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In-situ carbon-coated Fe3O4 composite material, preparation method thereof and application thereof in lithium ion battery

A technology of lithium-ion batteries and composite materials, which is applied in the field of lithium-ion batteries, can solve the problems of inconspicuous material surface wrapping, increased irreversible capacity of materials, and decreased specific capacity of materials, and achieves simple and controllable preparation processes to realize industrial production. The effect of high specific capacitance

Active Publication Date: 2020-06-05
合盛科技(宁波)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating of the present invention is mainly used to solve Fe 3 o 4 The stability of the material structure, when the coating amount is too high, the bulk density of the composite material will drop sharply, the specific capacity of the material will decrease significantly, and the irreversible capacity of the material will also increase sharply, and the coating amount will be insufficient. The wrapping is not obvious, and the effect of wrapping cannot be achieved

Method used

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  • In-situ carbon-coated Fe3O4 composite material, preparation method thereof and application thereof in lithium ion battery
  • In-situ carbon-coated Fe3O4 composite material, preparation method thereof and application thereof in lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Configure 4g / L coal-based BFA aqueous solution and let it stand for 24h; configure 0.2mol / L ferric chloride aqueous solution;

[0027] (2) 50 mL of ferric chloride aqueous solution was added dropwise to 50 mL of BFA aqueous solution, and after stirring for 1 h, a gel was formed, and the precipitate was washed with water until the pH was 7, and dried to obtain BFA-Fe;

[0028] (3) Under nitrogen protection, BFA-Fe was heated to 550°C at a heating rate of 5°C / min, kept at 550°C for 5 hours, and then cooled to room temperature to obtain a core-shell structure with a particle size of 1.6 μm. The thickness of the coating layer is 0.8nm, and the in-situ carbon-carbon coating amount is 2wt% in-situ carbon-coated Fe 3 o 4 composite material.

Embodiment 2

[0030] (1) Configure 3.5g / L coal-based BFA aqueous solution and let it stand for 24 hours; configure 0.3mol / L Fe(NO) 3 9H 2 O aqueous solution;

[0031] (2) Fe(NO) 3 9H 2 O aqueous solution was added dropwise to 50 mL of BFA aqueous solution, and after stirring for 1 h, a gel was formed, and the precipitate was washed with water until the pH was 7, and dried to obtain BFA-Fe;

[0032] (3) Under nitrogen protection, BFA-Fe was heated to 550°C at a heating rate of 5°C / min, kept at 550°C for 5 hours, and then cooled to room temperature to obtain a core-shell structure with a particle size of 1.0 μm. The thickness of the coating layer is 0.7nm, and the in-situ carbon-carbon coating amount is 1.6wt% in-situ carbon-coated Fe3 o 4 composite material.

Embodiment 3

[0034] (1) Configure 3g / L coal-based BFA aqueous solution and let it stand for 24h; configure 0.3mol / L Fe(NO) 3 aqueous solution;

[0035] (2) Fe(NO) 3 The aqueous solution was added dropwise to 50 mL of BFA aqueous solution, and after stirring for 1 hour, a gel was formed, and the precipitate was washed with water until the pH was 6.9, and dried to obtain BFA-Fe;

[0036] (3) Under nitrogen protection, BFA-Fe was heated to 510°C at a heating rate of 4°C / min, kept at 510°C for 5 hours, and then cooled to room temperature to obtain a core-shell structure with a particle size of 1.5 μm. The thickness of the coating layer is 0.8nm, and the in-situ carbon coating amount is 2.1wt%.

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Abstract

The invention relates to an in-situ carbon-coated Fe3O4 composite material as well as a preparation method thereof and an application thereof in a lithium ion battery, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps of adding a trivalent Fe salt aqueous solution into a BFA aqueous solution to form a gel precipitate; drying the gel precipitate to obtain BFA-Fe; carrying out carbonization treatment on the obtained BFA-Fe, so that the in-situ carbon-coated Fe3O4 composite material is prepared, the surfaces of Fe3O4 particles are comprehensively coated with the in-situ carbon, the surface coating uniformity is good, the coating thickness of the surface carbon material is controllable, and the structure of the coated composite material is more stable.

Description

[0001] field of invention [0002] The invention relates to an in-situ carbon-coated Fe 3 o 4 The composite material, its preparation method and its application in lithium ion battery belong to the technical field of lithium ion battery. Background technique [0003] As a device that provides key equipment for power storage systems, lithium-ion batteries have been successfully used in portable electronic devices, electric vehicles, and implanted medical devices. However, in the field of lithium-ion battery anode materials, to some extent, the traditional graphite anode materials with low capacity (372mAh / g) limit the application of graphite-based materials. Metal oxides (such as oxides of Sn, Co, Fe, etc., metallic oxide, MeO) materials can provide a high reversible capacity of up to 1000mA / g, so various MeO have been widely studied as potential negative electrode materials. Although the capacity of MeO negative electrode material is higher than that of commercial carbon ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/62H01M10/0525
CPCH01M4/523H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 张志伟杨斌胡世勇李辉侯保辉
Owner 合盛科技(宁波)有限公司
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