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Electrode with pit patterns for secondary battery, and preparation method and application of electrode

A secondary battery and electrode technology, which is applied in the field of secondary battery electrodes and its preparation, can solve the problems of battery internal resistance increase, electrode pulverization failure, large volume change, etc., to improve safety performance and cycle life, and maintain stability The effect of safety and integrity, simplicity of preparation method

Active Publication Date: 2017-05-31
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no real effective method to avoid metal dendrite growth has been found so far
[0004] In addition, metal or non-metal electrode materials based on alloying reactions usually undergo large volume changes when alloying and dealloying with the above-mentioned metal ions, resulting in electrode pulverization failure and increased internal resistance of the battery, resulting in shortened battery cycle life.

Method used

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  • Electrode with pit patterns for secondary battery, and preparation method and application of electrode
  • Electrode with pit patterns for secondary battery, and preparation method and application of electrode
  • Electrode with pit patterns for secondary battery, and preparation method and application of electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0068] This example is used to illustrate the electrode of the present invention and its preparation method and application.

[0069] 1. Preparation of copper electrodes with pit pattern (recessive pit pattern)

[0070] A pit array structure is processed on the flat surface of the copper foil by laser etching, wherein the laser wavelength used in the laser etching method is 355nm, the laser power is 3W, and the single hole drilling time is 0.5ms.

[0071] Such as Figure 6 As shown, the prepared pits are cylindrical, with a pore diameter (projected diameter of the top surface) of 6 μm, a depth of 5 μm, and a center-to-center distance of adjacent pits of 20 μm.

[0072] The above copper electrodes were ultrasonically cleaned with citric acid, deionized water and alcohol respectively, and then the cleaned copper electrodes were dried in a vacuum oven at 110°C for 6 hours.

[0073] 2. Lithium metal secondary battery

[0074] With the copper electrode prepared in this embodimen...

Embodiment 2

[0082] This example is used to illustrate the electrode of the present invention and its preparation method and application.

[0083] 1. Preparation of copper electrodes with pit pattern (recessive pit pattern)

[0084] A pit array structure is processed on the flat surface of the copper foil by laser etching, wherein the laser wavelength used in the laser etching method is 355nm, the laser power is 3W, and the perforation time of a single hole is 3.2ms.

[0085] Such as Figure 10 As shown, the prepared pits are cylindrical, with a pore diameter (projected diameter of the top surface) of 15 μm, a depth of 5 μm, and a center-to-center distance of 30 μm.

[0086] The above copper electrodes were ultrasonically cleaned with citric acid, deionized water and alcohol respectively, and then the cleaned copper electrodes were dried in a vacuum oven at 110°C for 6 hours.

[0087] 2. Lithium metal secondary battery

[0088] With the copper electrode prepared in this embodiment as ne...

Embodiment 3

[0096] This example is used to illustrate the electrode of the present invention and its preparation method and application.

[0097] 1. Preparation of titanium electrodes with pit patterns (recessive pit patterns)

[0098] A cuboid pit array structure is processed on the flat surface of the titanium foil by using the focused ion beam etching method. Such as Figure 12 As shown, the dimensions of the cuboid pits are: the projected side length of the top surface is 5 nm, the pit depth is 10 nm, and the pit center distance is 10 nm.

[0099] The above titanium electrodes were ultrasonically cleaned with citric acid, deionized water and alcohol respectively, and then the cleaned metal titanium substrate was dried in a vacuum oven at 110° C. for 6 h.

[0100] 2. Lithium metal secondary battery

[0101] With the titanium electrode prepared in this embodiment as the negative electrode, with LiCoO 2 As the positive electrode material, the concentration is 1mol L -1 LiPF 6 A sol...

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Abstract

The invention discloses an electrode for a secondary battery. At least one of an upper surface and a lower surface of the electrode is provided with a plurality of pits, the top projection area of each pit is 25 square nanometers to 250000 square micrometers, a depth of each pit is 10 nanometers to 500 micrometers, and a central distance between two adjacent pits is 10 nanometers to 1000 micrometers. When used as a secondary battery electrode, the electrode can effectively limit an electrochemical active metal such as metal lithium in the pits, so that dendritic crystals (for example, lithium dendritic crystals) of the electrochemical active metal can be prevented from appearing on the surface of the electrode, the huge volume deformation of the electrode in an alloy reaction process can be buffered, and the safety performance and cycle life of the metal secondary battery can be improved and prolonged. The invention also provides a preparation method and application of the electrode.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and in particular relates to an electrode with a pit pattern for a secondary battery, a preparation method and application thereof. Background technique [0002] With the vigorous development of portable electronic devices and electric vehicles, people's demand for energy storage devices with high energy density is increasing. Secondary batteries based on intercalation chemistry are difficult to break through the capacity bottleneck due to the limitation of the crystal structure of the intercalation host. Therefore, people turn their research and development focus to various metal secondary batteries based on the deposition and stripping of active metals, such as lithium-sulfur batteries, sodium-sulfur batteries, lithium-air (oxygen, the same below) batteries, sodium-air batteries, zinc- Air battery, magnesium (ion) battery, aluminum (ion) battery, zinc-manganese dioxide (MnO 2 ) secondary...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/04H01M10/05H01M12/08
CPCH01M4/043H01M4/0438H01M4/13H01M10/05H01M12/08Y02E60/10
Inventor 李叶晶王兆翔陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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