Current collector etched foil and preparation method thereof, electrode and lithium battery

A technology for current collectors and lithium batteries, applied in the direction of electrode carriers/collectors, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of increased electrode interface impedance, powdered electrode materials, and battery performance degradation The effect of increased force, increased mechanical flexibility, and light weight ratio

Active Publication Date: 2022-07-12
FOSHAN SINO SCI NANO TECH MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the smooth surface of the aluminum foil and the electrode material particles is not easy to form a "mesh" interface that intersects with each other, and there is a rolling oil film and a passivation film on the surface of the aluminum foil, which makes the adhesion between the electrode material particles and the current collector two-phase interface weak. , uneven contact, poor conductivity; especially after the electrode absorbs liquid, the expansion degree of the electrode material layer increases, which increases the electrode interface impedance and reduces the conductivity, and even causes the electrode material to pulverize or fall off, resulting in a decline in battery performance

Method used

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  • Current collector etched foil and preparation method thereof, electrode and lithium battery

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preparation example Construction

[0027] The application provides a preparation method of a current collector etched foil, comprising the following steps:

[0028] S1. Provide metal foil;

[0029] In the present application, the thickness of the metal substrate is preferably 10 to 20 μm. In other embodiments of the present application, the thickness of the metal substrate may also be less than 10 μm or greater than 20 μm.

[0030] The metal substrate of the present application is aluminum foil or copper foil, but is not limited thereto. Due to the serious corrosion problem of aluminum foil at low potential, it is mainly used for positive current collectors. Among them, the impure composition of aluminum foil will cause the surface oxide film to be not dense and cause pitting corrosion, and even LiAl alloy will be formed.

[0031] In order to effectively remove impurities, oil stains and oxide layers on the aluminum foil or copper foil, improve the cleanliness and surface wetting tension of the current collec...

Embodiment 1

[0064] A preparation method of a current collector etched foil, comprising the following steps:

[0065] S1. Provide an aluminum foil substrate with a thickness of 12 μm;

[0066] S2. The unwinding machine is used to release the rolled aluminum foil substrate to the tension roller, and the aluminum foil substrate is transported to the pickling tank, alkali cleaning tank, pickling tank and Cleaning tank; wherein, the pickling solution in the pickling tank includes 1.1wt% HF and 2.9wt% H 2 SO 4 , the alkaline washing solution in the alkaline washing tank includes 0.8wt% Ca(OH) 2 and 3.2wt% LiOH, the cleaning tank contains deionized water at a temperature of 50 °C;

[0067] S3, drying the aluminum foil substrate at a speed of 130 m / min after the etching process in step S2 at 130° C. to obtain a current collector etched aluminum foil.

Embodiment 2

[0069] A preparation method of a current collector etched foil, comprising the following steps:

[0070] S1. Provide an aluminum foil substrate with a thickness of 12 μm;

[0071] S2. The unwinding machine is used to release the rolled aluminum foil substrate to the tension roller, and the aluminum foil substrate is transported to the pickling tank, alkali cleaning tank, pickling tank and Cleaning tank; wherein, the pickling solution in the pickling tank includes 1.2wt% HF and 3.3wt% H 2 SO 4 , the alkaline washing solution in the alkaline washing tank includes 1wt% Ca(OH) 2 and 3.5wt% LiOH, the cleaning tank contains deionized water at a temperature of 55 °C;

[0072] S3, drying the aluminum foil base material after the etching treatment in step S2 at 140° C. to obtain a current collector etched aluminum foil.

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Abstract

The invention discloses a current collector etched foil and a preparation method thereof, an electrode and a lithium battery, and the preparation method of the etched metal foil comprises the following steps: providing a metal foil; the metal foil is subjected to etching treatment, and the metal foil sequentially enters a pickling tank, an alkaline washing tank, a pickling tank and a cleaning tank; and carrying out drying treatment on the etched metal foil. The preparation method is simple, and the etched metal foil is large in specific surface area, small in resistance and good in adhesive force with an electrode layer.

Description

technical field [0001] The present application relates to the technical field of lithium batteries, and in particular, to a current collector etched foil, a preparation method thereof, an electrode, and a lithium battery. Background technique [0002] As an environmentally friendly lithium secondary battery, lithium-ion batteries have been widely used in various electronic fields such as 3C field and EV field due to their high specific energy, high specific power, long cycle life, and good high and low temperature performance. Wait. [0003] The current collector is one of the indispensable components in the lithium battery. It can not only carry the active material, but also collect and output the current generated by the electrode active material, which is beneficial to reduce the internal resistance of the lithium battery and improve the coulombic efficiency of the battery. , cycle stability and rate capability. The current collector is the key material of the lithium b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/13H01M10/0525C23F1/18C23F1/20C23G1/10C23G1/12C23G1/20C23G1/22
CPCH01M4/661H01M4/80H01M4/13H01M10/0525C23F1/18C23F1/20C23G1/125C23G1/103C23G1/20C23G1/22Y02E60/10
Inventor 刘福海
Owner FOSHAN SINO SCI NANO TECH MATERIAL CO LTD
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