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A kind of porous copper foil for lithium ion battery

A lithium-ion battery, porous copper technology, applied in the field of porous copper foil, can solve the problems of limited surface area, general adsorption capacity, affecting the performance and life of lithium-ion batteries, etc.

Active Publication Date: 2020-08-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, the surface area of ​​traditional non-porous copper foil is limited, the adsorption capacity is average, it is difficult to carry more negative electrode materials, which directly affects the performance and life of lithium-ion batteries; traditional non-porous copper foil, the wettability of electrolyte to high-density negative electrode materials is difficult to improve ; The traditional non-porous copper foil can not take into account the requirements of quality, volume and performance, and it is difficult to meet the requirements of the development of circuit integration

Method used

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  • A kind of porous copper foil for lithium ion battery
  • A kind of porous copper foil for lithium ion battery
  • A kind of porous copper foil for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Porous copper foil microporous design as attached figure 2 , the diameter of the large micropore is 30 μm, the diameter of the small micropore is 7.5 μm, and the distance between the two nearest neighbor large micropores is 90 μm. The oxygen position, that is, every three large micropores form an equilateral triangle shape, and the small micropores are located at the boron position arranged in the boron-oxygen three-membered ring, that is, a small micropore is placed in the center of the equilateral triangle constructed by every three large micropores. The micropores, thus, the distance between the two nearest neighbors is 51.96 μm; such repeated arrangement constitutes the hole arrangement scheme of the porous copper foil of this embodiment. For the convenience of expression, the porous arrangement scheme of this embodiment is referred to as configuration II hereinafter.

Embodiment 2

[0031] The difference from Example 1 is that the diameter of the large micropore is 40 μm, the diameter of the small micropore is 10 μm, the distance between two nearest neighbors of large micropores is 120 μm, and the distance between two nearest neighbors of small micropores is 69.28 μm. Hereinafter referred to as configuration III for the porous arrangement scheme of this embodiment, the design diagram is shown in the attached image 3 .

Embodiment 3

[0033]The difference from Example 1 is that the diameter of the large micropore is 50 μm, the diameter of the small micropore is 12.5 μm, the distance between the two nearest large micropores is 150 μm, and the distance between the two nearest neighbor small micropores is 86.60 μm. Hereinafter referred to as configuration IV, the porous arrangement scheme of this embodiment is referred to as configuration IV, and the design diagram is as attached Figure 4 .

[0034] The inventor adopts ANSYS to analyze and simulate the intensity situation of above each embodiment and comparative example, concrete method is:

[0035] The thickness of the design model is 8 μm, and the area is 1*1 mm 2 , elastic modulus 119 GPa, Poisson's ratio 0.326, density 8900g / cm 3 . Constraints in the x and z directions are added to the left edge, and uniform force is applied to the right edge.

[0036] Define f as the tensile force per unit length of the right edge when the maximum internal stress rea...

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Abstract

The invention discloses a porous copper foil for a lithium ion battery. Micropores penetrating through the upper and lower surfaces of the porous copper foil are regularly distributed on the porous copper foil. The micropores include two kinds of micropores having different diameters. The large and small micropores are arranged in a shape the same as that of a boron-oxygen three-membered ring in borate glass, wherein the large micropores are located at the oxygen position of the boron-oxygen three-membered ring, and the small micropores are located at the boron position of the boron-oxygen three-membered ring. The diameter of each small micropore is a quarter of that of a large micropore. A distance between the nearest two large micropores is three times the diameter of the large micropore. The design of the invention increases the pore area per unit area, improves a battery capacity under the premise of ensuring sufficient strength, increases the load capacity and the adsorption capacity of the anode material on the copper foil per unit area, and takes account of the electrode quality and the performance requirements to satisfy the demand for the circuit integration development.

Description

technical field [0001] The invention relates to a copper foil for a lithium ion battery, in particular to a porous copper foil. Background technique [0002] With the advent of the environmental crisis, coal resources are becoming increasingly scarce, and burning coal to generate electricity will emit a large amount of harmful gases to pollute the atmospheric environment. Disaster weather such as smog is becoming more and more serious, and environmental protection is urgent. With the development of new energy vehicles, the demand for lithium-ion batteries has increased dramatically. In addition, lithium-ion batteries are also widely used in electrical appliances such as mobile phones and notebook computers, becoming a new sustainable and environmentally friendly power generation method. [0003] Lithium-ion batteries mainly rely on the intercalation or deintercalation of lithium ions in the positive or negative electrode materials to work. The negative electrode usually co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/80H01M10/0525C25D1/04
CPCY02E60/10
Inventor 姚悦胡春咏姜子玮韩屾程远王宏涛刘嘉斌
Owner ZHEJIANG UNIV