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Positive electrode catalytic material of lithium-sulfur battery as well as preparation method and application of positive electrode catalytic material

A catalytic material, lithium-sulfur battery technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve insufficient suppression of shuttle effect, lack of catalytic ability, cycle stability and Coulombic efficiency have not been greatly improved, etc. problems, to achieve the effect of large-scale promotion, excellent catalytic effect, and wide source of raw materials

Pending Publication Date: 2022-08-05
山东大学深圳研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the insufficient inhibition of the shuttle effect of lithium polysulfide by the physical adsorption of carbon materials and the lack of catalytic ability, the life, cycle stability and Coulombic efficiency of lithium-sulfur batteries have not been greatly improved.

Method used

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  • Positive electrode catalytic material of lithium-sulfur battery as well as preparation method and application of positive electrode catalytic material
  • Positive electrode catalytic material of lithium-sulfur battery as well as preparation method and application of positive electrode catalytic material
  • Positive electrode catalytic material of lithium-sulfur battery as well as preparation method and application of positive electrode catalytic material

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Experimental program
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Embodiment 1

[0053] like figure 1 , Figure 10 As shown in the figure, the preparation method of a lithium-sulfur battery cathode based on phosphorus-doped cobalt selenide-carbon nanotube composite material, the preparation steps of the cathode material are as follows:

[0054] Step 1. The commercial carbon nanotubes are acidified with concentrated nitric acid, cooled, washed, and freeze-dried to obtain acidified carbon nanotubes. Step 2. 0.299g cobalt acetate tetrahydrate (C 4 H 6 CoO 4 ·4H 2 O) was dissolved in 12 mL of water, stirred at room temperature for 10 min, and configured into a 0.1 M cobalt acetate solution.

[0055] Step 3. Disperse 0.06 g of acidified carbon nanotubes and 210 mL of ethanol by ultrasonic for 60 min to form a suspension.

[0056] Step 4. Under the vigorous stirring of the magnetic stirrer, shake the burette to drop the cobalt acetate solution into the carbon nanotube suspension, then add 10 mL of ammonia water (25 wt%), and then fill the glass bottle with...

Embodiment 2

[0065] The preparation method of a lithium-sulfur battery positive electrode based on phosphorus-doped nickel selenide-carbon nanotube composite material, compared with the embodiment, the positive electrode does not include a phosphorus doping process, and the preparation steps of the positive electrode material are as follows:

[0066] Step 1: Acidify commercial carbon nanotubes with concentrated nitric acid, and obtain after cooling, washing, and freeze-drying.

[0067] Step 2. Mix 0.3489g of nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 0) Dissolve in 12 mL of water, stir at room temperature for 10 min, and configure into a 0.1 M nickel nitrate solution.

[0068] Step 3. Disperse 0.06 g of acidified carbon nanotubes and 210 mL of ethanol by ultrasonic for 60 min to form a suspension.

[0069] Step 4. Under the vigorous stirring of the magnetic stirrer, the nickel nitrate solution was added dropwise to the carbon nanotube suspension with a burette, and then 10 mL of ammo...

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Abstract

The invention provides a lithium-sulfur battery positive electrode catalytic material and a preparation method and application thereof, and belongs to the technical field of battery positive electrode materials. The positive electrode catalytic material of the lithium-sulfur battery is a composite material formed by in-situ growth of phosphorus-doped transition metal selenide on a conductive carbon material. The preparation method of the positive electrode catalytic material of the lithium-sulfur battery comprises the following steps: pre-treating a carbon material by using an in-situ growth method, soaking the pre-treated carbon material in a solution containing transition metal salt, reacting the pre-treated carbon material with the solution to separate out a solid product, and then carrying out high-temperature selenylation and doping treatment on the solid product to obtain the carbon composite material embedded with the phosphorus-doped transition metal selenide. The positive electrode material provided by the invention has the advantages of high preparation efficiency, less environmental pollution and low cost, can continue to use the existing processes of battery slurry mixing, coating, baking and the like, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of battery positive electrodes, and in particular relates to a lithium-sulfur battery positive electrode catalytic material and a preparation method and application thereof. Background technique [0002] Lithium battery is one of the most widely studied and widely used new energy energy storage devices. With the deepening of research on lithium batteries, the branch of lithium-sulfur batteries has shown promising performance in the field of electrochemical energy storage. In the positive electrode, sulfur has 1675mAh g -1 The theoretical capacity of , and in the negative electrode, lithium metal also has a higher specific capacity (3860mAh g -1 ). Therefore, compared to existing lithium-ion batteries (only 140-260Wh kg -1 ), the lithium-sulfur battery has a higher theoretical energy density of 2600Wh kg -1 . In addition, the natural reserves of active materials are abundant and environmentally friendly...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/136H01M10/39
CPCH01M4/62H01M4/624H01M4/625H01M4/628H01M4/136H01M10/39H01M2004/028Y02E60/10
Inventor 胡成陈传忠傅章华张安洲
Owner 山东大学深圳研究院