Preparation method of silicon-carbon negative electrode material of layered structure

A negative electrode material and layered structure technology, which is applied in the field of preparation of silicon-carbon negative electrode materials with a layered structure, can solve problems that hinder the application of silicon negative electrode materials for lithium-ion batteries, electrode materials lose electrical contact, and material interface instability, etc., to achieve Increased electrical conductivity, reduced overall expansion rate, and low cost effects

Active Publication Date: 2021-09-21
赣州市瑞富特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing a silicon-carbon negative electrode material with a layered structure, which aims to solve the problem of uneven expansion of silicon-carbon negative electrode materials in lithium-ion batteries, which leads to uneven material interfaces. Stability, that is, the electrode structure collapses and the active material peels off, causing the electrode material to lose electrical contact, resulting in rapid capacity decay, and the technical problems of poor silicon conductivity. Material application

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  • Preparation method of silicon-carbon negative electrode material of layered structure
  • Preparation method of silicon-carbon negative electrode material of layered structure
  • Preparation method of silicon-carbon negative electrode material of layered structure

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Embodiment 1

[0036] This specific embodiment is to prepare a silicon-carbon negative electrode material with a layered structure, and the specific steps of its preparation process are:

[0037] Step 1, select graphite and silicon particles of flake single particles, the graphite particles of the flake single particles have a length of 5-8 μm, a width of 3-5 μm, and a thickness of 1-3 μm, and the silicon particles of the flake single particles The length is 3-5 μm, the width is 2-4 μm, the thickness is 0.5-2 μm, and the mass ratio of graphite particles to silicon particles is 20:1, so that they are mixed in a high-speed disperser for 2 hours to obtain graphite / silicon mixed powder;

[0038] Step 2. Add graphite / silicon mixed powder into a deionized aqueous solution with a mass percentage of carbon source precursor of 1%, and the carbon source precursor is a composition of polyethylene glycol ether and diethyl phthalate , by physically stirring and ultrasonically dispersing 5H to obtain a mi...

Embodiment 2

[0044] This specific embodiment is to prepare a silicon-carbon negative electrode material with a layered structure, and the specific steps of its preparation process are:

[0045] Step 1, select graphite and silicon particles of flake single particles, the graphite particles of the flake single particles have a length of 8-12 μm, a width of 5-8 μm, and a thickness of 1-3 μm, and the silicon particles of the flake single particles The length is 5-8 μm, the width is 3-5 μm, the thickness is 0.5-2 μm, and the mass ratio of graphite particles to silicon particles is 10:1, so that they are mixed in a high-speed disperser for 6 hours to obtain graphite / silicon mixed powder;

[0046] Step 2. Add the graphite / silicon mixed powder into a deionized aqueous solution with a carbon source precursor of 10% by mass. The carbon source precursor is pitch, and disperse the mixed powder by physical stirring and ultrasonic dispersion for 13H to obtain a mixed powder suspension liquid;

[0047] ...

Embodiment 3

[0052] This specific embodiment is to prepare a silicon-carbon negative electrode material with a layered structure, and the specific steps of its preparation process are:

[0053] Step 1, select graphite and silicon particles of flake-like single particles, the graphite particles of the flake-like single particles have a length of 12-15 μm, a width of 8-10 μm, and a thickness of 1-3 μm, and the silicon particles of the flake-like single particles The length is 8-10 μm, the width is 5-7 μm, and the thickness is 0.5-2 μm. The mass ratio of graphite particles to silicon particles is 5:2, and they are mixed in a high-speed disperser for 10 hours to obtain graphite / silicon mixed powder;

[0054] Step 2. Add the graphite / silicon mixed powder into a deionized aqueous solution with a carbon source precursor of 20% by mass. The carbon source precursor is a composition of methanol, acetone and ethyl acetate. Physical stirring and ultrasound Disperse for 20 hours to obtain a mixed powde...

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Abstract

The invention discloses a preparation method of a silicon-carbon negative electrode material of a layered structure, and aims to solve the technical problem of unstable material interface caused by non-uniform expansion of an existing silicon-carbon negative electrode material of a lithium ion battery. The method roughly comprises the following steps of: selecting flake single-particle graphite and silicon particles, and mixing them to obtain mixed powder; adding the mixed powder into a carbon source precursor solution, and carrying out physical stirring and ultrasonic dispersion to obtain a mixed powder suspension; carrying out suction filtration molding on the mixed powder suspension to obtain a layered stacked solid with a high orientation degree; performing high-temperature carbonization on the layered stacked solid to obtain a layered graphite/silicon solid uniformly coated with amorphous carbon; crushing the layered graphite/silicon solid to obtain a layered graphite/silicon compound; taking carbon nanotubes and a hard carbon precursor as raw materials, binding a layer of carbon nanotube conductive network on the surface of the layered graphite/silicon compound, and finally acquiring the silicon-carbon negative electrode material of the layered structure.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a method for preparing a silicon-carbon negative electrode material with a layered structure. Background technique [0002] Compared with ordinary batteries, lithium-ion batteries have been rapidly popularized in mobile phones, notebook computers, etc. because of their high energy density, long cycle life, and no memory effect. The demand for multi-function and long-term driving continues to increase, and the demand for lithium-ion battery capacity is also increasing. At present, the improvement of lithium-ion battery capacity mainly depends on the development and improvement of negative electrode materials. Therefore, for a long time, increasing the specific capacity of lithium-ion battery negative electrode materials, reducing the first irreversible capacity, and improving the rate characteristics have always been the research and development of lithium-ion batteries. the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/625H01M4/386H01M10/0525Y02E60/10
Inventor 韩峰孙玉治韩少峰郭峰彭渊敏
Owner 赣州市瑞富特科技有限公司
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