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Expanded graphite negative electrode material loaded with cross-needle shaped tin oxide and preparation method thereof

A technology of expanded graphite and negative electrode materials, which is applied in the field of material preparation and expanded graphite negative electrode materials, can solve the problems of insufficient energy density and poor charge-discharge cycle performance, and achieve good charge-discharge cycle performance, high energy density, and prevent agglomeration Effect

Active Publication Date: 2019-06-25
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems of insufficient energy density and poor charge-discharge cycle performance of lithium battery negative electrode materials in the prior art. The present invention provides a novel lithium battery negative electrode material and a preparation method thereof. The negative electrode material has Special morphology, that is, the tin oxide supported on the surface of expanded graphite has a cross-needle structure

Method used

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  • Expanded graphite negative electrode material loaded with cross-needle shaped tin oxide and preparation method thereof
  • Expanded graphite negative electrode material loaded with cross-needle shaped tin oxide and preparation method thereof
  • Expanded graphite negative electrode material loaded with cross-needle shaped tin oxide and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] S1: Immerse the expanded graphite in water and stir for 10 minutes to obtain a 5g / L expanded graphite suspension;

[0035] S2: prepare 0.1mol / L tin-containing salt solution, then add structure-directing agent polyvinyl dimethyl ammonium chloride to the tin-containing salt solution, and dissolve; the added amount of the structure-directing agent is related to the mass of tin The ratio is 5:1;

[0036] S3: Slowly add 66.4 mL of the tin-containing salt solution containing the structure directing agent dropwise into 1 L of the expanded graphite suspension, and the dropwise addition is completed within 1 min;

[0037] S4: Heating the expanded graphite suspension treated in S3 to reflux for 0.5h, and cooling to room temperature;

[0038] S5: 62.7mg of sodium borohydride and 531.2mg of sodium hydroxide were dissolved in 10mL of water, then added dropwise to the suspension treated in S4, and stirred for 2 hours to obtain a composite material containing tin oxide and expanded g...

Embodiment 2

[0042] S1: Immerse the expanded graphite in water and stir for 30 minutes to obtain a 10g / L expanded graphite suspension;

[0043] S2: Prepare 0.3mol / L tin-containing salt solution, then add structure-directing agent polyvinyl dimethyl ammonium chloride to the tin-containing salt solution, and dissolve; the added amount of the structure-directing agent is related to the mass of tin The ratio is 10:1;

[0044] S3: Slowly add 22.1mL of the tin-containing salt solution containing the structure directing agent dropwise into 1L of the expanded graphite suspension, and the dropwise addition is completed within 1min;

[0045] S4: Heating the expanded graphite suspension treated in S3 to reflux for 1 h, and cooling to room temperature;

[0046] S5: 75.3 mg of sodium borohydride and 796.8 mg of sodium hydroxide were dissolved in 10 mL of water, and then added dropwise to the suspension treated in S4, and stirred for 3 hours to prepare a composite material containing tin oxide and expa...

Embodiment 3

[0050] S1: Immerse expanded graphite in water and stir for 1 hour to obtain a 15g / L expanded graphite suspension;

[0051] S2: Prepare 0.5mol / L tin-containing salt solution, then add structure-directing agent polyvinyl dimethyl ammonium chloride to the tin-containing salt solution, and dissolve; the added amount of the structure-directing agent is related to the quality of tin The ratio is 15:1;

[0052] S3: Slowly add 13.3mL of the tin-containing salt solution containing the structure directing agent dropwise into 1L of the expanded graphite suspension, and the dropwise addition is completed within 30s;

[0053] S4: Heating the expanded graphite suspension treated in S3 to reflux for 1.5h, and cooling to room temperature;

[0054] S5: 75.3mg of sodium borohydride and 1062.4mg of sodium hydroxide were dissolved in 10mL of water, then added dropwise to the suspension treated in S4, and stirred for 4 hours to prepare a composite material containing tin oxide and expanded graphi...

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Abstract

The invention discloses an expanded graphite negative electrode material loaded with cross needle-shaped tin oxide and a preparation method thereof. The preparation method mainly comprises the steps of (1) expanded graphite dispersion, (2) preparation of a tin salt and structure-directing agent mixed solution, (3) dripping of the tin salt and structure-directing agent mixed solution, (4) backflow,(5) sodium borohydride alkaline solution reduction, (6) filtration and washing, and (7) calcination at a medium temperature. The prepared tin oxide containing expanded graphite negative electrode material has a special morphology and structure, and has excellent electrochemical performance.

Description

technical field [0001] The invention relates to the field of lithium battery negative electrode materials, in particular to an expanded graphite negative electrode material loaded with cross needle-shaped tin oxide, and a preparation method of the material. Background technique [0002] With the frequent shortage of non-renewable energy sources such as coal, oil, and natural gas, the energy problem is a serious problem faced by mankind in the 21st century, and the development of new energy and renewable clean energy is of paramount importance. Compared with traditional secondary batteries, lithium-ion batteries have outstanding advantages such as high working voltage, large specific energy, stable discharge voltage, long cycle life, and no environmental pollution. They have been widely used in mobile phones, notebook computers, and portable measuring instruments. and other small and lightweight electronic devices. At the same time, it is also the preferred power source for ...

Claims

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Application Information

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IPC IPC(8): H01M4/48
CPCY02E60/10
Inventor 晏荦汤占磊仰韻霖
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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