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Graphene-based metallic tin composite material of integrated conductive network, and lithium battery negative electrode

A composite material and conductive network technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as difficult to achieve high efficiency, green, cheap, strong acid waste liquid, cumbersome preparation process, etc., to avoid pulverization and Shedding, reduced transmission resistance, advanced concept effects

Active Publication Date: 2021-02-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional large-scale graphene preparation process is cumbersome, high cost, and produces strong acid waste liquid, making it difficult to achieve efficient, green, and cheap graphene-based electrode material production

Method used

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  • Graphene-based metallic tin composite material of integrated conductive network, and lithium battery negative electrode
  • Graphene-based metallic tin composite material of integrated conductive network, and lithium battery negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment one: tin chloride thiourea ligand solution

[0033] Thiourea (1.52g, 0.02mol) was dissolved in 4 times the mass of deionized water (6.08mL) to obtain a thiourea solution; anhydrous tin chloride (2.61g, 0.01mol) was dissolved in 10 times the mass of deionized water In ionized water (26.1 mL), a tin chloride solution was obtained; the tin chloride solution was slowly added to the thiourea solution, and stirred for 2 hours to obtain a tin-coordinated thiourea solution.

Embodiment 2

[0034] Embodiment two: stannous oxalate coordination glucose thiourea resin prepolymerization

[0035] Thiourea (1.52g, 0.02mol) was dissolved in deionized water (6.08mL) to obtain thiourea solution, and anhydrous stannous oxalate (2.07g, 0.01mol) was dissolved in deionized water (20.7mL) to obtain stannous oxalate solution, the stannous oxalate solution was slowly added to the thiourea solution, and stirred for 2 hours to obtain the stannous oxalate thiourea ligand solution.

[0036] Sodium chloride (11.69 g, 0.2 mol) was dissolved in 46.76 mL of deionized water to obtain a sodium chloride solution. Take 3.96 g (0.02 mol) of glucose monohydrate and dissolve it in 3.96 mL of deionized water to obtain a glucose solution. Add the above-mentioned stannous oxalate thiourea ligand solution into the glucose solution, the molar ratio of glucose to thiourea is 1:1, put it in a water bath at 85°C, add 10wt% hydrochloric acid dropwise and fully stir to make the pH value at 1. Fully st...

Embodiment 3

[0037] Example 3: Preparation of nano-tin modified graphene

[0038] Thiourea (1.52g, 0.02mol) was dissolved in deionized water (6.08mL) to obtain thiourea solution, and stannous chloride dihydrate (2.26g, 0.01mol) was dissolved in deionized water (22.6mL) to obtain chloride stannous chloride solution, slowly add the stannous chloride solution into the thiourea solution, and stir for 2 hours to obtain the stannous chloride thiourea ligand solution.

[0039] Sodium chloride (11.69 g, 0.2 mol) was dissolved in 46.76 mL of deionized water to obtain a sodium chloride solution. Take 3.96 g (0.02 mol) of glucose monohydrate and dissolve it in 3.96 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 stir to make the pH value at 1 . Fully stir, after 45 minutes of poly...

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Abstract

The invention relates to a lithium ion battery technology, and aims to provide a graphene-based metallic tin composite material with an integrated conductive network, and a lithium battery negative electrode. The preparation method comprises the following steps: adding a glucose solution into a tin coordination thiourea solution, dropwise adding hydrochloric acid, and fully stirring; after a polymerization reaction, cooling to obtain a mixed solution of a tin-coordinated glucose thiourea prepolymer and sodium chloride; carrying out flash freezing to obtain spherical particles, and carrying outfreeze vacuum drying to obtain a precursor; calcining in an N2 atmosphere to carry out complete polymerization and thermal insulation carbonization on the prepolymer; and cooling, cleaning, filteringand drying in vacuum to obtain the graphene-based metallic tin composite material. According to the method, nano metallic tin is implanted into graphene, so that pulverization and falling of the metallic tin are avoided; the transmission resistance caused by the fact that lithium cannot penetrate through the graphene layer is effectively reduced, and the flexibility and high strength of grapheneeffectively stabilize the electrode structure; and the production process of the advanced graphene-based electrode material is simple, efficient, green and cheap.

Description

technical field [0001] The invention relates to lithium-ion battery technology, in particular to a graphene-based metal-tin composite material with an integrated conductive network and a lithium battery negative electrode. 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 interc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/362H01M4/387H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 刘宾虹汪倩倩李洲鹏
Owner ZHEJIANG UNIV
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