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Negative electrode current collector as well as preparation method and application thereof

A technology of current collector and negative electrode, applied in the field of negative current collector, its preparation can solve the problems of reducing battery energy conversion efficiency, active material utilization rate battery cycle life, limiting battery application, shortening battery life and other problems

Inactive Publication Date: 2020-12-18
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, during the deposition and dissolution of active metals, the volume and surface area of ​​metal electrodes change greatly, and the side reactions between active metals and electrolytes reduce the energy conversion efficiency, active material utilization, and battery cycle life of the battery. Limits battery applications, hence the need to protect the active metal on the anode
The protective layer (naturally formed or artificially prepared) covering the negative electrode current collector or the surface of the active metal negative electrode may also lead to uneven deposition of the active metal, even the active metal is deposited on this protective layer
In addition, the huge volume change that occurs when the metal deposition dissolves makes the negative electrode / electrolyte interface contact of the battery worse, increases the internal resistance of the battery and the polarization of the battery, reduces the energy conversion efficiency of the battery, and shortens the battery life.

Method used

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  • Negative electrode current collector as well as preparation method and application thereof
  • Negative electrode current collector as well as preparation method and application thereof
  • Negative electrode current collector as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0082] This example is used to illustrate a preparation method of the negative electrode current collector of the present invention.

[0083] Preparation method: use low-temperature plasma surface treatment technology to inject carbon into the copper-based current collector to form Cu x C induction layer (x=0.1~5.0). in CH 4 As a carbon source, the workpiece temperature is 300-1000°C, and the back-bottom air pressure is 10 3 ~10 5 Pa, working air pressure 0.01-0.5Pa, gas source purity 99%-99.99%, injection dose 10 15 ~10 18 ions / cm 2 .

[0084] In a preferred embodiment, CH 4 As a carbon source, the workpiece temperature is 600°C, the back and bottom pressure is 2000Pa, the working pressure is 0.2Pa, the purity of the gas source is 99%, and the injection dose is 10 16 ions / cm 2 , forming an induced layer Cu with a thickness of 30 nm 2 c.

[0085] image 3 The morphology of the flat current collector substrate (foil) of Example 1 is shown.

Embodiment 2

[0087] This example is used to illustrate a preparation method of the negative electrode current collector of the present invention.

[0088] Preparation method: use low-temperature plasma surface treatment technology to inject carbon into the surface of stainless steel-based current collector to form Fe x C induction layer (x=0.1~5). Use CH 4 As a carbon source, the workpiece temperature is 300-1000°C, and the back-bottom air pressure is 10 3 ~10 5 Pa, working air pressure 0.01-0.5Pa, gas source purity 99-99.99%, injection dose 10 15 ~10 18 ions / cm 2 .

[0089] In a preferred embodiment, CH 4 As a carbon source, the workpiece temperature is 700°C, and the back-bottom air pressure is 10 4 Pa, working pressure 0.2Pa, gas source purity 99.5%, injection dose 5×10 16 ions / cm 2 , forming an induced layer of Fe with a thickness of 50 nm 2 c.

Embodiment 3

[0091] This example is used to illustrate a preparation method of the negative electrode current collector of the present invention.

[0092] Preparation method: use low-temperature plasma surface treatment technology to inject nitrogen into the surface of titanium-based current collector to form Ti x N induction layer (x=0.1~5). Use nitrogen (N 2 ) is the nitrogen source, the workpiece temperature is 300-1000°C, and the back-to-bottom air pressure is 10 3 ~10 5 Pa, working air pressure 0.01~0.5Pa, gas source purity 99.00~99.99%, injection dose 10 15 ~10 18 ions / cm 2 .

[0093] In a preferred embodiment, with nitrogen (N 2 ) is the nitrogen source, the workpiece temperature is 1000°C, and the back and bottom air pressure is 2×10 4 Pa, working air pressure 0.3Pa, gas source purity 99%, injection dose 10 16 ions / cm 2 , forming an induction layer TiN with a thickness of 20nm.

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Abstract

The invention provides a negative electrode current collector. The negative electrode current collector comprises a current collector base material and an induction layer covering the surface of the current collector base material, the induction layer is used for inducing metal deposition, and the invention also provides a preparation method and application of the negative electrode current collector. The method is suitable for the secondary battery taking various metals (lithium, sodium, magnesium, aluminum, potassium and zinc) as negative (positive) active substances. By using the current collector (negative electrode) provided by the invention, dendritic crystal growth on the negative electrode of the battery and side reaction between active metal and electrolyte can be effectively inhibited, the safety and the cycle efficiency of the secondary battery are improved, and the cycle life of the secondary battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a negative electrode collector, its preparation method and application. Background technique [0002] With the development of portable electronic devices and electric vehicles, the demand for energy storage devices with high energy density is becoming increasingly urgent. Secondary batteries based on intercalation chemistry (such as lithium-ion batteries) suffer from energy density bottlenecks due to the limitation of the crystal structure of the lithium storage host. Therefore, people turn the focus of research and development to secondary batteries based on active metal deposition and stripping with various (light) metals as the negative electrode (or anode) active material, such as lithium secondary batteries (the negative electrode active material is metal lithium, and the positive electrode ( Or called cathode) active materials are oxides, fluorides, p...

Claims

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Application Information

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IPC IPC(8): H01M4/66
CPCH01M4/661H01M4/663H01M4/667H01M4/669Y02E60/10
Inventor 王兆翔刘泽鹏杨高靖张思蒙王雪锋陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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