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A kind of negative electrode material, its preparation method and application

A technology of negative electrode material and particulate matter, applied in the field of negative electrode material, can solve problems such as limiting battery capacity, and achieve the effect of high discharge specific capacity, wide application prospect and easy operation.

Active Publication Date: 2021-03-16
SUZHOU GRAPHENE NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The current negative electrode materials are mainly natural graphite and artificial graphite. The theoretical limit gram capacity of graphite is 372mAh / g. As a negative electrode material for lithium-ion batteries, the capacity of the battery is limited, and it cannot meet people's increasing demand for batteries. requirements, there is an urgent need for a higher capacity material to replace

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  • A kind of negative electrode material, its preparation method and application
  • A kind of negative electrode material, its preparation method and application
  • A kind of negative electrode material, its preparation method and application

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preparation example Construction

[0035] Another aspect of the embodiments of the present invention provides a method for preparing an anode material, which includes:

[0036] Provide an emulsion mainly composed of silicone oil and water;

[0037] The emulsion is reacted with a graphene precursor, and then the obtained reaction product is dried and sintered to obtain a negative electrode material.

[0038] In some preferred embodiments, the main chain structure of the silicone oil is mainly composed of siloxane, and the main chain or end groups of the silicone oil contain amino groups.

[0039] In some preferred embodiments, the molar ratio of silicon element to oxygen element in the silicone oil is 1:4˜2:1.

[0040] Further, the mass average molecular weight of the silicone oil is 100-20000.

[0041] Further, the silicone oil includes methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil, methyl trifluoropropy...

Embodiment 1

[0064] Emulsify methyl silicone oil (the molar ratio of silicon element to oxygen element is 1:4, and the content of nitrogen element contained in amino group is 0.01wt%), dodecyl dimethyl benzyl ammonium chloride and purified water to obtain emulsification liquid, wherein, the mass ratio of the methyl silicone oil to purified water is 1:30, and the mass ratio of the methyl silicone oil to dodecyldimethylbenzyl ammonium chloride is 3:1;

[0065] The precursor of graphene-sulfonated graphene (radial size is 0.05 μm, thickness is 0.5nm, the molar ratio of carbon element and sulfur element contained in sulfonic acid group is 5:1), is added to the aforementioned emulsion, the resulting The mass ratio of methyl silicone oil and sulfonated graphene is 2:1, so that the two react quickly, and the obtained reaction product is the precursor of the target material;

[0066] Evaporated to dryness at 80°C for 24h to remove the moisture in the precursor, and then sintered at 450°C for 96h i...

Embodiment 2

[0068] Emulsify methyl chlorophenyl silicone oil (the molar ratio of silicon to oxygen is 2:1, the content of nitrogen contained in amino group is 10wt%), hexadecyltrimethylammonium chloride and purified water to obtain emulsification Liquid, wherein, the mass ratio of methyl chlorophenyl silicone oil to purified water is 2:1, and the mass ratio of methyl chlorophenyl silicone oil to cetyltrimethylammonium chloride is 30:1;

[0069] The precursor of graphene-sulfonated graphene (the radial dimension is 100 μm, the thickness is 20nm, and the molar ratio of carbon element and sulfur element contained in the sulfonic acid group is 30:1) is added to the aforementioned emulsion, and the formazan The mass ratio of chlorophenyl silicone oil to sulfonated graphene is 1000:1, which makes the two react quickly, and the obtained reaction product is the precursor of the target material;

[0070] Evaporated to dryness at 250°C for 4h to remove the moisture in the precursor, and then sinter...

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Abstract

The invention discloses a negative electrode material, a preparation method thereof and application. The negative electrode material comprises micron-sized particles which are formed by bonding and stacking of multiple basic units. Each basic unit has a core-shell structure, the core contains a combination of at least one selected from silicon and silicon oxide and carbon, and the shell contains graphene or a combination of graphene and carbon. The preparation method comprises steps: emulsion mainly formed by silicone oil and water is provided; the emulsion reacts with a precursor of graphene,the acquired reaction product is then dried and sintered, and a negative electrode material is prepared. The negative electrode material preparation process is simple, the operation is easy, the costis low, large-scale production is facilitated, the discharge specific capacity is high, the cycling performance is good, the method is suitable for a high-capacity lithium ion battery negative electrode, and the application prospect is wide.

Description

technical field [0001] The invention relates to a negative electrode material, in particular to a negative electrode material with a composite structure of at least one of silicon and silicon oxide and carbon coated with graphene or a combination of graphene and carbon, and a preparation method thereof, belonging to the technical field of negative electrode materials . Background technique [0002] The current negative electrode materials are mainly natural graphite and artificial graphite. The theoretical limit gram capacity of graphite is 372mAh / g. As a negative electrode material for lithium-ion batteries, the capacity of the battery is limited, and it cannot meet people's increasing demand for batteries. Requirements, urgently need a higher capacity material to replace. Contents of the invention [0003] The main purpose of the present invention is to provide a negative electrode material and its preparation method to overcome the deficiencies in the prior art. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/587H01M4/62H01M10/0525
CPCY02E60/10
Inventor 蒋永华高俊强
Owner SUZHOU GRAPHENE NEW MATERIAL TECH