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Preparation method and application of embedded silicon carbon composite material

A silicon-carbon composite material and embedded technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of not being able to meet the needs, the effect is not very significant, and the effect is not very ideal, so as to improve cycle performance and inhibit volume expansion , making simple effects

Active Publication Date: 2018-02-27
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon compounding can introduce a buffer medium to slow down the volume effect of silicon to a certain extent and improve the cycle performance of silicon negative electrodes, but the effect is still not very satisfactory and cannot meet the demand
Other researchers started from the electrode structure and binder, and improved the cycle performance of silicon negative electrodes by changing the electrode structure and binder, but the results were not very significant.

Method used

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  • Preparation method and application of embedded silicon carbon composite material
  • Preparation method and application of embedded silicon carbon composite material
  • Preparation method and application of embedded silicon carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of resin solution

[0029] First weigh a certain amount of resin, add a certain amount of absolute ethanol, resin: absolute ethanol = 1:2, stir and dissolve; weigh a certain amount of curing agent, resin: curing agent = 10:3, stir and dissolve; weigh Take a certain amount of nano-silicon, resin: nano-silicon = 10:1, and stir evenly.

[0030] (2) Asphalt melting

[0031] Weigh a certain amount of asphalt, asphalt:resin=1:2, heat and melt; measure a certain amount of tetrahydrofuran, asphalt:tetrahydrofuran=10:3; heat the asphalt to 90°C, start stirring after the asphalt T softens, and control the speed at 300r / min.

[0032] (3) Preparation of silicon-carbon composite materials

[0033] Mix and stir the materials in steps (1) and (2) evenly, and quickly transfer to a closed reactor; heat the reactor to 90°C, observe the pressure and temperature of the reactor, and when the pressure and temperature rise, open the gas outlet of the reactor, Release the ...

Embodiment 2

[0038] (1) Preparation of resin solution

[0039] First weigh a certain amount of resin, add a certain amount of absolute ethanol, resin: absolute ethanol = 1:2, stir and dissolve; weigh a certain amount of curing agent, resin: curing agent = 10:3, stir and dissolve; weigh Take a certain amount of nano-silicon, resin: nano-silicon = 10:2, and stir evenly.

[0040] (2) Asphalt melting

[0041] Weigh a certain amount of asphalt, asphalt: resin = 1:2, heat and melt; measure a certain amount of tetrahydrofuran, asphalt: tetrahydrofuran = 10:3; heat the asphalt to 90°C, and start stirring after the asphalt softens, and control the speed at 300r / min.

[0042] (3) Preparation of silicon-carbon composite materials

[0043] Mix and stir the materials in steps (1) and (2) evenly, and quickly transfer them to a closed reactor; heat the reactor to 90°C, observe the pressure and temperature of the reactor, and when the pressure and temperature rise, open the gas outlet of the reactor, ...

Embodiment 3

[0048](1) Preparation of resin solution

[0049] First weigh a certain amount of resin, add a certain amount of absolute ethanol, resin: absolute ethanol = 1:2, stir and dissolve; weigh a certain amount of curing agent, resin: curing agent = 10:3, stir and dissolve; weigh Take a certain amount of nano-silicon, resin: nano-silicon = 10:3, and stir evenly.

[0050] (2) Asphalt melting

[0051] Weigh a certain amount of asphalt, asphalt:resin=2:1, heat and melt; measure a certain amount of tetrahydrofuran, asphalt:tetrahydrofuran=10:3; heat the asphalt to 90°C, start stirring after the asphalt softens, and control the speed at 300r / min.

[0052] (3) Preparation of silicon-carbon composite materials

[0053] Mix and stir the materials in steps (1) and (2) evenly, and quickly transfer them to a closed reactor; heat the reactor to 90°C, observe the pressure and temperature of the reactor, and when the pressure and temperature rise, open the gas outlet of the reactor, Relieve th...

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Abstract

The invention relates to the field of lithium ion batteries and particularly discloses a preparation method and application of an embedded silicon carbon composite material. The preparation method ofthe embedded silicon carbon composite material is characterized by comprising the following steps: stirring and dissolving resin in anhydrous ethanol, adding a curing agent, uniformly stirring, finally adding silicon powder and uniformly stirring; placing asphalt in a beaker, adding a solvent, heating, and stirring till the asphalt is completely molten; mixing the above material, quickly transferring into a sealed reaction vessel, heating while stirring and detecting relieved pressure till no volatile component is volatilized, and the material is cured; sintering and carbonizing the cured material in an inert atmosphere to obtain a final product. The embedded silicon carbon composite material is good in product performance, simple to make, environmentally-friendly and free from pollution,the cycling performance of silicon is improved, the volume expansion of the silicon is inhibited, and the multiple compounding of silicon carbon is realized.

Description

(1) Technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method and application of an embedded silicon-carbon composite material. (2) Background technology [0002] Since the commercialization of lithium-ion batteries in 1992, the application range of lithium batteries has gradually expanded. From portable electronic products to military equipment, and then to the utilization of new energy, lithium batteries are everywhere. Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high open circuit voltage, high energy density, long service life, no memory effect, no pollution, and small self-discharge, and are more and more widely used. Due to the rapid development and wide application of portable electronic devices and electric vehicles, there is an urgent need for lithium-ion batteries with high specific energy, long cycle life, and fast charge and discharge. [0003] With the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587
CPCH01M4/364H01M4/386H01M4/587Y02E60/10
Inventor 田崇社唐其伟赵成龙于恒杰田海燕张朋
Owner SHANDONG YUHUANG NEW ENERGY TECH
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