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A double-layer coated graphite composite material and its preparation method and application

A double-layer coating, composite material technology, applied in the field of materials, can solve the problems of low conductivity of iron oxide negative electrode material, low capacity of graphite negative electrode material, poor rate characteristics, etc., and achieve excellent electrical cycle stability, low price, and electrical conductivity. high rate effect

Active Publication Date: 2022-03-01
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of low capacity of graphite negative electrode materials, co-intercalation of solvents, low conductivity of iron oxide negative electrode materials, and poor rate characteristics, the invention discloses a new preparation method of graphite / oxide composite materials

Method used

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  • A double-layer coated graphite composite material and its preparation method and application
  • A double-layer coated graphite composite material and its preparation method and application
  • A double-layer coated graphite composite material and its preparation method and application

Examples

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Effect test

Embodiment 1

[0030] Step A: 2.5g Fe 3 o 4 , 20g alumina grinding balls (5mm in diameter) and 50ml ethanol were added in the middle of the 150ml ball milling tank, ball milled for 24 hours under the condition of 500 rpm, and the grinding balls were filtered to obtain Fe 3 o 4 ethanol dispersion.

[0031] Step B: Add another 50g of PAN to 1000ml of DMF, stir for 3 hours to fully dissolve the PAN, then add 15g of graphite powder to the solution and continue stirring for 1 hour. Then, the graphite is separated from the DMF solution of PAN by centrifugation to obtain a slurry graphite material (the DMF solution of PAN coated on the surface).

[0032] Step C: Under stirring conditions, the slurry-like graphite material separated in step B is uniformly dispersed into the Fe prepared in step A 3 o 4 In the ethanol dispersion; the above dispersion was stirred for 2 hours and then fully dried at 60°C to obtain graphite@PAN@Fe 3 o 4 Material.

[0033] Step D: The graphite obtained in step C@P...

Embodiment 2

[0043] Step A: Add 8g Fe 3 o 4 , 40g of alumina balls (diameter 5mm) and 50ml of ethanol were added into a 150ml ball mill jar, ball milled for 5 hours at 1000 rpm, and the balls were filtered to obtain Fe 3 o 4 ethanol dispersion.

[0044] Step B: Add another 100g of PAN to 1000ml of DMF, stir for 3 hours to fully dissolve the PAN, then add 24g of graphite powder to the solution and continue stirring for 1 hour. Then, the graphite is separated from the DMF solution of PAN by centrifugation to obtain a slurry graphite material (the DMF solution of PAN coated on the surface).

[0045] Step C: Under stirring conditions, the slurry-like graphite material separated in step B is uniformly dispersed into the Fe prepared in step A 3 o 4 In the ethanol dispersion; the above dispersion was stirred for 2 hours and then fully dried at 60°C to obtain graphite@PAN@Fe 3 o 4 Material.

[0046] Step D: The graphite obtained in step C@PAN@Fe 3 o 4 In an argon atmosphere, the temperat...

Embodiment 3

[0049] Step A: Add 1g Fe 3 o 4 , 20g alumina grinding balls (5mm in diameter) and 50ml ethanol were added in the middle of the 100ml ball milling tank, ball milled for 3 hours under the condition of 800 rev / min, and the grinding balls were filtered to obtain Fe 3 o 4 ethanol dispersion.

[0050] Step B: Add another 25g of PAN to 1000ml of DMF, stir for 3 hours to fully dissolve the PAN, then add 10g of graphite to the solution and continue stirring for 1 hour. Then, the graphite is separated from the DMF solution of PAN by centrifugation to obtain a slurry graphite material (the DMF solution of PAN coated on the surface).

[0051] Step C: Under stirring conditions, the slurry-like graphite material separated in step B is uniformly dispersed into the Fe prepared in step A 3 o 4 In the ethanol dispersion; the above dispersion was stirred for 2 hours and then fully dried at 60°C to obtain graphite@PAN@Fe 3 o 4 Material.

[0052] Step D: The graphite obtained in step C@PAN...

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Abstract

The invention discloses a double-layer coated graphite composite material, a preparation method and application thereof. The method comprises the following steps: A. preparing FeO x FeO with a solids content of 2.5‑20% by weight x / Ethanol dispersion, B. Preparation of polyvinyl nitrile (PAN) coated graphite material, C. Preparation of graphite@PAN@FeO x Materials, D. Graphite@C@FeO x Double cladding composite. The graphite@C@FeO x The application of the material is used as the negative electrode material in the lithium-ion battery. The graphite@C@FeOx double-layer coating material prepared by the present invention eliminates the problem that the solvent molecules of the lithium-ion battery will intercalate with the lithium ions between the graphite layers when the battery is charged, causing changes in the graphite structure and a large amount of capacity attenuation. Therefore, the graphite@C@FeOx double-layer coating material prepared by the present invention has better electrical cycle stability without reducing the specific capacity, and the graphite@C@FeOx double-layer coating structure has good chemical stability and sufficient Excellent electrical cycle stability, high electrical conductivity, sufficient supply of raw materials, low price, green and pollution-free.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a preparation method of carbon and iron oxide double-layer coated graphite composite material and its application in batteries. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, long full charge life, less environmental pollution, fast charging speed and low self-discharge rate, etc. Application prospect. From the perspective of the material composition of the battery, the negative electrode material is one of the important components of the lithium-ion battery. In the development of lithium-ion batteries, Li + The successful development of graphite-based anode materials with embedded reaction mechanisms is the key to large-scale application of lithium-ion batteries, and it is also the most widely used anode material product for lithium-ion batteries. Even in some other types of battery products, a certain amount of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/587H01M4/62H01M10/0525
CPCY02E60/10
Inventor 姜付义康利涛杜伟周艳丽孙学勤张潇予孙建超闫鑫升
Owner YANTAI UNIV