Foamy copper oxide/copper lithium ion battery anode and preparation method thereof

A technology of ion battery and copper oxide, which is applied in battery electrodes, electrode carriers/collectors, circuits, etc., can solve the problems of electrode capacity and cycle performance decline, active material utilization rate decline, conductivity decline and other problems, and achieve good contact and bonding strength, low cost, enhanced conductivity

Inactive Publication Date: 2012-03-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor conductivity of the oxide, and its large volume change during the lithium-deintercalation process, it is prone to pulverization and peeling off from the copper substr...

Method used

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  • Foamy copper oxide/copper lithium ion battery anode and preparation method thereof
  • Foamy copper oxide/copper lithium ion battery anode and preparation method thereof
  • Foamy copper oxide/copper lithium ion battery anode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The foamed copper with a porosity of 70% is acid-treated with 1mol / L hydrochloric acid, then washed with water and then dried; the dried copper foam is compacted under a pressure of 8 MPa, and the compacted The final foamed copper is placed in a heat treatment furnace, heated to 400 ° C, thermal oxidation reaction is carried out in an air atmosphere, kept for 0.25 hours, and then cooled to room temperature. On the surface of copper foam, a 400 nm-thick CuO-based CuO-containing Cu 2 Layered copper oxides of O to give foamy CuO / Cu 2 O / Cu material.

[0036] The conductive agent carbon black, the binder PVDF (polyvinylidene fluoride), and the solvent NMP (N-methylpyrrolidone) were prepared into a slurry at a mass ratio of 1:1:100, and stirred evenly. The above prepared foam CuO / Cu 2 The O / Cu material was immersed in the slurry, and then it was taken out to drain the excess slurry, dried, and then pressed into a thin sheet with a pressure of 15 MPa, which can be used as t...

Embodiment 2

[0041] The copper foam with a porosity of 50% was acid-treated with 0.05 mol / L nitric acid, washed with water, and then dried; the dried copper foam was compacted under a pressure of 20 MPa, and the compacted The treated foamed copper is placed in a heat treatment furnace, heated to 250 °C, thermal oxidation reaction is carried out in the air atmosphere, and the heat preservation is kept for 4 hours, and Cu with a thickness of 200 nm is grown in situ on the surface of the foamed copper. 2 Layered foam Cu with O as the main content and trace amount of CuO 2 O / CuO oxide, resulting in foamed Cu 2 O / CuO / Cu material and then cooled to room temperature.

[0042] The conductive agent acetylene black, the binder PVDF (polyvinylidene fluoride), and the solvent NMP (N-methylpyrrolidone) were prepared into a slurry at a mass ratio of 1:0.5:10, and stirred evenly. Brush the slurry on the foamed Cu prepared above 2 The surface of the O / CuO / Cu material was dried, and then pressed into a ...

Embodiment 3

[0046] The copper foam with a porosity of 85% was acid-treated with 2 mol / L acetic acid, washed with water, and then dried; the dried copper foam was compacted under a pressure of 2 MPa, and the compacted The treated foamed copper is placed in a heat treatment furnace, heated to 200 °C, thermal oxidation reaction is carried out in the air atmosphere, and the heat preservation is kept for 20 hours, and layered Cu with a thickness of 600 nm is grown in situ on the surface of the foamed copper. 2 O, to get foamy Cu 2 O / Cu material and then cooled to room temperature.

[0047] A mixture of the conductive agent acetylene black and carbon black with a mass ratio of 7:3, the binder PVDF (polyvinylidene fluoride), and the solvent NMP (N-methylpyrrolidone) were formulated into a slurry at a ratio of 1:2:100. Stir well. The above prepared foam Cu 2 The O / Cu material was immersed in the slurry, then it was taken out to drain the excess slurry, dried, and then pressed into a thin sheet...

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Abstract

The invention discloses a foamy copper oxide/copper lithium ion battery anode and a preparation process thereof, and the process comprises the following steps: performing surface pickling treatment of foamy copper, cleaning with water, stoving, performing compacting treatment; performing surface oxidation treatment in a heat treatment furnace with air atmosphere to obtain a layer of copper oxides (CuO, Cu2O, or a mixture of the two) on the surface; mixing a carbon-based conductive agent, a binder, and a solvent to obtain slurry, coating the slurry on the surface of the foamy copper oxide/copper composite material, stoving and compacting. The copper oxide/copper material which is coated with the conductive agent and the binder and has a three dimensional structure can be directly used as an anode of a lithium ion battery, and no processes for preparing slurry by the active substance, the binder, and the conductive agent and coating the slurry on a current collector, which are required for traditionally preparing a lithium ion battery anode, are required. The coated conductive agent and binder can increase the electrical contact of the copper oxide active substance during the charge and discharge processes, and increase the electron conductivity and the utilization rate of the active substance. The lithium ion battery anode of the invention has high specific capacity, and good cycle performance; the preparation method of the electrode is simple and easily controlled, and is quite applicable to industrial application of lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific capacity, no memory effect, and environmental friendliness. Since their inception, they have been widely used in portable electronic devices such as mobile phones, notebook computers, and small cameras. With the increasing demand for energy in modern society, the limited reserves of traditional petrochemical energy and the increasing environmental requirements of human society, the high energy density and high power density of electric vehicles, electric bicycles, solar and wind energy reserves, electric tools, etc. And the demand for a green secondary power supply with good performance is increasingly urgent. Lithium-ion batteries have great potential to meet their requirements, and...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/80H01M4/48H01M4/62H01M4/131H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 高明霞丁继来黄静露潘洪革刘永锋徐钊君
Owner ZHEJIANG UNIV
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