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Silicon/silicon oxycarbide/carbon anode material and preparation method and application thereof

A carbon anode material, silicon oxycarbide technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of phase separation, poor bonding, stable electrode structure, and inability to effectively absorb stress together. To achieve the effect of easy control of conditions, simple process, and reduction of adverse consequences

Active Publication Date: 2016-05-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation methods have weaknesses such as phase separation and poor bonding between the ceramic matrix and the carbon matrix, which cannot effectively absorb stress together, stabilize the electrode structure, and compensate for the conductivity of ceramics.

Method used

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  • Silicon/silicon oxycarbide/carbon anode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step (1). Stir and mix 99.9g bisphenol A epoxy vinyl ester resin and 0.1g vinyltrimethoxysilane at room temperature to obtain 100g mixed solution;

[0028] Step (2). Add 0.1 g of silicon nanoparticles to the above 9.9 g of the reaction solution, and ultrasonically stir for 3 minutes to obtain a uniformly dispersed slurry;

[0029] Step (3) Stir 9.98g of the above-mentioned mixed solution containing silicon nanoparticles and 0.02g of benzoyl peroxide at room temperature for 1 minute, mix well and pour into a tetrafluoroethylene mold, heat-cure at 80°C to obtain silicon / Polysiloxane / carbon precursor composite solid material;

[0030] Step (4). Grinding the silicon / polysiloxane / carbon precursor composite solid material for 1 minute to obtain solid particles;

[0031] Step (5). Calcining the above-mentioned solid particles at 800° C. for 4 hours under an inert atmosphere of argon to obtain solid particles of silicon / silicon oxycarbide / carbon negative electrode material; ...

Embodiment 2

[0035] Step (1). Stir and mix 50g bisphenol A-diglycidyl ether methacrylate and 50g vinyl triethoxysilane at room temperature to obtain 100g mixed solution;

[0036] Step (2). Add 0.8 g of silicon nanoparticles to the above 9.2 g of the reaction solution, and ultrasonically stir for 30 minutes to obtain a uniformly dispersed slurry;

[0037] Step (3) Stir the above 9.8g mixed solution containing silicon nanoparticles and 0.2g di(2,4-dichlorobenzoyl) peroxide at room temperature for 3 minutes, mix well and inject into the tetrafluoroethylene mold, Thermally cured at 150°C to obtain a silicon / polysiloxane / carbon precursor composite solid material;

[0038] Step (4). Grinding the silicon / polysiloxane / carbon precursor composite solid material for 5 minutes to obtain solid particles;

[0039] Step (5). Calcining the above-mentioned solid particles at 800° C. for 10 hours under an inert nitrogen atmosphere to obtain solid particles of silicon / silicon oxycarbide / carbon negative elec...

Embodiment 3

[0042] Step (1). Stir and mix 99.5g tetraethylene glycol dimethacrylate and 0.5g vinyl tris(b-methoxyethoxy)silane at room temperature to obtain 100g mixed solution;

[0043] Step (2). Add 0.2 g of silicon nanoparticles to the above 9.8 g of the reaction solution, and ultrasonically stir for 5 minutes to obtain a uniformly dispersed slurry;

[0044]Step (3) Stir 9.95g of the above-mentioned mixed solution containing silicon nanoparticles and 0.05g of diacetyl peroxide at room temperature for 2 minutes, mix well and pour into a tetrafluoroethylene mold, heat cure at 85°C to obtain silicon / polyethylene Siloxane / carbon precursor composite solid materials;

[0045] Step (4). Grinding the silicon / polysiloxane / carbon precursor composite solid material for 2 minutes to obtain solid particles;

[0046] Step (5). Calcining the above-mentioned solid particles at 800° C. for 5 hours under an inert atmosphere of nitrogen to obtain solid particles of silicon / silicon oxycarbide / carbon nega...

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Abstract

The invention discloses a silicon / silicon oxycarbide / carbon anode material and a preparation method and an application thereof. In the silicon / silicon oxycarbide / carbon anode material, ultra-small silicon-oxygen-carbon nanoparticles are evenly dispersed into a carbon substrate to be used as a buffer substrate while silicon nanoparticles are evenly inlaid into the carbon / silicon-oxygen-carbon buffer substrate. The method comprises the following steps: with a thermosetting resin monomer as a solvent system instead of a traditional solvent, dispersing silicon nano powder into the solvent evenly; obtaining a solid block of a silicon / polysiloxane / carbon precursor composite material by solidifying vinylite and a silane coupling agent containing double bonds; and carrying out high-temperature calcination after crushing, and carrying out ball-milling to obtain the silicon / silicon oxycarbide / carbon anode material. According to the method, a traditional organic solvent is not used; solvent post-treatment is avoided; the silane coupling agent is directly polymerized with resin; and carbon and silicon-oxygen-carbon are formed in situ through calcination polymer pyrolysis. With ceramic (silicon-oxygen-carbon) and carbon as the buffer substrates, the stress caused by silicon volume expansion is absorbed; and bad consequences caused by silicon volume expansion are eliminated and reduced.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a silicon / silicon oxycarbide / carbon negative electrode material and a preparation method thereof, in particular to a method for preparing silicon / silicon oxycarbide / carbon negative electrode material powder by using non-traditional solvents to form carbon in situ Its preparation method, and the application of the silicon / silicon oxycarbide / carbon negative electrode material in lithium ion battery negative electrode materials. Background technique [0002] Silicon has the advantages of high mass-to-capacity, low charge-discharge platform, abundant resources, and good safety, and has become one of the most potential lithium-ion battery anode materials. However, the problems of volume expansion and poor conductivity of silicon itself determine its short life and poor cycle performance. Studies have shown that nanosizing it and combining it with carbon materials is an effect...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/364H01M10/0525Y02E60/10
Inventor 程亚军张毅王梅梅朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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