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

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

Inactive Publication Date: 2014-07-30
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 substrate, thereby further reducing the conductivity of the material and reducing the utilization rate of the active material. Decrease, the capacity and cycle performance of the electrode will decrease

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 negative electrode of a foamed copper oxide / copper lithium ion battery and a preparation process thereof, comprising the following steps: carrying out pickling treatment on the surface of the foamed copper, washing and drying it with water, and compacting it; The surface is oxidized in an air atmosphere heat treatment furnace to obtain a layer of copper oxide (CuO, Cu2O or a mixture of the two) on the surface; then the slurry obtained by mixing carbon-based conductive agent, binder and solvent Coating on the surface of the foamed copper oxide / copper composite material, drying and pressing. The three-dimensional structure copper oxide / copper material coated with a conductive agent and a binder on the surface can be directly used as a negative electrode of a lithium-ion battery, without the need for mixing active materials with a binder and a conductive agent in the traditional preparation of a negative electrode of a lithium-ion battery The process of making a slurry and coating it on a current collector. The coated conductive agent and binder can increase the electrical contact of the copper oxide active material during charging and discharging, and increase the electronic conductivity and the utilization rate of the active material. The negative electrode of the lithium ion battery of the invention has high specific capacity, good cycle performance, and the preparation method of the electrode is simple and easy to control, and is very suitable for the industrial application of the lithium ion battery.

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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Patent Type & Authority Patents(China)
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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