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Multi-component silicon carbon material and preparation method thereof

A silicon carbon material and multi-component technology, applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of high cost, unindustrialization of process routes, cumbersome processes, etc., to solve the problems of expansion and circulation, Avoid circular diving and cushion the effect of volume changes

Active Publication Date: 2019-05-21
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The patent (application number: CN201611211693.4) ​​uses rice husks as raw materials to prepare silicon carbon materials. This method is only conducive to reducing product prices, but it is far from solving the problems of expansion and circulation. In addition, the silicon content of products in this method is fundamental. Uncontrollable, the process route cannot be industrialized
[0006] Patent (application number: CN201710662065.6) developed a porous silicon negative electrode material. Although this method is beneficial to solve the problem of expansion and circulation, the process is cumbersome and the cost is high

Method used

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  • Multi-component silicon carbon material and preparation method thereof
  • Multi-component silicon carbon material and preparation method thereof
  • Multi-component silicon carbon material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] A method for preparing a multi-component silicon-carbon material for lithium-ion batteries, the preparation steps of which are:

[0037] (I) Evenly disperse nano-silicon, graphene and phenolic resin in ethanol solvent. The mass ratio of the three solids is nano-silicon: graphene: phenolic resin = 5: 1: 12.5, and the mass of ethanol added is silicon: ethanol = 1 : 21, mechanical stirring until the slurry is uniform;

[0038] (II) Under the protection of nitrogen at 130°C, dry the above slurry in a boiling dryer to make powder, and then mold it into a cylinder at 20MPa, with a diameter of 160mm and a height of 120mm;

[0039] (Ⅲ) Heat-treat the block at 550°C under a nitrogen atmosphere, cool it naturally after constant temperature for 2 hours, take it out, crush it, and classify it to obtain a powder with a particle size of 12 μm;

[0040] (Ⅳ) Mix the above powder and asphalt (residual carbon rate 80%) uniformly with a VC mixer at a mass ratio of 88:12, with a mixing sp...

Embodiment 2

[0042] A method for preparing a multi-component silicon-carbon material for lithium-ion batteries, the preparation steps of which are:

[0043] (I) Evenly disperse nano-silicon, carbon nanotubes and asphalt in propanol solvent. The mass ratio of the three solids is nano-silicon: carbon nanotubes: asphalt = 5:0.2:12.5, and the mass of ethanol added is silicon: propanol =5:159, mechanical stirring until the slurry is uniform;

[0044](II) Under the protection of nitrogen at 280°C, dry the above slurry in a flash dryer to make powder, and then mold it into a cylinder at 140MPa, with a diameter of 160mm and a height of 120mm;

[0045] (Ⅲ) Heat-treat the block at 500°C in an argon atmosphere, cool it naturally after constant temperature for 2 hours, take it out, crush it, and classify it to obtain a powder with a particle size of 10 μm;

[0046] (Ⅳ) Mix the above powder and pitch (78% residual carbon rate) with VC according to the mass ratio of 90:10, the mixing speed is 80rpm, th...

Embodiment 3

[0048] A method for preparing a multi-component silicon-carbon material for negative electrodes of lithium-ion batteries, the preparation steps of which are:

[0049] (I) Evenly disperse nano-silicon, carbon black, artificial graphite conductive agent and phenolic resin in isopropanol. The mass ratio of the four solids is nano-silicon: carbon black: artificial graphite conductive agent: phenolic resin=5:0.2: 0.8:12.5, add ethanol mass as silicon:ethanol=5:74, mechanically stir until the slurry is uniform;

[0050] (II) Under the protection of nitrogen at 170°C, dry the above slurry in a spray dryer to make powder, and then isostatically press it under 140MPa to form a cylinder with a diameter of 160mm and a height of 200mm;

[0051] (Ⅲ) Heat-treat the block at 500°C under a nitrogen atmosphere, cool it naturally after constant temperature for 2 hours, take it out, crush it, and classify it to obtain a powder with a particle size of 11 μm;

[0052] (Ⅳ) Mix the above powder wit...

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Abstract

The invention provides a preparation method of a multi-component silicon carbon material for a lithium ion battery. The preparation method comprises the following steps: uniformly dispersing nanometersilicon, carbonaceous conductive agent and amorphous carbon precursor in solvent, and removing solvent, and powdering to obtain a core material; and manufacturing the silicon carbon material of a core-shell structure with a double-deck shell through two-step cladding treatment. The silicon carbon material prepared through the invention is used as the lithium ion battery negative material, the reversible capacity is 1300-1600mAh / g, the first effect is 80-85%, and the capacity retention ratio after circulating for 1300 cycles at the 1C / 1C system is greater than and equal to 80%.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode material and a preparation method thereof, in particular to a multi-component silicon-carbon material used as a lithium-ion battery negative electrode material and a preparation method thereof. Background technique [0002] Electric vehicles are one of the core application areas of lithium-ion batteries. The development of lithium-ion batteries for electric vehicles is the top priority of this industry. The Chinese government also gives support to the development of lithium-ion batteries with high energy density, high cycle performance, and high rate performance. Many subsidy policies have been proposed, and the goal of achieving 300Wh / KG lithium-ion batteries for electric vehicles in 2020 has been proposed. [0003] At present, the most widely used lithium-ion battery anode material is graphite anode material, which has the characteristics of low price, good cycle performance, and good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCY02E60/10
Inventor 石磊邵浩明王志勇李能肖志平皮涛黄越华
Owner HUNAN SHINZOOM TECH
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