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A kind of preparation method with layered structure silicon carbon negative electrode material

A technology of negative electrode material and layered structure, applied in the field of preparation of silicon carbon negative electrode material with layered structure, can solve the problems of hindering the application of silicon negative electrode material of lithium ion battery, loss of electrical contact of electrode material, unstable material interface, etc. Effects of increased conductivity, reduced overall expansion rate, and low cost

Active Publication Date: 2022-05-17
赣州市瑞富特科技有限公司
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  • 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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  • A kind of preparation method with layered structure silicon carbon negative electrode material
  • A kind of preparation method with layered structure silicon carbon negative electrode material
  • A kind of preparation method with layered structure silicon carbon negative electrode material

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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 with a layered structure, which aims to solve the technical problem of uneven expansion of the silicon carbon negative electrode material of the current lithium ion battery, which leads to an unstable material interface. The general steps of the method are: selecting and mixing flake-shaped single-particle graphite and silicon particles to obtain a mixed powder; adding the mixed powder to the carbon source precursor solution, and performing physical stirring and ultrasonic dispersion to obtain a suspension of the mixed powder liquid; carry out suction filtration molding of the mixed powder suspension to obtain a layered stacked solid with a high degree of orientation; carbonize the layered stacked solid at high temperature to obtain a layered graphite / silicon solid uniformly coated by amorphous carbon; The layered graphite / silicon solid is pulverized to obtain a layered graphite / silicon composite; carbon nanotubes and hard carbon precursors are used as raw materials, and a layer of carbon nanotube conductive network is bound on the surface of the layered graphite / silicon composite, and finally a carbon nanotube conductive network is obtained. Silicon carbon anode material with 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 Patents(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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