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Lithium ion battery positive current collector high in safety performance, preparing method thereof and lithium ion battery

A technology for positive current collectors and lithium-ion batteries, applied in the direction of electrode carriers/collectors, battery electrodes, secondary batteries, etc., can solve the problems of small short-circuit resistance, fire and explosion, thermal runaway, etc., to reduce current value and increase resistance , Improve the effect of cycle life

Inactive Publication Date: 2015-10-07
GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resistance of the positive electrode active material diaphragm in ordinary lithium-ion batteries is about 1-2Ω / cm 2 , while the positive electrode aluminum current collector, negative electrode copper current collector and negative electrode active material diaphragm resistance are extremely small. When the battery is subjected to mechanical damage such as severe extrusion, impact or piercing by sharp objects under abnormal conditions, it may cause a short circuit, and the positive electrode collector The short-circuit resistance formed by the fluid aluminum foil and the negative electrode diaphragm is small, and a huge short-circuit current may be generated, and a large amount of heat is released instantaneously and concentrated at the short-circuit point, which will inevitably lead to serious thermal runaway, and it is very likely to ignite the electrolyte and negative active materials. fire and explosion hazard

Method used

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  • Lithium ion battery positive current collector high in safety performance, preparing method thereof and lithium ion battery
  • Lithium ion battery positive current collector high in safety performance, preparing method thereof and lithium ion battery
  • Lithium ion battery positive current collector high in safety performance, preparing method thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Using aluminum foil with a thickness of 25 μm as the base material, the aluminum foil was ultrasonically oscillated in ethanol for 15 minutes to remove oil stains on the aluminum foil, and then left to stand in 0.5 mol / L sodium hydroxide solution for 2 minutes to remove the natural formation on the surface of the aluminum foil. The oxide layer was then rinsed with distilled water for 15 seconds to obtain a pretreated aluminum foil. With the pretreated aluminum foil as the anode and the graphite plate as the cathode, in 0.5 mol / L sulfuric acid aqueous solution, the voltage was 30 V, and the current density was 20 mA / cm 2 , oxidized for 25 minutes, then rinsed with distilled water for 15 seconds, and dried with hot air at 55 °C to obtain an aluminum foil coated with a porous alumina resistance layer. Pore ​​structure (such as figure 1 shown), the pore size of the blind hole structure is 1–5 μm.

[0040] Preparation of lithium-ion batteries

[0041] The aluminum foil wi...

Embodiment 2

[0046]Using aluminum foil with a thickness of 35 μm as the base material, the aluminum foil was ultrasonically oscillated in acetone for 10 minutes to remove oil stains on the aluminum foil base material, and then left to stand in 0.25 mol / L potassium hydroxide solution for 1 minute to remove the natural formation on the surface of the aluminum foil The oxide layer was then rinsed with distilled water for 10 seconds to obtain a pretreated aluminum foil. With the pretreated aluminum foil as the anode and the graphite plate as the cathode, in a mixed aqueous solution of 0.1 mol / L sulfuric acid, 0.05 mol / L phosphoric acid and 0.02 mol / L 2-hydroxypropionic acid, the voltage was 20 V and the current density was 15 mA / cm 2 , oxidized for 20 minutes, then rinsed with distilled water for 15 seconds, and dried with hot air at 55°C to obtain an aluminum foil positive current collector with a porous resistive layer.

[0047] The thickness of the porous alumina resistance layer was detec...

Embodiment 3

[0051] Using aluminum foil with a thickness of 20 μm as the base material, the aluminum foil was ultrasonically oscillated in acetone for 10 minutes to remove the oil on the aluminum foil base material, and then mixed solution of 0.1 mol / L sodium hydroxide and 0.05 mol / L sodium bicarbonate Stand in the middle for 1 minute to remove the naturally formed oxide layer on the surface of the aluminum foil, and then rinse with distilled water for 10 seconds to obtain a pretreated aluminum foil. With the pretreated aluminum foil as the anode and the graphite plate as the cathode, in a mixed aqueous solution of 0.1 mol / L oxalic acid and 0.02 mol / L 2-hydroxypropionic acid, the voltage was 12 V and the current density was 15 mA / cm 2 , oxidized for 20 minutes, then rinsed with distilled water for 15 seconds, and dried with hot air at 55°C to obtain an aluminum foil positive current collector with a porous resistive layer.

[0052] The thickness of the porous alumina resistance layer was d...

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Abstract

The invention provides a lithium ion battery positive current collector high in safety performance, a preparing method thereof and a lithium ion battery. The positive current collector comprises an aluminum layer and a porous anodic alumina resistive layer which covers the surface of the aluminum layer. The thickness of the porous anodic alumina resistive layer is 10-100 nm. The porous structure of the porous anodic alumina resistive layer is a blind hole structure. The diameter of blind holes is 0.01-5 microns. The porous anodic alumina resistive layer can effectively increase the resistance of the positive current collector so that the current value generated when a short circuit happens to the battery can be lowered, and accordingly the temperature is decreased when the short circuit happens to the battery and the dangers of firing and exploding caused by heat generated by the battery is avoided. In addition, the adhesive strength of the positive current collector and positive active substances can be improved through the blind hole structure of the positive current collector, so that the probability of falling of the positive active substances during charging and discharging is lowered, and accordingly the cycle life of the lithium ion battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, and more specifically, relates to a high-safety lithium-ion battery cathode current collector, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in various portable electronic products due to their advantages of environmental protection, large capacity, and high volumetric energy density. [0003] The interior of a lithium-ion battery is mainly composed of a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte. The positive electrode sheet includes a positive electrode collector (aluminum foil) and a positive electrode active material (lithium cobaltate, lithium manganate, etc.), and the negative electrode sheet includes a negative electrode collector ( copper foil) and negative active material (graphite, etc.). The resistance of the positive electrode active material diaphra...

Claims

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Application Information

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IPC IPC(8): H01M4/64H01M4/66H01M4/80H01M10/0525
CPCH01M4/64H01M4/667H01M4/80H01M10/0525Y02E60/10
Inventor 杨伟薛建军崔燕胡新发邝子朋夏信德
Owner GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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