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Graphene/lithium titanium phosphate composite material, preparation method thereof and lithium ion battery

A lithium ion battery, lithium titanium phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low capacity of lithium titanium phosphate negative electrode, limited energy storage application, etc., and achieve environmental friendliness, cost controllable, good The effect of electrochemical performance

Active Publication Date: 2020-07-31
NINGBO FENGCHENG NANOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Conventional carbon-coated lithium titanium phosphate anodes (such as two-dimensional graphene-coated lithium titanium phosphate) have low capacity, which limits their practical energy storage applications

Method used

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  • Graphene/lithium titanium phosphate composite material, preparation method thereof and lithium ion battery
  • Graphene/lithium titanium phosphate composite material, preparation method thereof and lithium ion battery
  • Graphene/lithium titanium phosphate composite material, preparation method thereof and lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0059] Step A: According to the volume ratio of 1,3,5-trimethylbenzene and hydrochloric acid solution of 1:20, add 1,3,5-trimethylbenzene into 2.0mol / L hydrochloric acid solution, and continuously stir at 25°C for 30 minutes. Then, the mixture of 1,3,5-trimethylbenzene and hydrochloric acid solution was sonicated for 30 minutes to form an emulsion, wherein the ultrasonic frequency was 40 kHz.

[0060] Step B: At room temperature, according to the volume ratio of distilled water, graphene oxide solution, and emulsion 1:1.5:3, add distilled water and 5.0 mg / mL graphene oxide solution to the above emulsion, and let stand Afterwards, the precipitate was collected by vacuum filtration.

[0061] Step C: The above precipitate is fully mixed with lithium titanium phosphate (the mass ratio of graphene oxide to lithium titanium phosphate is 1:20), and placed in a quartz boat, placed in a tube furnace, under N 2 Under protection, the temperature was raised to 350°C at a heating rate of ...

Embodiment 2

[0063] Step A: According to the volume ratio of toluene to hydrochloric acid solution 1:50, add toluene into 1.0 mol / L hydrochloric acid solution, and stir continuously at 25°C for 30 minutes. Then, the mixture of toluene and hydrochloric acid solution was ultrasonically treated for 40 minutes to form an emulsion, wherein the ultrasonic frequency was 40 kHz.

[0064] Step B: At room temperature, according to the volume ratio of distilled water, graphene oxide solution, and emulsion 1:1:2, add distilled water and 2.0mg / mL graphene oxide solution to the above emulsion, and let stand Afterwards, the precipitate was collected by vacuum filtration.

[0065] Step C: The above precipitate is fully mixed with lithium titanium phosphate (the mass ratio of graphene oxide to lithium titanium phosphate is 1:20), and placed in a quartz boat, placed in a tube furnace, under N 2 Under protection, the temperature was raised to 300°C at a heating rate of 15°C / min, the front section was sinter...

Embodiment 3

[0067] Step A: According to the volume ratio of p-xylene, n-hexadecane and hydrochloric acid solution 0.5:0.5:10, add p-xylene and n-hexadecane to 3.0mol / L hydrochloric acid solution, and continuously stir at 25°C for 30 minutes . Then, the mixture of p-xylene, n-hexadecane and hydrochloric acid solution was ultrasonically treated for 20 minutes to form an emulsion, wherein the ultrasonic frequency was 40 kHz.

[0068] Step B: At room temperature, according to the volume ratio of distilled water, graphene oxide solution, and emulsion 1:2:6, add distilled water and 8.0mg / mL graphene oxide solution to the above emulsion, and let stand Afterwards, the precipitate was collected by vacuum filtration.

[0069] Step C: The above precipitate is fully mixed with lithium titanium phosphate (the mass ratio of graphene oxide to lithium titanium phosphate is 1:20), and placed in a quartz boat, placed in a tube furnace, under N 2 Under protection, the temperature was raised to 500°C at a ...

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Abstract

The invention discloses a graphene / lithium titanium phosphate composite material. The composite material comprises lithium titanium phosphate, and grapheme coating the surface of the lithium titaniumphosphate; and the graphene contains a porous structure, and the pore diameter of the porous structure ranges from 1 micrometer to 10 micrometers. The invention further provides a preparation method of the graphene / lithium titanium phosphate composite material and a lithium ion battery. The invention provides an efficient and simple method for synthesizing a spongy graphene / lithium titanium phosphate composite material. The synthesized spongy graphene / lithium titanium phosphate composite material can be used as a negative electrode for an aqueous lithium ion battery. The synthesized negative electrode material covers various spongy graphene / lithium titanium phosphate. The aqueous battery has the advantages of absolute safety, no fire, no explosion, environmental friendliness, controllablecost and the like.

Description

technical field [0001] The application relates to a graphene / lithium titanium phosphate composite material, a preparation method thereof and a lithium ion battery, belonging to the field of energy storage. Background technique [0002] At present, lithium titanium phosphate negative electrode materials have been successively developed at home and abroad for use in aqueous lithium-ion secondary batteries. However, this material is sensitive to aqueous electrolytes and is prone to side reactions such as hydrogen evolution and oxygen evolution, resulting in short battery life. In response to the above problems, many research teams have adopted the carbon coating strategy of lithium titanium phosphate, which can improve the stability of lithium titanium phosphate negative electrode materials to a certain extent, but the dense coating layer of carbon film will inhibit the lithium ions in the electrolyte from interacting with the active electrode. The mutual transmission between t...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/36
CPCH01M4/366H01M4/5825H01M4/625H01M10/36H01M2004/021H01M2004/027Y02E60/10
Inventor 吴志连李忆非李书顶张旭锋王耀国
Owner NINGBO FENGCHENG NANOTECHNOLOGY CO LTD
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