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Preparation method and application of modified thin-wall hierarchical porous carbon for lithium-sulfur battery

A lithium-sulfur battery, multi-level hole technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of not eliminating the source of lithium dendrites, delaying the time of lithium dendrite occurrence, etc., to improve the passivation effect, The effect of suppressing shuttle and large specific surface area

Inactive Publication Date: 2019-08-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the coating of traditional carbon materials only delays the occurrence of lithium dendrites, but does not eliminate the root of the lithium dendrite problem.

Method used

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  • Preparation method and application of modified thin-wall hierarchical porous carbon for lithium-sulfur battery
  • Preparation method and application of modified thin-wall hierarchical porous carbon for lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment one: cobalt nitrate thiourea ligand solution

[0043] Thiourea (1.52g, 0.02mol) was dissolved in 4 times its mass of deionized water (6.08g) to obtain a thiourea solution, and hexahydrate cobalt nitrate (2.91g, 0.01mol) was dissolved in its 10 times its mass of deionized water (29.1g) to obtain a cobalt nitrate solution, the cobalt nitrate solution was slowly added to the thiourea solution, stirred for 2h to obtain a cobalt nitrate thiourea ligand solution, and the molar ratio of cobalt nitrate to thiourea was 1:2.

Embodiment 2

[0044] Example 2: Prepolymerization of Nickel Coordination Glucose Thiourea Resin

[0045] Thiourea (2.28g, 0.03mol) was dissolved in deionized water (9.12g) to obtain thiourea solution, and nickel chloride hexahydrate (2.38g, 0.01mol) was dissolved in deionized water (23.8g) to obtain nickel chloride solution, nickel chloride solution was slowly added to thiourea solution, and stirred for 2 hours to obtain nickel chloride thiourea ligand solution, the molar ratio of nickel chloride to thiourea was 1:3.

[0046] Sodium chloride (1.75 g, 0.03 mol) was dissolved in 7 mL of deionized water to obtain a sodium chloride solution. 5.94 g (0.03 mol) of glucose monohydrate was dissolved in 5.94 mL of deionized water to obtain a glucose solution. Add the above-mentioned nickel chloride thiourea ligand solution into the glucose solution, the molar ratio of glucose to thiourea is 1:1, place in a water bath at 85°C, add 10wt% hydrochloric acid dropwise and fully stir to make the pH value ...

Embodiment 3

[0047] Example 3: Preparation of nano-tin sulfide modified thin-walled hierarchical porous carbon

[0048] Thiourea (3.04g, 0.04mol) was dissolved in deionized water (12.16g) to obtain thiourea solution, and stannous chloride dihydrate (2.26g, 0.01mol) was dissolved in deionized water (22.6g) to obtain chlorinated For stannous solution, slowly add stannous chloride solution into thiourea solution, stir for 2 hours to obtain stannous chloride thiourea ligand solution, the molar ratio of stannous chloride to thiourea is 1:4.

[0049] Sodium chloride (11.69 g, 0.2 mol) was dissolved in 46.76 mL of deionized water to obtain a sodium chloride solution. 7.93 g (0.04 mol) of glucose monohydrate was dissolved in 7.93 mL of deionized water to obtain a glucose solution. Add the above stannous chloride thiourea ligand solution into the glucose solution, the molar ratio of glucose and thiourea usage is 1:1, put it in a water bath at 85°C, add 10wt% hydrochloric acid dropwise and fully st...

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Abstract

The invention relates to a lithium-sulfur battery technology, and aims to provide a preparation method and application of modified thin-wall hierarchical porous carbon for a lithium-sulfur battery. According to the invention, sodium chloride is taken as a template, water-soluble transition metal salt is taken as a modifier, water-soluble glucose thiourea resin is taken as a carbon source, and themodified thin-wall porous carbon forming nano sulfide on a carbon wall is obtained through freeze drying, calcination and water washing through flash freezing of a mixed solution, coordinated with transition metal, of a glucose thiourea prepolymer and sodium chloride. The modified thin-wall hierarchical porous carbon has the characteristics of large specific surface area and large pore volume, andcan bear more metal lithium. The thin wall endows the hierarchical porous carbon with pore deformation capability and high strength, so the capability of bearing puncture of lithium dendrites is improved. Gas is used to passivate the surface of metal lithium, thereby facilitating improving of the production efficiency and improving of the passivation effects and consistency. The dispersed sulfidehas strong affinity to polysulfide ions, is beneficial to adsorption of the polysulfide ions and inhibition of shuttling of the polysulfide ions, and is suitable for preparation of a high-performancesulfur electrode material.

Description

technical field [0001] The invention relates to lithium battery technology, in particular to a preparation method and application of modified thin-walled hierarchical porous carbon for lithium-sulfur batteries. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Graphite (C 6 ), sulfide: Fe 2 S 3 、TiS 2 , NbS 2 , oxide: WO 3 , V 2 o 5 , SnO 2 Wait. Taking graphite anode material as an example, the anode reaction during charging and discharging: [0003] C 6 +xLi + +xe==Li x C 6 [0004] When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte. Graphite as the negative electrode has a layered structure, and lithium ions reaching the negative electrode are intercalated between the graphite layers to form lithium intercalation compou...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/485H01M10/0525
CPCH01M4/362H01M4/485H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 李洲鹏李艳刘宾虹
Owner ZHEJIANG UNIV
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