High-performance negative electrode directly serving as lithium ion battery and battery using the negative electrode

A lithium-ion battery, high-performance technology, applied in the direction of electrode manufacturing, battery electrodes, negative electrodes, etc., can solve the problems of lithium-ion battery capacity reduction, safety hazards, battery short circuit, etc., achieve excellent cycle stability, improve conductivity, The effect of high conductivity

Inactive Publication Date: 2017-05-10
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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  • High-performance negative electrode directly serving as lithium ion battery and battery using the negative electrode
  • High-performance negative electrode directly serving as lithium ion battery and battery using the negative electrode
  • High-performance negative electrode directly serving as lithium ion battery and battery using the negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0040]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 room temperature, a CuO thin film was obtained on the surface of current collector Cu foil.

[0041] 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.

[0042] Preparation of lithium-ion battery nega...

Embodiment 2

[0047] 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.

[0048] 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.

[0049] The negative electrode and the lithium ion b...

Embodiment 3

[0052] 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, kept for 0.5 h, and then lowered to room temperature Finally, a CuO thin film was obtained on the surface of the current collector Cu foil.

[0053] 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 dir...

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Abstract

The invention relates to a high-performance negative electrode directly serving as a lithium ion battery and a battery using the negative electrode. A CuO film is grown on the surface of a current collector Cu foil in situ through a thermal oxidation method of heating in an oxidizing atmosphere, the current collector Cu foil and the CuO film grown on the surface of the current collector Cu foil in situ are directly used as the negative electrode of the lithium ion battery, and the traditional troublesome and complex coating process necessary for preparing the negative electrode of the lithium ion battery is not adopted. The high-performance negative electrode provided by the invention is simple and easy to control the preparation method, the requirements for the environment are low, the specific capacity of the electrode is high, the cycle performance is excellent, and the high-performance negative electrode is very suitable for the industrialized application of lithium ion batteries.

Description

[0001] The patent application for this invention is accepted by the State Intellectual Property Office of the People's Republic of China. Application number: 201110315931.7, application date: October 18, 2011, applicant: Zhejiang University, invention name: a negative electrode of a lithium-ion battery and its preparation method and A divisional application for a battery using the negative electrode. technical field [0002] The invention relates to a lithium ion battery, in particular to a high-performance negative electrode directly used as a lithium ion battery, a preparation method thereof and a battery using the negative electrode. Background technique [0003] Lithium-ion batteries are green energy developed in the 1990s. Compared with traditional secondary batteries such as lead-acid, nickel-cadmium, and nickel-metal hydride, lithium-ion batteries have high reversible capacity, excellent cycle performance, and high energy density. It has been favored for its advantage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/04H01M10/0525
CPCH01M4/0402H01M4/131H01M4/1391H01M10/0525H01M2004/027Y02E60/10
Inventor 潘洪革高明霞
Owner ZHEJIANG UNIV
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