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Preparation method of zinc oxide nanosheet for negative electrode of lithium-ion battery

A zinc oxide nanometer, lithium-ion battery technology, applied in nanotechnology for materials and surface science, battery electrodes, zinc oxide/zinc hydroxide, etc. The effect of improving initial discharge capacity and good electrochemical performance

Inactive Publication Date: 2016-07-20
SYNERGY INNOVATION INST OF GDUT HEYUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This zinc oxide nanosheet is used as the negative electrode material of lithium-ion batteries, which overcomes the problems of low initial discharge capacity, poor conductivity, and volume expansion effect of zinc oxide, and has the characteristics of strong cycle stability and good conductivity.

Method used

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  • Preparation method of zinc oxide nanosheet for negative electrode of lithium-ion battery
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  • Preparation method of zinc oxide nanosheet for negative electrode of lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Place 5 mmol of zinc acetate in 70 mL of deionized water and dissolve under magnetic stirring;

[0027] 2) When the zinc acetate is completely dissolved, add 10 mmol sodium citrate and 10 mmol sodium hydroxide, and stir for 1 hour;

[0028] 3) 5 mmol of hexamethylenetetramine is added to the solution in step 2, and stirred until dissolved;

[0029] 4) Transfer to a 100ml reaction kettle, heat to 120°C, and keep warm for 12 hours;

[0030] 5) After the reaction is finished, cool to room temperature, filter, and collect to obtain the zinc oxide nanosheet material;

[0031] 6) Put the prepared zinc oxide nanosheet material, conductive agent acetylene black, and binder polyvinylidene fluoride in a mortar in a mass ratio of 7:2:1, grind and mix evenly, and drop in nitrogen methyl Grind the pyrrolidone solvent into a slurry, scrape the slurry evenly on the copper foil, dry it at 60°C for 12 hours, and press it into a thin sheet with a tablet press under a pressure of 5 M...

Embodiment 2

[0036] 1) Place 6 mmol of zinc acetate in 70 mL of deionized water and dissolve under magnetic stirring;

[0037] 2) When the zinc acetate is completely dissolved, add 10.8mmol sodium citrate and 10.8mmol sodium hydroxide, and stir for 4 hours;

[0038] 3) Add 6 mmol of hexamethylenetetramine to the solution in step 2, and stir until dissolved;

[0039] 4) Transfer to a 100ml reaction kettle, heat to 150°C, and keep warm for 12 hours;

[0040] 5) After the reaction is finished, cool to room temperature, filter, and collect to obtain the zinc oxide nanosheet material;

[0041] 6) Put the prepared zinc oxide nanosheet material, conductive agent acetylene black, and binder polyvinylidene fluoride in a mortar in a mass ratio of 7:2:1, grind and mix evenly, and drop in nitrogen methyl Grind the pyrrolidone solvent into a slurry, scrape the slurry evenly on the copper foil, dry it at 60°C for 12 hours, and press it into a thin sheet with a tablet press under a pressure of 5 MPa to o...

Embodiment 3

[0044] 1) Place 7mmol of zinc acetate in 70mL of deionized water and dissolve under magnetic stirring;

[0045] 2) When the zinc acetate is completely dissolved, add 14.7mmol sodium citrate and 14.7mmol sodium hydroxide, and stir for 2 hours;

[0046] 3) Add 7 mmol of hexamethylenetetramine to the solution in step 2, and stir until dissolved;

[0047] 4) Transfer to a 100ml reaction kettle, heat to 160°C, and keep warm for 15 hours;

[0048] 5) After the reaction is finished, cool to room temperature, filter, and collect to obtain the zinc oxide nanosheet material;

[0049] 6) Put the prepared zinc oxide nanosheet material, conductive agent acetylene black, and binder polyvinylidene fluoride in a mortar in a mass ratio of 7:2:1, grind and mix evenly, and drop in nitrogen methyl Grind the pyrrolidone solvent into a slurry, scrape the slurry evenly on the copper foil, dry it at 60°C for 12 hours, and press it into a thin sheet with a tablet press under a pressure of 5 MPa to o...

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Abstract

The invention provides a preparation method of a zinc oxide nanosheet for a negative electrode of a lithium-ion battery. The method comprises the following steps: (1) dissolving zinc acetate into deionized water as a precursor at a room temperature; (2) sequentially adding sodium citrate and sodium hydroxide to the solution prepared in the step (1) for stirring for 1-12 hours; (3) adding hexamethylenetetramine to the solution obtained in the step (2) and stirring and dissolving the hexamethylenetetramine, wherein the molar ratio of the zinc acetate to the sodium citrate to the sodium hydroxide to the hexamethylenetetramine is 1 to (1.8-2.1) to (1.8-2.1) to 1; and (4) transferring the solution into a reaction kettle, heating the solution to 120-160 DEG C, carrying out heat preservation for 10-48 hours, cooling the solution to a room temperature after reaction is ended, and filtering and collecting the solution to obtain a target material. The preparation method is simple to operate and low in cost; the zinc oxide nanosheet can be obtained through a one-step hydrothermal synthesis method; the contact area of the obtained zinc oxide nanosheet and an electrolyte is large; and the lithium-ion battery has relatively good electrochemical properties.

Description

technical field [0001] The invention relates to a preparation method of a zinc oxide nanosheet lithium ion battery negative electrode material, which belongs to the field of nano material preparation and new energy devices. Background technique [0002] With the rapid development of communication technology and computer technology, various electronic products such as mobile phones and notebook computers are moving towards the goal of "light, thin, short and small". The demand for batteries is very urgent, and the demand of the high-tech market has promoted the development of secondary batteries. The new secondary battery technology is regarded as a dual-use technology with strategic significance in the 21st century. An important factor affecting the performance of lithium-ion batteries is the negative electrode material. At present, commercial lithium-ion batteries mostly use graphite as the negative electrode material, which has a low capacity (372mAhg -1 ), poor low temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/0525B82Y30/00B82Y40/00C01G9/02
CPCB82Y30/00B82Y40/00C01G9/02H01M4/48H01M10/0525Y02E60/10
Inventor 张永光殷福星王新谭台哲
Owner SYNERGY INNOVATION INST OF GDUT HEYUAN
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