Folding graphene current collector and preparation method thereof, and lithium ion battery

A technology of lithium-ion batteries and current collectors, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problems of limited contact area between current collectors and active materials, high cost of current collectors, and increase the contact area Compared with the bonding force, the effect of improving the rate performance and reducing the resistance

Active Publication Date: 2021-03-16
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the defects of high cost of current collectors and limited contact area between current collectors and active materials, and provide a method to improve the electrode sheet resistance, reduce the internal resistance of the battery, increase the contact area ratio between current collectors and active materials, and improve Battery Specific Energy Density, Folded Graphene Current Collectors for Lower Battery Costs

Method used

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  • Folding graphene current collector and preparation method thereof, and lithium ion battery
  • Folding graphene current collector and preparation method thereof, and lithium ion battery
  • Folding graphene current collector and preparation method thereof, and lithium ion battery

Examples

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preparation example Construction

[0040] see Figure 5 , the invention provides a kind of preparation method of folded graphene current collector, described preparation method comprises the following steps:

[0041]1) Preparation of braided current collector: select a metal wire with a diameter of R and an aluminum foil with a length, width and height of m*n*h, weave and grow into a network structure with a width of b, and record it as the current collector X1; first make X1 Spray graphene solution on the surface, dry it, and record it as current collector X2; then pass X2 through the conductive fiber filament solution atomization area, and dry it to obtain current collector X3;

[0042] 2) Prepare a coated current collector, denoted as Y, wherein the coating is made of graphite; the non-woven part of X3 obtained in step 1) is combined with the non-coated part of Y by welding to obtain a foldable graphene current collector, It is recorded as Z; among them, Y is one layer, and the number of X3 layers is 1-100 ...

Embodiment 1

[0046] Choose a double-sided coated aluminum foil with a thickness of 0.02mm, a length of 100000mm, and a width of 300mm. The coating is graphite and the coating thickness is 0.0002mm. Choose the positive electrode LFP: (carbon black+graphene): PVDF=94: (1 +1): The positive electrode slurry prepared by 4 formulas is prepared into a positive electrode sheet with a length, width, and thickness of 150mm*150*0.2mm that can be assembled into a battery after coating, drying, rolling, and slicing; the selected thickness is 0.01mm, and the length is 100000mm, 305mm wide bare copper foil, choose negative electrode graphite: PVDF = 96: 4 negative electrode slurry, after coating, drying, rolling and slicing, etc., the length, width and thickness of the assembled battery are 152.5mm*152*0.15 mm negative pole piece; then assembled into a battery.

Embodiment 2

[0048] This embodiment provides a method for preparing a folded graphene current collector,

[0049] 1) Preparation of current collector X1: Select an aluminum wire with an R of 0.005mm and an aluminum foil with a length, width and height of 100000*10*0.005mm, such as Figure 7 As shown, weaving a current collector with a 0.02mm and b 0.02mm network structure with textile technology, the current collector is 100000mm long and 300mm wide;

[0050] 2) Preparation of current collector X3: select graphene slurry with a solid content of 5%, and spray it evenly on X1 with a spraying machine, wherein the non-woven part of X1 is not sprayed, and the sprayed current collector is dried in a drying tunnel to obtain Current collector X2, and then let X2 pass through the atomization area with 5% conductive fiber filament solution, so that the conductive fiber filaments are evenly distributed on the current collector X2, and then dry to obtain current collector X3, and wind X3; The length ...

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Abstract

The invention relates to a folding graphene current collector and a preparation method thereof, and a lithium ion battery. The folding graphene current collector improves the resistance of a pole piece, reduces the internal resistance of the battery, increases the contact area ratio of the current collector to an active substance, increases the specific energy density of the battery and reduces the cost of the battery. According to the invention, the folding graphene current collector is novel current collector integrating an interlaced current collector with a conventional coating current collector; a first layer of an active substance on coats a light foil current collector, then interlaced current collector is folded and embedded into the active substance, and then coating of another layer of the active substance is conducted; and meanwhile, conducting modification treatment is conducted on the surface of the interlaced current collector; the contact area and binding force of the active substance and the current collector are increased and the resistance of the pole piece is improved from the above two aspects, so the internal resistance of the battery is greatly reduced; and meanwhile, the usage amounts of foil, a conductive agent and a binder are reduced, the specific energy density of the battery is improved, and battery cost is reduced.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to a current collector and a lithium-ion battery, in particular to a method for improving the resistance of pole pieces, reducing the internal resistance of the battery, increasing the contact area ratio between the current collector and active materials, increasing the specific energy density of the battery, and reducing the internal resistance of the battery. Folded graphene current collector and preparation method of battery cost and lithium ion battery. Background technique [0002] With the rapid development of human society, a large number of natural resources are developed and used, so problems such as resource shortage and environmental pollution will inevitably occur. In order to deal with this problem and alleviate energy shortage and environmental pollution, the new energy industry has been rapidly developed develop. Lithium-ion batteries have the advantages of high en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/74H01M10/0525
CPCH01M4/663H01M4/667H01M4/747H01M10/0525Y02E60/10
Inventor 黄汉川陈冬陈建王羽平相佳媛吴贤章
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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