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A kind of preparation method and application of titanium dioxide/carbon/ferrous disulfide composite material

A technology of ferrous disulfide and composite materials, which is applied in the field of lithium-ion batteries and lithium-ion battery electrode materials, can solve the problems of electrical performance to be improved, and achieve the effects of low cost, high specific capacitance and high repetition rate

Active Publication Date: 2022-04-12
多助科技(武汉)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrical performance of the composite material needs to be improved.

Method used

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  • A kind of preparation method and application of titanium dioxide/carbon/ferrous disulfide composite material
  • A kind of preparation method and application of titanium dioxide/carbon/ferrous disulfide composite material
  • A kind of preparation method and application of titanium dioxide/carbon/ferrous disulfide composite material

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Experimental program
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Effect test

Embodiment 1

[0042] This embodiment prepares TiO 2 / C / FeS 2 The steps for composite materials are as follows:

[0043] S1. Add 0.3g of P25 TiO 2 React with 60mL of 10mol / L sodium hydroxide solution at 150°C for 24h. After the reaction, centrifuge the reaction mixture and wash the solid with deionized water to neutrality, then add the solid to 100mL of 0.1mol / L hydrochloric acid solution for Ion exchange for 24h to get H 2 Ti 3 o 7 Suspension. H 2 Ti 3 o 7 The suspension was centrifuged and the centrifuged solid was washed with deionized water until neutral.

[0044] S2, in the deionized water of 50mL, add the Tris of 5mmol tris (Tris), then add a certain amount of 0.1mol / L hydrochloric acid solution, prepare the Tris-HCl buffer solution that pH is 8.5, will obtain in the step S1 h 2 Ti 3 o 7 The solid was added to the above-mentioned Tris-HCl buffer solution, stirred evenly, and then 0.2 g of dopamine hydrochloride was added, and then magnetic stirring was continued for 48 h. ...

Embodiment 2

[0068] The difference between this embodiment and embodiment 1 is: in step S4, FeCl 2 4H 2 The consumption of O is 99.4mg, and the consumption of thioacetamide is 56.7mg (namely FeCl 2 4H 2 The mass ratio of O and thioacetamide is 1:0.57); Other contents are identical.

Embodiment 3

[0070] The difference between this embodiment and embodiment 1 is: in step S4, FeCl 2 4H 2 The consumption of O is 99.4mg, and the consumption of thioacetamide is 93.4mg (being FeCl 2 4H 2 The mass ratio of O and thioacetamide is 1:0.94); Other contents are identical.

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Abstract

The invention provides a method for preparing a titanium dioxide / carbon / ferrous disulfide composite material. The composite material is prepared by a two-step hydrothermal method, and TiO is obtained by dissolving P25 gas-phase titanium dioxide, coating it with dopamine, and calcining it. 2 / C composites, and then adding sulfur source and iron source to crystallize at high temperature to obtain bulk crystalline FeS 2 Composite carbon rod and TiO 2 Titanium dioxide / carbon / iron disulfide composites with nanoparticle structure. When this material is used as a negative electrode material for lithium ion batteries, it exhibits excellent cycle performance at different current densities; the preparation method of the composite material has the advantages of low cost, high repetition rate, safety and environmental protection, and the like.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to the field of electrode materials for lithium ion batteries, and particularly relates to the preparation and application of titanium dioxide / carbon / ferrous disulfide composite materials. Background technique [0002] The anode material of commercial lithium-ion batteries is usually graphite because of its low cost and good stability. However, graphite still has certain defects. Its theoretical specific capacity is only 372mAh / g, and its lithium ion intercalation / intercalation potential is very low. Such a low theoretical specific capacity will inevitably become a bottleneck for the development of new lithium-ion batteries in the future. At the same time, the low lithium-ion intercalation / intercalation potential will easily form lithium dendrites on the negative electrode. Lithium dendrites gathered on the negative electrode to a certain amount may pierce the battery. separator...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/364H01M10/0525Y02E60/10
Inventor 刘启明李光辉杨希国
Owner 多助科技(武汉)有限公司
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