A kind of preparation method of silver-doped carbon-silicon composite negative electrode material

A technology of silicon composite materials and negative electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as fast and large current charging and discharging, and achieve high capacity, high conductivity, and fast charging and discharging rates.

Inactive Publication Date: 2015-10-28
云南云天化深泓新能源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its conductivity still needs to be further improved, otherwise it cannot meet the needs of fast and large current charging and discharging.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Silicon powder and nano-aluminum powder are ball-milled and mixed at a speed of 500 r / min for 10 h, the particle size of the nano-aluminum powder is 30-50 nm, the particle size of the silicon powder is 2-5 μm, and the mass ratio of the two is 1: 3. Immerse the product after ball milling in hydrochloric acid with a concentration of 2.5 mol / L, add 30% more hydrochloric acid than the amount that completely reacts aluminum, stir in the reaction kettle for 2 hours, filter and wash with deionized water until the pH is greater than It is equal to 5, and dried at 100 ℃ to make a porous silicon material.

[0018] Dissolve glucose for coating in deionized water, add the above-mentioned porous silicon material and spherical graphite with a particle size of 10-15 μm, seal it in a bearing-type ball mill jar under the protection of an inert gas, and mill at a speed of 400 r / min for 15 h , to obtain a mixed slurry, wherein the mass ratio of the porous silicon material, spherical graph...

Embodiment 2

[0025] Silicon powder and nano-aluminum powder were ball-milled and mixed at 600 r / min for 8 h, the particle size of the nano-aluminum powder was 30-50 nm, the particle size of the silicon powder was 2-5 μm, and the mass ratio of the two was 1: 5. Immerse the ball-milled product in hydrochloric acid with a concentration of 3 mol / L, add 40% more hydrochloric acid than the amount that completely reacts the aluminum, stir in the reaction kettle for 3 hours, filter and wash with deionized water until the pH is greater than It is equal to 5 and dried at 120°C to produce a porous silicon material.

[0026] Dissolve glucose for coating in deionized water, add the above-mentioned porous silicon material and spherical graphite with a particle size of 10-15 μm, seal it in a bearing-type ball mill jar under the protection of an inert gas, and mill at a speed of 500 r / min for 12 h , to obtain a mixed slurry, wherein the mass ratio of the porous silicon material, spherical graphite and glu...

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Abstract

The invention relates to a preparation method of a silver doped carbon-silicon composite negative electrode material. The preparation method comprises the following steps of: (1) preparing a carbon-silicon composite material; and (2) adding the carbon-silicon composite material into glycol solution, performing ultrasonic treatment and suction filtration, washing, drying, crushing, performing ball milling, sieving for later use, weighing corresponding amounts of AgNO3 and polyvinylpyrrolidone, dissolving in ammonia water solution, stirring, preparing potassium borohydride solution, preparing distilled water and ammonia water into mother liquor, holding in a reaction kettle, putting the spare carbon-silicon composite material in the mother liquor, dropwise adding mixed solution of the AgNO3 and the polyvinylpyrrolidone and the potassium borohydride solution into the mother liquor while stirring, centrifuging a reaction product, taking out precipitate, diluting, performing suction filtration, washing and drying to obtain the silver doped carbon-silicon composite negative electrode material. Ag with more superior conduction performance is doped in a prepared lithium ion battery, so that the lithium ion battery has the characteristics of high capacity, high conductivity and high cyclical stability.

Description

Technical field [0001] The invention relates to a preparation method of a silver-doped carbon-silicon composite negative electrode material. Background technique [0002] Due to the advantages of high potential, large specific energy, long cycle life, stable discharge performance, good safety, wide operating temperature range and green environmental protection, lithium-ion batteries are widely used in portable electronic devices, power tools, space technology and defense industry and other fields. The widely used negative electrode material is graphitized carbon material, which has excellent performance in multiple charge and discharge cycles, but its lithium storage capacity is lower than the theoretical specific capacity of graphite of 372mAh / g, which is difficult to meet the needs of the new generation of large lithium batteries used in the power and energy storage fields. Capacity Lithium-ion battery needs. [0003] In the research and development process of new negati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 廖小玉宗智慧
Owner 云南云天化深泓新能源科技股份有限公司
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