Method for preparing lithium-ion battery negative electrode material with three-dimensional porous structure

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc., can solve the problems of rapid capacity decay of tin dioxide and improve cycle stability and rate performance , the effect of shortening the diffusion distance and alleviating the volume change

Active Publication Date: 2017-08-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When this material is used as the negative electrode of lithium-ion batteries, it solves the problem of rapid capacity decay of tin dioxide and improves the conductivity of the electrode at the same time.

Method used

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  • Method for preparing lithium-ion battery negative electrode material with three-dimensional porous structure
  • Method for preparing lithium-ion battery negative electrode material with three-dimensional porous structure
  • Method for preparing lithium-ion battery negative electrode material with three-dimensional porous structure

Examples

Experimental program
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Effect test

Embodiment 1

[0024] 8.87g of glucose and 3.93g of potassium stannate were sequentially added to a container containing 70mL of deionized water, and then the above mixed solution was stirred for 1 hour. The mass ratio of glucose and potassium stannate was 2.25:1. The obtained colorless solution was put into a hydrothermal reaction kettle, sealed, and the reaction kettle was placed in a drying oven at 180° C. to heat for 4 hours. After the reaction, the product was centrifuged, the supernatant was discarded, and the precipitate was thoroughly cleaned, and the obtained brown solid (tin dioxide / polysaccharide) was dried in a vacuum oven at 80°C for 12 hours;

[0025] Add 100 mg of tin dioxide / polysaccharide into a container containing 10 mL of a mixed solution of water and ethanol, and sonicate for 1 hour, wherein the volume ratio of water and ethanol is 1:1. Then add 17.5 mg of sodium carboxymethyl cellulose and 25 mg of polyvinyl alcohol to the above solution successively, and stir for 10 mi...

Embodiment 2

[0033]The glucose of 7.86g and the potassium stannate of 3.93g are added successively in the container that fills 80mL deionized water, then above-mentioned mixed solution is stirred 1.5 hours, and the mass ratio of glucose and potassium stannate is 2:1; Will obtain Put the colorless solution into a hydrothermal reaction kettle, seal it, and heat the reaction kettle in a drying oven at 170°C for 6 hours; centrifuge the product after the reaction is completed, pour off the supernatant, and clean the precipitate thoroughly , place the obtained tan solid (tin dioxide / polysaccharide) in a vacuum oven at 70°C and dry for 10 hours;

[0034] Add 200mg of tin dioxide / polysaccharide to a container containing 20mL of a mixed solution of water and ethanol, ultrasonicate for 1.5 hours, wherein the volume ratio of water and ethanol is 3:2; then add 20mg to the above solution in sequence Add sodium carboxymethyl cellulose and 28.6mg polyvinyl alcohol, stir for 20 minutes, the mass ratio of ...

Embodiment 3

[0037] The glucose of 11.79g and the potassium stannate of 3.93g are added successively in the container that fills 80mL deionized water, then above-mentioned mixed solution is stirred 0.5 hour, and the mass ratio of glucose and potassium stannate is 3:1; The obtained Put the colorless solution into a hydrothermal reaction kettle, seal it, and heat the reaction kettle in a drying oven at 160°C for 8 hours; centrifuge the product after the reaction is complete, pour off the supernatant, and clean the precipitate thoroughly , place the obtained tan solid (tin dioxide / polysaccharide) in a vacuum drying oven at 60°C for 8 hours;

[0038] Add 50 mg of tin dioxide / polysaccharide to a container containing 15 mL of a mixed solution of water and ethanol, and ultrasonicate for 1.5 hours, wherein the volume ratio of water and ethanol is 2:3; then add 15 mg to the above solution in sequence Add sodium carboxymethyl cellulose and 21.4 mg polyvinyl alcohol, stir for 20 minutes, the mass rat...

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Abstract

The invention discloses a method for preparing a lithium-ion battery negative electrode material with a three-dimensional porous structure. The method comprises the steps of firstly, preparing stannic oxide/glycan complex clusters by a hydrothermal method; then solving the clusters in mixed solution of water and ethanol and adding sodium carboxymethyl cellulose and polyvinyl alcohol successively into the solution, mixing the mixed solution uniformly, then adding low-concentration aqueous solution of graphene oxide into the solution, continuously stirring the solution at 50-70 DEG C for 12 hours, dripping the uniformly mixed solution into a silicone mould and freezing the solution from top to bottom by liquid nitrogen, demoulding the sample, and then placing the sample in a freezing drying box until the sample is thoroughly lyophilized; and finally calcining the obtained product at 350-550 DEG C for 2-4 hours. An amorphous carbon/stannic oxide/graphene nano-composite material prepared by the invention has a three-dimensional porous structure. Due to the excellent structural characteristics of the product, when used as a negative electrode material of a lithium-ion battery, the product shows very high capacity per gram, excellent rate capability and cycle stability.

Description

technical field [0001] The invention relates to a preparation technology of a three-dimensional porous structure material, and belongs to the technical field of preparation of nanocomposite materials. Background technique [0002] Lithium-ion batteries have become the main power source of portable devices such as mobile phones and laptops due to their high open circuit voltage, high energy density, and long cycle life. In recent years, with the rapid development of large-scale energy storage devices such as electric vehicles, higher requirements have been placed on the performance of lithium-ion batteries. As an important part of lithium-ion batteries, the negative electrode plays a key role in battery performance. At present, most commercial lithium-ion batteries use graphite as the negative electrode, but due to the limitation of its structure, its theoretical lithium storage capacity is only 372mAh / g, which is difficult to meet the requirements of large-scale energy stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/48H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 陈坚徐晖王文秀
Owner SOUTHEAST UNIV
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