Preparation method of silicon dioxide-coated carbon fiber material, product and application

A carbon fiber material, silicon dioxide technology, applied in the field of lithium ion batteries, can solve the problems of poor cycle stability, material crushing and falling off, specific capacity drop too fast, etc., to achieve the effect of improving electrical conductivity, low cost and easy to obtain

Inactive Publication Date: 2018-04-13
汪涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the serious volume expansion and contraction in the lithium ion deintercalation process will cause the material to shatter and fall off, the specific capacity will drop too fast, and the cycle stability will be poor.

Method used

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  • Preparation method of silicon dioxide-coated carbon fiber material, product and application
  • Preparation method of silicon dioxide-coated carbon fiber material, product and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of a silica-coated carbon fiber material:

[0036] (1) Evenly disperse 100g of kapok fiber in 300g of acetone, then add 120g of toluene diisocyanate, 1g of stannous octoate T-9 and 20g of aminopropyltriethoxysilane in sequence, and continue stirring for 2 hours at 50°C ;

[0037] (2) After the above-mentioned reaction solution is cooled to room temperature, wash, filter and separate 2 times with acetone in the above-mentioned step (1), and obtain the pretreated kapok fiber after the filtrate is dried;

[0038] (3) Mix ethyl orthosilicate with anhydrous ethanol solution, and heat to 10-60°C for use; prepare an ethyl orthosilicate solution with a concentration of 12mM;

[0039] (4) Submerge the pretreated kapok fibers in the tetraethyl orthosilicate solution, keep the liquid level higher than the upper surface of the kapok fibers, and let stand for deposition for 30min;

[0040] (5) After the kapok fibers after deposition are rinsed with ethanol sol...

Embodiment 2

[0043] A preparation method of a silica-coated carbon fiber material:

[0044](1) Evenly disperse 100g of loofah fiber in 100g of toluene, then add 40g of toluene diisocyanate and 10g of aminopropyltrimethoxysilane in sequence, and continue to stir and react at 40°C for 1h;

[0045] (2) After the above-mentioned reaction solution is cooled to room temperature, wash and filter the isolate 2 times with toluene in the above-mentioned step (1), and obtain the pretreated loofah fiber after the filter is dried;

[0046] (3) Mix ethyl orthosilicate with anhydrous ethanol solution, and heat to 10-60° C. for use; prepare an ethyl orthosilicate solution with a concentration of 10 mM;

[0047] (4) Immerse the pretreated loofah fiber in the tetraethyl orthosilicate solution, keep the liquid level higher than the upper surface of the loofah fiber, and let it stand for 30 minutes;

[0048] (5) After the deposited loofah fiber was rinsed with ethanol solution and deionized water for 4 times...

Embodiment 3

[0051] A preparation method of a silica-coated carbon fiber material:

[0052] (1) Evenly disperse 100g of bamboo fiber in 500g of N,N-dimethylformamide, then add 300g of toluene diisocyanate, 3g of dibutyltin dilaurate T-12 and 30g of N-aminoethyl-3-ammonia Propylmethyldimethoxysilane, continuously stirred and reacted for 3h at 60°C;

[0053] (2) After cooling the above reaction solution to room temperature, wash and filter the isolate 3 times with N,N-dimethylformamide in the above step (1), and obtain the pretreated bamboo fiber after the filter is dried;

[0054] (3) Mix ethyl orthosilicate with anhydrous ethanol solution, and heat it to 10-60°C for use; prepare an ethyl orthosilicate solution with a concentration of 15mM;

[0055] (4) immerse the pretreated bamboo fiber in the tetraethyl orthosilicate solution, keep the liquid level higher than the upper surface of the bamboo fiber, and let it stand for deposition for 30min;

[0056] (5) after the bamboo fiber after dep...

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Abstract

The invention relates to the field of lithium-ion batteries, in particular to a preparation method of a silicon dioxide-coated carbon fiber material, a product and an application. The preparation method comprises the steps of (1) dispersing natural cellulose into an organic solvent, sequentially adding diisocyanate, a metal catalyst for polyurethane synthesis and a siloxane monomer or a siloxane polymer and carrying out stirring reaction; (2) filtering, drying and then obtaining pretreated natural cellulose; and (3) adopting tetraethylortho silicate as a precursor and the natural cellulose asa template and a carbon source, depositing a silicon dioxide film on the surface of the natural cellulose through a sol-gel method and then burning to obtain the silicon dioxide-coated carbon fiber material. According to the preparation method, a carbon fiber material is adopted as a support and buffer material of silicon dioxide, so that the volume effect generated through lithium ion extractionand insertion when the silicon dioxide is applied to a negative electrode material of the lithium battery is significantly improved, and the cycling stability is improved while the condition that thelithium battery has relatively high specific capacity is ensured.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method, product and application of a silica-coated carbon fiber material. Background technique [0002] Lithium-ion batteries have been widely used in electronic devices because of their small size, high specific capacity, environmental protection, and multiple charge and discharge advantages. At present, the negative electrode material of commercialized lithium-ion batteries is mostly graphite, but the low theoretical specific capacity (372mAh / g) of graphite limits the further development of high-capacity lithium-ion batteries. Studies have found that the reversible lithium storage capacity of silicon-based, tin-based and other alloy materials is much greater than that of graphite, but due to the volume effect in the lithium ion deintercalation process of lithium batteries, these materials have poor cycle stability and cannot be commercialized. Therefore, how ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/48H01M4/38H01M10/0525
CPCH01M4/366H01M4/386H01M4/48H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 汪涛
Owner 汪涛
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