses and the number of cycles increases, polysulfides will still diffuse into the electrolyte, resulting in the cycle of carbon-sulfur composites. Performance and service life cannot be satisfied

Method used

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  • Molybdenum carbide sulfur composite material and preparation method and application thereof
  • Molybdenum carbide sulfur composite material and preparation method and application thereof
  • Molybdenum carbide sulfur composite material and preparation method and application thereof

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preparation example Construction

[0032] The present invention also provides a preparation method for the above-mentioned molybdenum carbide-sulfur composite material, comprising the following steps:

[0033] 1) after molybdenum trioxide raw material, hydrogen peroxide and nitric acid solution are mixed, obtain rod-shaped molybdenum trioxide through hydrothermal treatment;

[0034] 2) mixing the rod-shaped molybdenum trioxide, carbon precursor material and solvent, and performing a reduction reaction under a protective atmosphere to obtain molybdenum carbide;

[0035] 3) mixing the molybdenum carbide and sulfur element, and performing heat treatment under a protective atmosphere to obtain a molybdenum carbide-sulfur composite material.

[0036] The invention mixes molybdenum trioxide raw material, hydrogen peroxide and nitric acid solution to obtain a mixed solution. The present invention does not have special requirements for the source of molybdenum trioxide raw material, hydrogen peroxide and nitric acid s...

Embodiment 1

[0060] Prepare a mixed solution (0.3g / ml hydrogen peroxide 20ml, 0.65g / ml nitric acid solution 10ml), add 0.4g molybdenum trioxide to the mixed solution and stir for 72 hours at a stirring rate of 500r / min; then hydrothermally treat at 190°C for 36 hours, cooled to room temperature, centrifuged, filtered, and dried at 70°C to obtain rod-shaped molybdenum trioxide;

[0061] Disperse the above-prepared rod-shaped molybdenum trioxide and phenolic resin in 40ml of ethanol solvent at a mass ratio of 2:1, stir at 40°C for 28 hours, and dry at 80°C to obtain a solid mixed powder. Mix the solid powder in N 2 Sintering in a protected high-temperature furnace, at a heating rate of 5°C / min, raised to 900°C for sintering reaction for 18 hours, and naturally cooled to room temperature to obtain molybdenum carbide;

[0062] The prepared molybdenum carbide and sulfur element were ball milled in a ball mill for 4 hours according to the mass ratio of 2:3, and the product was 2 In a protected...

Embodiment 2

[0065] Preparation of lithium-sulfur battery: mix the molybdenum carbide-sulfur composite material prepared in Example 1 with acetylene black and PVDF at a mass ratio of 8:1:1, and use N-methylpyrrolidone as a solvent to make a uniform slurry (solid content 50%), and coated on the aluminum foil, dried to obtain the positive sheet, in the argon-protected glove box, with metal lithium as the negative electrode, 1M LiTFSI, 0.1M LiNO 3 (DOL and DME are solvents with a volume ratio of 1:1) as the electrolyte and assembled into a button lithium-sulfur battery.

[0066] Cycle performance test: at a constant temperature of 30°C, within a voltage range of 1.5-3.0V, a charge-discharge test is performed at a current density of 1C, and the cycle is 500 times.

[0067] Depend on figure 2 The cycle performance curve of the positive electrode material shown shows that after 500 cycles, it still maintains a reversible capacity of 653mAh / g, and after 500 cycles at a 1C rate, the retention ca...

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Abstract

The invention relates to the technical field of a lithium-sulfur battery positive electrode material, and provides a molybdenum carbide sulfur composite material and preparation method and applicationthereof. The molybdenum carbide sulfur composite material comprises molybdenum carbide and elemental sulfur, wherein the molybdenum carbide is of a porous rod-shaped structure, the length of the molybdenum carbide is 1-5 micrometers, the diameter of the molybdenum carbide is 30-60 nanometers, the elemental sulfur is doped into gaps of the molybdenum carbide, and the mass ratio of the molybdenum carbide and the elemental sulfur is (1-9):(9-1). The molybdenum carbide sulfur composite material provided by the invention has relatively high specific area and electron conductivity, the sulfur utilization ratio can be improved, and a shuttle flying effect is relieved. Through charge-discharge test on a lithium-sulfur battery prepared by the molybdenum carbide sulfur composite material, reversible capacity of (623-653) mAh/g still can be maintained after circulation for 500 times, the capacity is maintained at 70% or above, the lithium-sulfur battery has coulobmic efficiency exceeding 93%, and the cycle property can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium-sulfur batteries, in particular to a molybdenum carbide-sulfur composite material and a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of electric vehicles and energy storage devices, it is difficult for current commercial lithium-ion batteries to meet people's demand for high energy density. Lithium-sulfur batteries are considered to be one of the candidates for next-generation batteries due to their high energy density and low cost. However, due to the low electronic conductivity of sulfur, the dissolution of polysulfides in the electrolyte, the large volume change during cycling leads to the shuttle effect, the low utilization of sulfur, and the poor cycle stability, all of which restrict lithium-sulfur batteries. practical application. [0003] In the prior art, such as Ti 4 o 7 Composite with pola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M10/052
CPCH01M4/362H01M4/38H01M4/58H01M10/052Y02E60/10
Inventor 谢海明王钊孙立群刘佳丛丽娜
Owner 吉林省东驰新能源科技有限公司
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