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Preparation method and application of sulfur-doped g-C3N4/alpha-ZrP-carbonized ZIF-8 positive electrode material

A technology of ZIF-8 and positive electrode materials, applied in the direction of positive electrodes, battery electrodes, electrochemical generators, etc., can solve the problems of large volume expansion, low actual capacity, long-chain polysulfide shuttle effect, etc., to promote transformation, Improvement of low capacity, improvement of coulombic efficiency and lifetime

Inactive Publication Date: 2021-01-08
程信强
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of low actual capacity, large volume expansion and long-chain polysulfides caused by elemental sulfur as the positive electrode, the present invention provides a sulfur-doped g-C 3 N 4 Preparation method and application of α-ZrP-carbonized ZIF-8 cathode material

Method used

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  • Preparation method and application of sulfur-doped g-C3N4/alpha-ZrP-carbonized ZIF-8 positive electrode material
  • Preparation method and application of sulfur-doped g-C3N4/alpha-ZrP-carbonized ZIF-8 positive electrode material
  • Preparation method and application of sulfur-doped g-C3N4/alpha-ZrP-carbonized ZIF-8 positive electrode material

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Embodiment 1

[0021] Step 1: Add 1.68g of melamine, 12g of urea and 4g of SBA-15 molecular sieve into 50ml of deionized water, stir in a water bath at 60°C for 60min, then dry and grind in a vacuum oven at 70°C, then mix the ground The powder was placed in a tube furnace at N 2 Under the protection of the atmosphere, the temperature was raised to 560°C at a rate of 2°C / min, calcined for 4h, and after cooling to room temperature, the sample was ground again and soaked in a mixed solution of 44.5ml of 5% hydrofluoric acid and 5.5ml of ethanol for 24h. The samples were then lyophilized to obtain mesoporous g-C 3 N 4 powder.

[0022] Step 2: Dissolve 2.74g of zinc nitrate and 6.18g of 2-methylimidazole in 40mL of methanol respectively, and then add the two solutions simultaneously to the solution containing 12.3g of mesoporous g-C 3 N 4 In 50ml methanol of the powder, the mixture was sonicated at room temperature for 4h and then sealed and aged for 30h, then the solution was centrifuged and...

Embodiment 2

[0026] Step 1: Add 2.52g of melamine, 18g of urea and 4.5g of SBA-15 molecular sieve into 50ml of deionized water, stir in a water bath at 70°C for 40min, then dry and grind in a vacuum oven at 80°C, and then put the ground The mixed powders were placed in a tube furnace at N 2Under the protection of the atmosphere, the temperature was raised to 560°C at a rate of 2°C / min, calcined for 6h, and after cooling to room temperature, the sample was ground again and soaked in a mixed solution of 46.2ml of 5% hydrofluoric acid and 3.8ml of ethanol for 18h. The samples were then lyophilized to obtain mesoporous g-C 3 N 4 powder.

[0027] Step 2: Dissolve 2.65g of zinc nitrate and 5.8g of 2-methylimidazole in 40mL of methanol respectively, and then add the two solutions simultaneously to the solution containing 16.4g of mesoporous g-C 3 N 4 In 50ml methanol of the powder, the mixture was sonicated at room temperature for 3h and then sealed and aged for 24h, then the solution was cen...

Embodiment 3

[0031] Step 1: Add 2.85g of melamine, 15g of urea and 4.2g of SBA-15 molecular sieve into 50ml of deionized water, stir in a water bath at 68°C for 45min, then dry and grind in a vacuum oven at 75°C, then put the ground The mixed powders were placed in a tube furnace at N 2 Under the protection of the atmosphere, the temperature was raised to 560°C at a rate of 2°C / min, and calcined for 5.5 hours. After cooling to room temperature, the sample was ground again and soaked in 45ml of 5% hydrofluoric acid and 5ml ethanol mixed solution for 20h. After soaking The samples were lyophilized to obtain mesoporous g-C 3 N 4 powder.

[0032] Step 2: 3.21g of zinc nitrate and 7.39g of 2-methylimidazole were dissolved in 40mL of methanol, and then the two solutions were simultaneously added to the solution containing 16.1g of mesoporous g-C 3 N 4 In 50ml of methanol powder, the mixture was sonicated at room temperature for 3.2h, sealed and aged for 28h, then the solution was centrifuged...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a preparation method and application of a sulfur-doped g-C3N4 / alpha-ZrP-carbonized ZIF-8 positiveelectrode material. The preparation method comprises the following steps: firstly, preparing mesoporous g-C3N4 by taking SBA-15 as a template agent and melamine and urea as raw materials; and using zinc nitrate, zirconium oxychloride octahydrate, 2-methylimidazole and phosphoric acid as raw materials to load carbonized ZIF-8 and alpha-ZrP nanosheets on g-C3N4, and finally doping elemental sulfur to prepare the positive electrode material. According to the prepared positive electrode material, the capacity of the lithium-sulfur battery is improved, large volume expansion of the elemental sulfurpositive electrode is avoided, and the shuttle effect caused by long-chain polysulfide is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, in particular to a sulfur-doped g-C 3 N 4 / α-ZrP-carbonized ZIF-8 cathode material preparation method and its application. Background technique [0002] Lithium-sulfur battery is a type of lithium battery, specifically a lithium battery that uses sulfur as the positive electrode of the battery and metal lithium as the negative electrode. Elemental sulfur is abundant in the earth and has the characteristics of low price and environmental friendliness. The lithium-sulfur battery using sulfur as the positive electrode material has a higher theoretical specific capacity of the material and a higher theoretical specific energy of the battery, and its battery capacity is much larger than that of the lithium cobalt oxide battery widely used in commerce. Moreover, sulfur is an environmentally friendly element that basically has no pollution to the environment; elemental sulfur is abun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052H01M10/42
CPCH01M4/625H01M4/628H01M10/052H01M10/4235H01M2004/028Y02E60/10
Inventor 程信强张兰兰
Owner 程信强
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