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Carbon-assembled copper sulfide hollow nanocube honeycomb material and its preparation and application

A technology of hollow nano and honeycomb materials, applied in the field of lithium-ion batteries, to achieve the effect of strengthening structural strength, high electrochemical performance, and improving structural stability

Active Publication Date: 2021-10-08
HANGZHOU VOCATIONAL & TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned composite structure has a certain effect in improving the conductivity of copper sulfide, but it still needs a new breakthrough in improving the cycle stability.

Method used

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  • Carbon-assembled copper sulfide hollow nanocube honeycomb material and its preparation and application
  • Carbon-assembled copper sulfide hollow nanocube honeycomb material and its preparation and application
  • Carbon-assembled copper sulfide hollow nanocube honeycomb material and its preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0042] (1) First, dissolve 0.38g of copper sulfate pentahydrate and 0.15g of sodium citrate in 80mL of deionized water; then dissolve 1g of NaOH in 20mL of deionized water, add the NaOH solution to the aforementioned solution, and stir for 3 minutes; then add 0.26g of ascorbic acid Dissolve in 50mL deionized water, add ascorbic acid solution to the above solution, and stir at room temperature for 1h; the product is washed with water and ethanol several times after centrifugation to obtain Cu 2 O cube;

[0043] (2) Take the 0.04g Cu prepared by step (1) 2 O cube material, dispersed in 30mL deionized water; 0.03gNa 2 S·9H 2 O was dissolved in 20 mL deionized water, and the Na 2 S solution was added to the above solution, stirred for 30min, and the product was washed three times with deionized water after centrifugation, and then immediately dispersed in a mixed solution of 20mL deionized water and 20mL ethanol, stirred for 30min; 3.97g Na 2 S 2 o 3 ·5H 2 O was dissolved i...

Embodiment 2

[0052] (1) First, dissolve 0.38g of copper sulfate pentahydrate and 0.15g of sodium citrate in 80mL of deionized water; then dissolve 1g of NaOH in 20mL of deionized water, add the NaOH solution to the aforementioned solution, and stir for 3 minutes; then add 0.26g of ascorbic acid Dissolve in 50mL deionized water, add ascorbic acid solution to the above solution, and stir at room temperature for 1h; the product is washed with water and ethanol several times after centrifugation to obtain Cu 2 O cube;

[0053] (2) Take the 0.04g Cu prepared by step (1) 2 O cube material, dispersed in 30mL deionized water; 0.03gNa 2 S·9H 2 O was dissolved in 20 mL deionized water, and the Na 2 S solution was added to the above solution, stirred for 30min, the product was centrifuged and washed 3 times with deionized water, then immediately dispersed in a mixed solution of 20mL deionized water and 20mL ethanol, stirred for 30min; 2g Na 2 S 2 o 3 ·5H 2 O was dissolved in 16 mL deionized wa...

Embodiment 3

[0058] (1) First, dissolve 0.38g of copper sulfate pentahydrate and 0.15g of sodium citrate in 80mL of deionized water; then dissolve 2g of NaOH in 20mL of deionized water, add the NaOH solution to the aforementioned solution, and stir for 3 minutes; then add 0.26g of ascorbic acid Dissolve in 50mL deionized water, add ascorbic acid solution to the above solution, and stir at room temperature for 1h; the product is washed with water and ethanol several times after centrifugation to obtain Cu 2 O cube;

[0059] Subsequent process is identical with embodiment 1.

[0060] The structure of the product carbon-assembled copper sulfide hollow nanocube honeycomb material is similar to Example 1, the main difference is that the side length of the hollow nanocube becomes 200-300nm, and the wall thickness is about 70nm.

[0061] Adopt the same process as in Example 1 to make the negative electrode of lithium ion battery, assemble into lithium ion battery, with current density 0.1A g -1...

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Abstract

The invention discloses a carbon-assembled copper sulfide hollow nano-cube honeycomb material. The copper sulfide hollow nano-cube is assembled into a three-dimensional honeycomb structure through carbon, and the carbon is amorphous carbon formed by carbonization of polyvinylpyrrolidone. The invention also discloses a method for preparing the carbon-assembled copper sulfide hollow nano-cube honeycomb material, first synthesizing cuprous oxide cubes, then forming copper sulfide hollow nano-cubes by vulcanization and etching, and then obtaining by polyvinylpyrrolidone assembly and carbonization . The invention can improve the electrical conductivity and structural stability of copper sulfide, and further improve its electrochemical activity and cycle stability, so that it has higher charge and discharge capacity and better cycle performance. Carbon-assembled copper sulfide hollow nanocube honeycomb materials have important application value as anode materials for lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a carbon-assembled copper sulfide hollow nano-cube honeycomb material and its preparation and application. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect, and are widely used in portable electronic devices, new energy vehicles and other fields. At present, the negative electrode material of commercial lithium-ion batteries mainly uses graphite (theoretical capacity is 372mAh g -1 ), its actual capacity is very close to the theoretical capacity, it is difficult to further increase, and it cannot meet the high performance requirements of the market for power supplies. In addition, the safety performance of graphite is poor, and the rate performance is low. Therefore, the development of high specific volume and high safety Anode materials are an important direction for the developme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525C01G3/12B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01G3/12C01P2004/03C01P2006/40H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 杨秋合袁永锋
Owner HANGZHOU VOCATIONAL & TECHN COLLEGE
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