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Anode of lithium ion battery, preparation method and battery using anode

A technology of lithium ion battery and negative electrode is applied in the field of negative electrode and its preparation method and battery field using the negative electrode, which can solve the problems of reduced capacity, hidden danger, stress deformation and the like of lithium ion battery, achieve excellent cycle stability and improve electrical conductivity , the effect of high conductivity

Inactive Publication Date: 2012-02-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high temperature used in the preparation, it is easy to cause stress deformation, the contact between CuO and the Cu matrix is ​​poor, and it is easy to fall off, resulting in a decrease in the capacity of the lithium-ion battery, and the CuO rod is easy to puncture the separator and cause a short circuit of the battery, causing a safety hazard.

Method used

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  • Anode of lithium ion battery, preparation method and battery using anode
  • Anode of lithium ion battery, preparation method and battery using anode
  • Anode of lithium ion battery, preparation method and battery using anode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of CuO thin film: select 20 μm thick Cu foil as the current collector Cu foil, pickle the surface of the Cu foil with 1.0 mol / L hydrochloric acid, and then clean it with deionized water; place the cleaned Cu foil in In a closed tube furnace, dry at room temperature for 1.5 h under the protection of argon. The temperature of the closed tube furnace was raised to 300 °C at a rate of 10 °C / min, and then oxygen was introduced at a flow rate of 40 mL / min. After reaching room temperature, a CuO thin film was obtained on the surface of the current collector Cu foil.

[0037] Morphology of CuO thin film: observe the morphology of the prepared CuO thin film by scanning electron microscope, the scanning electron microscope picture is shown in Figure 1a . It can be seen from the figure that the CuO particles have certain gaps, and there are small short rod-like structures in the direction perpendicular to the surface of the Cu foil.

[0038] Preparation of lithium-io...

Embodiment 2

[0043] Preparation of CuO thin film: select Cu foil with a thickness of 20 μm as the current collector Cu foil, pickle the surface of the Cu foil with 0.5 mol / L hydrochloric acid, and then clean it with deionized water; put the cleaned Cu foil in the air After natural drying, it was placed in a closed tube furnace. The temperature of the closed tube furnace was raised to 250 °C at a rate of 5 °C / min, and then oxygen was introduced at a flow rate of 50 mL / min. A CuO thin film was obtained on the surface of the fluid Cu foil.

[0044] Morphology of CuO thin film: observe the morphology of the prepared CuO thin film by scanning electron microscope, the scanning electron microscope picture is shown in Figure 1b . It can be seen from the figure that the particle size is small and uniform, the dispersion between the particles is good, and there is a linear structure in the direction perpendicular to the surface of the Cu foil.

[0045] The negative electrode and the lithium ion b...

Embodiment 3

[0048] Preparation of CuO thin film: select 30 μm thick Cu foil as the current collector Cu foil, pickle the surface of the Cu foil with 1.0 mol / L acetic acid, and then clean it with deionized water; place the cleaned Cu foil in In a closed tube furnace, dry at room temperature for 2 h under the protection of nitrogen; the temperature of the closed tube furnace was raised to 350 °C at a rate of 15 °C / min, and then oxygen was introduced at a flow rate of 100 mL / min. After room temperature, a CuO thin film was obtained on the surface of current collector Cu foil.

[0049] Morphology of CuO thin film: observe the morphology of the prepared CuO thin film by scanning electron microscope, the scanning electron microscope picture is shown in Figure 1c . It can be seen from the figure that the particle size is relatively uniform, the dispersion between them is very good, there are large gaps, and there is a thin rod-like structure in the direction perpendicular to the surface of the...

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Abstract

The invention relates to an anode of a lithium ion battery, a preparation method for the anode and the battery using the anode. A cupric oxide (CuO) thin film is grown in situ on the surface of a current collector Cu foil by a thermal oxidation method for heating in an oxidizing atmosphere, and the current collector Cu foil and the CuO thin film grown in situ on the surface of the current collector Cu foil can be directly used as the anode of the lithium ion battery. A fussy and complex coating process required by the conventional preparation of the anode of the lithium ion battery is not required. The anode has high electrode capacity and high cyclical stability, and solves the problem that the high capacity and high cyclical stability of a commercial lithium ion anode material cannot be achieved at the same time. The preparation method provided by the invention is simple and easy to control, low in environmental requirements, high in electrode specific capacity and cycle performance and applied to the industrial application of the lithium ion battery.

Description

Technical field [0001] The invention involves a lithium ion battery, especially the negative electrode of a lithium ion battery and its preparation method and the use of the negative electrode. Background technique [0002] Lithium -ion battery is a green energy developed in the 1990s. Compared with traditional lead -acid, nickel -cadmium, nickel -metalized secondary batteries, lithium -ion batteries areThe advantages of no memory effects are very popular. It has been one of the hot spots for secondary energy research and development of countries around the world in the past ten years. [0003] With the gradual improvement of the requirements of the new generation of lithium -ion batteries, traditional electrode materials can no longer meet the demand, and the research and development of various positive and negative pole materials have began.At present, the negative electrode material for commercial lithium ion batteries is mainly carbon materials, and the theoretical capacity o...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/66H01M10/0525H01M4/1391
CPCY02E60/122H01M4/0402H01M4/131H01M4/1391H01M10/0525H01M2004/027Y02E60/10
Inventor 潘洪革唐渊波高明霞刘永锋丁继来
Owner ZHEJIANG UNIV
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