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Negative electrode material and preparation method and application thereof

A technology of negative electrode material and negative electrode plate, applied in battery electrodes, structural parts, graphite, etc., can solve the problems of low charge and discharge efficiency, poor rate performance, etc., achieve a wide range of types, mild reaction conditions, and reduce the irreversible capacity of the first cycle Effect

Pending Publication Date: 2022-08-05
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The graphite negative electrode material described in the above scheme has the problem of poor rate performance or low charge and discharge efficiency. Therefore, it is necessary to develop a graphite negative electrode material with good rate performance and high charge and discharge efficiency.

Method used

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  • Negative electrode material and preparation method and application thereof
  • Negative electrode material and preparation method and application thereof
  • Negative electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] This embodiment provides a negative electrode material, and the negative electrode material is prepared by the following method:

[0063] (1) FeCl 3 (0.48 g) and graphite (0.08 g) were mixed well under an argon atmosphere, the mixture was transferred to an ampoule and evacuated for 30 min. Then, the ampoules were sealed and heated to 400°C in air at a heating rate of 5°C / min for 24 h. After cooling, the powder was washed with ethanol to remove excess FeCl 3 , and dried at 60 °C to obtain FeCl 3 -GIC;

[0064] (2) Synthesize FeCl 3 -GICs were transferred into polypropylene containers and irradiated at 700W for 30s in a microwave oven to obtain Fe 2 O 3 -GIC, the Fe 2 O 3 -GIC was reduced at 1000 °C for 1 h under nitrogen atmosphere, and Fe-GIC was obtained after cooling;

[0065] (3) Transfer Fe-GIC to dilute hydrochloric acid (HCl / H 2 O=1:10) solution, the mixture was stirred and heated at 100 °C for 1 h. Then, it was sonicated for 10 min and filtered. The ab...

Embodiment 2

[0068] This embodiment provides a negative electrode material, and the negative electrode material is prepared by the following method:

[0069] (1) The Fe (NO 3 ) 3 (0.4 g) and graphite (0.08 g) were mixed well under an argon atmosphere, the mixture was transferred to an ampoule and evacuated for 35 min. Then, the ampoule was sealed and heated to 400°C at a heating rate of 5°C / min in the air for 24 h. After cooling, the powder was washed with ethanol to remove excess Fe(NO) 3 ) 3 , and dried at 60 °C to obtain Fe(NO 3 ) 3 -GIC;

[0070] (2) The synthesized Fe(NO 3 ) 3 -GICs were transferred into polypropylene containers and irradiated at 720W for 30s in a microwave oven to obtain Fe 2 O 3 -GIC, the Fe 2 O 3 -GIC was reduced at 1020 °C for 1 h under nitrogen atmosphere, and Fe-GIC was obtained after cooling;

[0071] (3) Transfer Fe-GIC to dilute hydrochloric acid (HCl / H 2 O=1:10) solution, the mixture was stirred and heated at 105°C for 1 h. Then, it was sonicat...

Embodiment 3

[0073] The only difference between this example and Example 1 is that the mass ratio of templating agent and graphite is 0.5:1, and other conditions and parameters are exactly the same as Example 1.

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Abstract

The invention provides a negative electrode material and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing a template material and graphite, and heating for reaction to obtain a template material-graphite intercalation compound; (2) transferring the template material-graphite intercalation compound obtained in the step (1) into a polypropylene container, carrying out microwave treatment to obtain a metal oxide-graphite intercalation compound, and reducing the metal oxide-graphite intercalation compound to obtain a metal-graphite intercalation compound; and (3) mixing the metal-graphite intercalation compound obtained in the step (2) with an acid solution, stirring and reacting to obtain the negative electrode material. A pore structure is introduced into the graphite material, so that the capacity of lithium ions is effectively increased, the irreversible capacity of the first cycle is reduced, the preparation process of the negative electrode material is simple, the reaction condition is relatively mild, and the preparation cost is low. And template materials are wide in variety range, low in cost and easy to obtain.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries (LIBs) have the advantages of high energy density, high power density, long cycle life, and low price, and are considered to be the best choice for next-generation large-scale energy storage systems or electric vehicles (EVs) to surpass non-renewable energy sources. At present, lithium-ion batteries have been widely used in portable electronic products, and their application scope is still expanding rapidly. In recent years, the huge demand for new energy vehicles has stimulated the rapid growth of the lithium-ion battery market. Since the inception of Li-ion batteries, many different cathode materials have successfully entered the market, including LiCoO 2 (LCO), LiFePO 4 (LFP), LiMn 2 O 4 (LMO), LiNiO 2 (LNO), LiNi 1-y-z CoyMn z ...

Claims

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Application Information

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IPC IPC(8): C01B32/21C01B32/22H01M4/133H01M4/587H01M10/0525
CPCC01B32/21C01B32/22H01M10/0525H01M4/587H01M4/133H01M2004/027H01M2004/021Y02E60/10
Inventor 刘静
Owner SVOLT ENERGY TECHNOLOGY CO LTD