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Flexible current collector, lithium ion battery pole piece and preparation method thereof

A flexible current collector, lithium-ion battery technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problems that the flexibility and energy density of flexible electrodes cannot be balanced, and affect the performance of lithium-ion batteries. Good application prospects, low cost, and the effect of avoiding cracking

Active Publication Date: 2021-06-18
BEIJING GRAPHENE INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] A main purpose of the present disclosure is to overcome at least one defect of the above-mentioned prior art, and provide a flexible current collector, a lithium-ion battery pole piece and a preparation method thereof, so as to solve the problem that the flexibility and energy density of the existing flexible electrodes cannot be balanced. Problems that affect the performance of lithium-ion batteries

Method used

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  • Flexible current collector, lithium ion battery pole piece and preparation method thereof
  • Flexible current collector, lithium ion battery pole piece and preparation method thereof
  • Flexible current collector, lithium ion battery pole piece and preparation method thereof

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preparation example Construction

[0047] image 3 It is a flow chart of the preparation process of a lithium-ion battery pole piece according to an embodiment of the present disclosure. Such as image 3 As shown, the preparation method of the aforementioned lithium-ion battery pole piece includes: sequentially coating the second flexible current collector layer and the third flexible current collector layer on the first flexible current collector layer, and obtaining the flexible current collector after drying once; The active material, the conductive agent and the binder are placed in a solvent and mixed to obtain a slurry, the slurry is coated on the surface of the third flexible current collector layer of the flexible current collector, and after secondary drying, a lithium ion battery pole piece is obtained.

[0048] The preparation method of the lithium-ion battery pole piece of the present disclosure will be described in detail below.

[0049] Firstly, the first flexible current collector layer is prov...

Embodiment 1

[0056] 1) Apply a layer of conductive ink with a thickness of 1 μm on the surface of the highly conductive graphene paper with a thickness of 5 μm by scraping, and then stick a layer of carbon felt with a thickness of 80 μm on the surface of the conductive ink to adjust the roller pressure , flatten the three-layer current collector, and dry the adhered current collector at 70°C for 2 hours to obtain a flexible current collector.

[0057] 2) Add lithium cobaltate, carbon nanotubes, polytetrafluoroethylene, and lithium titanate, carbon nanotubes, and polytetrafluoroethylene into NMP in a ratio of 80:10:10 and stir evenly. The mass ratio of solid to NMP The control is 1:2, and the adjusted positive electrode slurry and negative electrode slurry are obtained.

[0058] 3) Coat the positive electrode slurry and the negative electrode slurry obtained in step 2) on the flexible current collector carbon felt layer in step 1) by scraping, blow and dry for 2 hours at 70°C to remove NMP,...

Embodiment 2

[0061]1) On the surface of the highly conductive carbon nanotube paper with a thickness of 20 μm, a layer of conductive silver glue with a thickness of 5 μm is applied by scraping, and then a layer of carbon felt with a thickness of 150 μm is adhered on the surface of the conductive silver glue. Press against the roller to flatten the three-layer current collector. The adhered current collector was air-dried at 100°C for 5 hours to obtain a flexible current collector.

[0062] 2) Add lithium nickelate, conductive carbon black, polyvinylidene fluoride, and graphite, conductive carbon black, and polyvinylidene fluoride into absolute ethanol at a ratio of 95:2.5:2.5 and stir evenly. The mass ratio is controlled to be 1:4, and the adjusted positive electrode slurry and negative electrode slurry are obtained.

[0063] 3) Apply the positive electrode slurry and the negative electrode slurry obtained in step 2) to the flexible current collector carbon felt layer in step 1) respectiv...

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Abstract

The disclosure provides a flexible current collector, a lithium ion battery pole piece and a preparation method thereof, the flexible current collector includes a first flexible current collector layer, a second flexible current collector layer and a third flexible current collector layer, the second flexible current collector layer is located on the first flexible current collector layer, and the third flexible current collector layer is located on the second flexible current collector layer, wherein the materials of the first flexible current collector layer and the second flexible current collector layer are two-dimensional conductive materials, and the second The materials of the three flexible current collector layers are one-dimensional conductive materials. The flexible current collector of the present disclosure utilizes the synergistic effect of one-dimensional and two-dimensional conductive structures to realize fast charging and discharging of electrodes, and at the same time, the special hierarchical structure design can effectively stabilize the electrode structure, taking into account good flexibility and high energy density. The preparation method of lithium-ion battery pole pieces is simple, low in cost, and has good application prospects.

Description

technical field [0001] The disclosure relates to the field of batteries, in particular to a flexible current collector, a lithium-ion battery pole piece and a preparation method thereof. Background technique [0002] In recent years, with the emergence of flexible, wearable and portable electronic products, there is an urgent need for electronic products to develop in the direction of miniaturization, diversity and variability. Flexible wearable portable electronic products have become the trend of future development. The flexible lithium-ion battery used in conjunction with it has developed slowly, which has become a restrictive factor for the development of high-end flexible electronic devices. Most of the existing traditional batteries have shortcomings in rigidity and thickness, which limit their use in the field of wearable devices. Therefore, it is urgent to develop a practical flexible lithium-ion battery. [0003] Lithium-ion batteries are mainly composed of posit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/131H01M4/136H01M4/1391H01M4/1397H01M10/0525
CPCH01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/663H01M4/667H01M4/668H01M10/0525Y02E60/10
Inventor 魏迪沈伟李科吕扬阳徐涛
Owner BEIJING GRAPHENE INST