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Silicon-carbon composite electrode material and preparation method thereof

An electrode material, carbon-silicon composite technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of loss of electrical contact performance of active centers, low electrochemical energy absorption of batteries, affecting chemical cycles, etc., to improve electrochemical performance. , good mechanical stability, the effect of reducing instability

Pending Publication Date: 2019-10-08
NORTHERN ALTAIR NANOTECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the lithium-ion battery in the prior art, due to the serious volume effect of the silicon electrode material in the deintercalation process, the active center loses its electrical contact performance, thereby affecting its chemical cycle, making its battery electrochemically energy-absorbing lower technical issues

Method used

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  • Silicon-carbon composite electrode material and preparation method thereof
  • Silicon-carbon composite electrode material and preparation method thereof
  • Silicon-carbon composite electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] This embodiment provides a Si / C composite material, which is prepared by the following method:

[0058] S1: Dissolving the pitch of the reaction precursor in an organic solution such as tetrahydrofuran or acetone to form a first mixed solution;

[0059] S2: After adding an appropriate amount of graphite with an average particle size of 1 micron into the first mixed solution, vibrate in an ultrasonic oscillator for 15 minutes, and form a second mixed solution after the graphite is uniformly dispersed;

[0060] S3: Add the silicon powder as the active center into the second mixed solution, and stir to form a uniform slurry, stir evenly at room temperature, and transfer it to the quartz tube 103 after volatilizing at room temperature, and pass through the quartz tube 103 at the same time Into a protective atmosphere, heat treatment at 900 ° C to prepare composite materials.

Embodiment 2

[0062] This embodiment also provides a Si-Al / C composite material, which is prepared by the following method:

[0063] S1: Mix silicon powder and fine aluminum powder with a particle size of 5 microns in a mass ratio of 5:1;

[0064] S2: After ball milling and mixing in the Ar ball milling atmosphere, in the mixed gas (4%H 2 , under the protection of 96% Ar), and after heat treatment at 600 degrees, it is prepared into a composite material precursor;

[0065] S3: Dissolve an appropriate amount of asphalt in acetone, stir evenly, slowly add graphite powder with a particle size of 1-2 microns, gently stir and grind properly;

[0066] S4: Add the heat-treated silicon / aluminum powder into the asphalt solution and stir evenly. At room temperature, after the solvent is volatilized, the mixture is transferred into a quartz tube 103, placed in a furnace body 107, and heat-treated at 900° C. to prepare a composite material.

[0067] The content of each component of the Si-Al / C compo...

Embodiment 3

[0069] This embodiment provides a Si / C composite material, which is prepared by the following method:

[0070] S1: dissolving 50 grams of reactant asphalt in isopropanol to form a first mixed solution;

[0071] S2: After fully stirring for 30 minutes, add 25 grams of graphite with a D50 of 1 micron into the first mixed solution, and vibrate in an ultrasonicator for 15 minutes to form a second mixed solution;

[0072] S3: After the graphite is uniformly dispersed, add 10 grams of silicon powder as the active center into it and stir thoroughly. Stir fully at room temperature, place in a fume hood, and after the solvent is volatilized, transfer to the quartz tube 103, and pass through protective gas (4%H 2 , 96% Ar) after heat treatment, and the temperature gradient of the heat treatment is to increase the temperature to 900 ° C, and gradually cool down after 3 hours of reaction to take it out.

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Abstract

The invention discloses a silicon-carbon composite electrode material and a preparation method thereof, and relates to the technical field of electrode material preparation. The preparation method ofthe carbon-silicon composite electrode material prepares the carbon-silicon composite electrode material by dispersing silicon in carbon by a high-temperature solid phase reaction, wherein the high-temperature solid-phase reaction is carried out by using silicon as an active center and using asphalt cracking carbon and graphite as a dispersion carrier carbon matrix. The method, by using the synergistic effect between the components of the composite material, achieves complementary advantages so as to prepare the carbon-silicon composite electrode material. Thus, the prepared composite materialnot only has relatively excellent mechanical stability, but also is exposed to an electrolyte relative to the silicon used as the active center, and has greatly reduced surface instability. Therefore, the cycle performance and the first charge-discharge efficiency of the composite material are far superior to those of a pure silicon material, thereby further improving the electrochemical performance of a battery.

Description

technical field [0001] The invention relates to the technical field of electrode material preparation, in particular to a carbon-silicon composite electrode material and a preparation method thereof. Background technique [0002] With the wide application and development of various portable electronic devices and electric vehicles, it is extremely urgent to develop new lithium-ion battery materials with high specific capacity. [0003] However, in the lithium-ion battery in the prior art, due to the serious volume effect of the silicon electrode material in the deintercalation process, the active center loses its electrical contact performance, thereby affecting its chemical cycle, making its battery electrochemically energy-absorbing Lower technical issues. [0004] In view of this, the present invention is proposed. Contents of the invention [0005] The purpose of the present invention includes providing a method for preparing a carbon-silicon composite electrode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/628H01M10/0525H01M2004/021Y02E60/10
Inventor 关玉明白岩赵晓磊游志江
Owner NORTHERN ALTAIR NANOTECH CO LTD
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