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Lithium ion battery negative electrode current collector and preparation method thereof

A technology for lithium-ion batteries and current collectors, applied in battery electrodes, electrode carriers/current collectors, non-aqueous electrolyte battery electrodes, etc., can solve problems such as poor electron transmission performance, low mass ratio, and complicated preparation methods, and achieve simple equipment , reduce the mass ratio, and have a wide range of applications

Pending Publication Date: 2022-03-15
SHENZHEN UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is a lithium-ion battery negative electrode current collector and its preparation method, aiming to solve the problems of low mass ratio of active components of the existing current collector, poor electron transport performance and complicated preparation methods. question

Method used

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  • Lithium ion battery negative electrode current collector and preparation method thereof
  • Lithium ion battery negative electrode current collector and preparation method thereof
  • Lithium ion battery negative electrode current collector and preparation method thereof

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preparation example Construction

[0044] The present invention also provides a preparation method of a lithium ion battery negative electrode current collector, comprising the steps of:

[0045] S1, immersing the polyimide film in a concentrated sodium hydroxide solution to obtain a pretreated polyimide film;

[0046] S2, immersing the pretreated polyimide film in a silver nitrate solution to obtain an activated polyimide film;

[0047] S3, immersing the activated polyimide film in an electroless copper plating solution and contacting it for a predetermined time to obtain a lithium ion battery negative electrode current collector.

[0048] Specifically, the present invention prepares polyimide copper-plated film by electroless plating and mainly comprises three steps: pretreatment, activation and copper deposition (as figure 1 shown). In step S1, after the polyimide is pretreated with sodium hydroxide, the imide rings on its surface are opened and hydrolyzed to form carboxyl groups, and the generated carboxy...

Embodiment 1

[0059] 1. Preparation of current collector: First, immerse the polyimide film in a concentrated sodium hydroxide solution (15% by mass) for 60 minutes, then rinse it with deionized water and then immerse it in a silver nitrate solution (1g / L) 10 minutes, and finally immersed in the electroless copper plating solution for 5 minutes to obtain a polyimide copper plating film. Wherein, the electroless copper plating solution is copper sulfate pentahydrate (15g / L), potassium sodium tartrate (14g / L), disodium edetate (20g / L), sodium hydroxide (15g / L), Potassium ferricyanide (10mg / L), 2,2-bipyridine (20mg / L) and formaldehyde solution (15mL / L) were dissolved in deionized water at room temperature to obtain the lithium ion battery negative electrode current collector.

[0060] 2. Preparation of lithium titanate electrode: First, the active material lithium titanate, carbon black conductive agent and polymer binder polyvinylidene fluoride are mixed and stirred with an appropriate amount...

Embodiment 2

[0063] On the basis of Example 1, the time of immersion in the electroless copper plating solution was adjusted to 10, and the rest of the preparation process parameters and process steps were the same as in Example 1, and the lithium ion battery negative electrode current collector, lithium titanate electrode and button battery were prepared.

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Abstract

The invention provides a lithium ion battery negative electrode current collector and a preparation method thereof. The lithium ion battery negative electrode current collector comprises a polyimide film and copper layers coating two sides of the polyimide film. The polyimide copper-plated film has high flexibility and low density of polyimide and high conductivity of copper at the same time, so that the mass ratio of inactive components in the current collector can be effectively reduced, and the rough surface appearance of the polyimide copper-plated film can also improve interface electron transmission; the reduced contact resistance of the current collector and the electrode layer is reduced, so that the electrode taking the polyimide copper-plated film as the current collector can show higher specific discharge capacity, better rate capability and cycling stability. Moreover, the invention also provides a preparation method of the lithium ion battery negative electrode current collector, two thin copper layers are coated on two sides of the polyimide film through chemical plating, and the preparation method has the advantages of low cost, simple equipment and wide application range.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery negative electrode current collector and a preparation method thereof. [0002] technical background [0003] With the miniaturization of portable electronic instruments and the rapid development of electric vehicles, there is an increasing demand for lithium-ion batteries with higher energy density and rate performance. As an indispensable part of lithium-ion batteries, current collectors can load electrode materials and conduct electrons between electrode materials and external circuits, which has a huge impact on the overall performance of lithium-ion batteries. However, the current collector has two major problems to be solved: large mass and weak interaction with the electrode layer. First of all, commercial lithium-ion battery current collectors are made of high-density metal materials, such as aluminum (2.7g / cm 3 ) and copper (8.96g / cm 3 ). The...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/13H01M10/0525
CPCH01M4/667H01M4/13H01M10/0525H01M2004/027Y02E60/10
Inventor 符显珠潘晨骆静利
Owner SHENZHEN UNIV
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