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Porous silicon electrode for lithium ion battery based on 3D printing technology and its preparation method

A lithium-ion battery, 3D printing technology, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of high manufacturing cost and complex manufacturing process, and achieve the effects of low cost, simple manufacturing process and excellent electrical conductivity

Active Publication Date: 2022-04-26
高能数造(西安)技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion battery porous silicon electrode based on 3D printing technology, which solves the problems of complicated preparation process and high production cost in the prior art

Method used

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  • Porous silicon electrode for lithium ion battery based on 3D printing technology and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0038] Step 1, weigh the following components with an electronic balance according to mass percentage, solvent I 10% (wherein the mass percentage of polyethylene in xylene is 2wt%), solvent II 30% (deionized water: ethylene glycol: glycerol = 96:2:2), pore-forming agent ammonium bicarbonate 6%, electrode active material elemental silicon 50%, conductivity enhancer 2-20nm carbon nanotube 2%, binder carboxymethyl cellulose 2%, total 100%;

[0039] Step 2. Dry-mill the ammonium bicarbonate of micron-scale and nano-scale in a ball mill tank with a ball-to-material ratio of 7:1 for 2 hours, mix evenly, and obtain particle A for use;

[0040] Step 3. Slowly add the particle A obtained in step 2 to the xylene solution of solvent I polyethylene, and place it on a magnetic stirrer for 25 minutes, then disperse it by ultrasonic oscillation for 5 minutes, then centrifuge it in a centrifuge for 5 minutes, and then dry it in a vacuum. oven at 50°C to a semi-dry state to obtain mixture B; ...

Embodiment 2

[0046] Step 1, weigh the following components with an electronic balance according to mass percentage, solvent I 15% (wherein the mass percentage of polyethylene in xylene is 5wt%), solvent II 25% (deionized water: ethylene glycol: glycerol = 96:2:2), pore-forming agent ammonium chloride 5%, elemental silicon 50% of electrode active material, conduction enhancer 2-20nm diameter carbon nanotube 3%, binder carboxymethyl cellulose 2%, total 100%;

[0047] Step 2. Dry-mill ammonium chloride in micron-scale and nano-scale in a ball mill tank with a ball-to-material ratio of 7:1 for 2 hours, mix evenly, and obtain particle A for use;

[0048] Step 3. Slowly add the particle A obtained in step 2 to the xylene solution of solvent I polyethylene, and place it on a magnetic stirrer for 15 minutes, then disperse it by ultrasonic oscillation for 10 minutes, then centrifuge it in a centrifuge for 5 minutes, and then dry it in a vacuum. oven at 50°C to a semi-dry state to obtain mixture B;...

Embodiment 3

[0054] Step 1, weigh the following components with an electronic balance according to mass percentage, solvent I 10% (wherein the mass percentage of polyethylene in xylene is 10wt%), solvent II 35% (deionized water: ethylene glycol: glycerol = 96:2:2), pore-forming agent ammonium chloride 6%, electrode active material elemental silicon 45%, conductivity enhancer 2-20nm carbon nanotubes, binder carboxymethyl cellulose 2%, total 100%;

[0055] Step 2. Dry-mill ammonium nitrate in a ball mill tank with a ball-to-material ratio of 7:1 for 2.5 hours, mix evenly, and obtain particle A for use;

[0056] Step 3. Slowly add the particle A obtained in step 2 to the xylene solution of solvent I polyethylene, and place it in a magnetic stirrer for 45 minutes, then disperse it by ultrasonic oscillation for 10 minutes, then centrifuge it in a centrifuge for 10 minutes, and then dry it in a vacuum. oven at 50°C to a semi-dry state to obtain mixture B;

[0057] Step 4. Add carbon nanotubes ...

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Abstract

The invention discloses a lithium-ion battery porous silicon electrode based on 3D printing technology, which consists of the following components according to the mass ratio: solvent I 10%-15%, solvent II 25%-35%, pore-forming agent 4%-8 %, 45% to 55% of electrode active materials, 2% to 4% of conductive enhancers, and 2% of binders, totaling 100%. The invention also discloses a method for preparing the above-mentioned porous silicon electrode of lithium ion battery based on 3D printing technology. The porous silicon electrode of the lithium ion battery prepared by the invention based on the 3D printing technology has suitable porosity, excellent cycle stability, excellent electrical conductivity, simple preparation process, and meets environmental protection requirements.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a porous silicon electrode of lithium ion batteries based on 3D printing technology, and also relates to a preparation method of the porous silicon electrode of lithium ion batteries based on 3D printing technology. Background technique [0002] At present, the world's environmental pollution is becoming more and more serious, and the problem of energy depletion is becoming more and more prominent. Traditional fossil energy can no longer meet the needs of social development. The development and utilization of renewable and clean energy has become an inevitable trend. Chemical power sources are playing an increasingly important role because of their advantages of being easy to store and convert energy. Among them, lithium-ion batteries are favored by people because of their excellent charge and discharge performance, excellent cycle performance, high specific energy, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M10/0525
CPCH01M4/134H01M4/1395H01M4/0402H01M10/0525Y02E60/10
Inventor 屈银虎左文婧梅超张学硕何炫袁建才
Owner 高能数造(西安)技术有限公司
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