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Ultralight lithium ion battery current collector and preparation method thereof

A technology of lithium-ion batteries and current collectors, which is applied in the directions of battery electrodes, electrode carriers/current collectors, circuits, etc., can solve problems such as difficult industrial application and difficulties, and achieve energy density improvement, weight reduction and space occupation, and improvement The effect of safety performance

Inactive Publication Date: 2018-07-27
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of a PET layer in the middle of the current collector, there will be great difficulties when it is welded to the external terminal, making it difficult to carry out industrial applications.

Method used

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  • Ultralight lithium ion battery current collector and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: as figure 1 As shown, a current collector for an ultra-light lithium ion battery includes a PET layer 1, U-shaped metal sheets 3 are clamped at both ends of the PET layer 1, and the PET layer 1 between the metal sheets 3 at both ends The upper metal layer 2.1 and the lower metal layer 2.2 are plated on the sides of both sides.

[0027] In a further solution, the thickness of the PET layer 1 is 4-10 μm.

[0028] In a further solution, the metal layer and the metal sheet 3 are made of the same material, which are copper, aluminum or nickel.

[0029] In a further solution, the thickness of the upper metal layer 2.1 or the lower metal layer 2.2 is 0.5-2 μm.

[0030] In a further solution, the thickness of the metal flake is 4.5-15 μm.

[0031] In a further solution, the metal sheet 3 is 0.5-4 cm beyond the end of the PET layer 1 .

Embodiment 2

[0033] A preparation method for an ultra-light lithium ion battery current collector, comprising the following steps:

[0034] (1) Coating a layer of adhesive layer on both sides of the end of the PET layer;

[0035] (2) Fold the metal sheet in half into a U-shaped structure, bond the two ends of the metal sheet to the adhesive layers on both sides of the PET layer, and combine the PET layer and the metal sheet by thermal compounding;

[0036] (3) Coating a metal layer on both sides of the PET layer located between the metal sheets at both ends.

[0037] When plating the metal layer, the metal layer will also be plated at the connection between the metal sheet and the PET layer, so that there is an overlapping area between the metal layer and the metal sheet, and the width of the overlapping area is 0.5~2cm.

[0038] In a further scheme, the binder is polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trifluoroethylene, polymethyl methacrylate, polybut...

Embodiment 3

[0041] A preparation method for an ultra-light lithium ion battery current collector, comprising the following steps:

[0042] (1) Coating a layer of cyanoethyl pullulan on both sides of the end of the PET layer;

[0043] (2) Fold the copper sheet into a U-shaped structure, bond the two ends of the copper sheet to the cyanoethyl branched chain lake on both sides of the PET layer, and use thermal compounding to composite the PET layer and the copper sheet together ;

[0044] (3) Using a high-power electron beam process, a copper layer is vacuum evaporated on both sides of the PET layer located between the copper sheets at both ends.

[0045] When the copper layer is plated, a copper layer is also plated at the connection between the copper sheet and the PET layer, so that there is an overlapping area between the copper layer and the copper sheet, and the width of the overlapping area is 0.5~2cm.

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Abstract

The invention discloses an ultralight lithium ion battery current collector, comprising a PET layer, wherein two ends of the PET layer are respectively connected with a U-shaped sheet metal, and the side surfaces of two sides, located between the sheet metals at the both ends, of the PET layer are plated with an upper metal layer and a lower metal layer. The lithium ion battery current collector of the invention adopts the PET layer as a matrix layer, and the sheet metals at the both ends are of U-shaped structure, the weight and occupied space of the current collector are greatly reduced, soenergy density in increased; moreover, since two side surface of the polymer matrix layer are plated with the metal layers, so burrs are not generated during processing and cutting, and the safety performance of a battery is improved; meanwhile, the current collector of the invention has more excellent processability compared with conventionally industrialized current collectors.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to an ultra-light lithium-ion battery current collector and a preparation method thereof. Background technique [0002] Due to its high voltage, long life, and high specific energy, lithium-ion secondary batteries have been widely used with the rapid development of consumer electronics such as mobile phones, notebook computers, and digital cameras since their commercialization at the end of the last century. Coupled with the increasing energy and environmental problems in recent years, lithium-ion batteries have begun to be widely used as power sources in automobiles. At the same time, higher requirements have been put forward for lithium-ion batteries. There are two core requirements: safety and energy density. [0003] Traditionally, the pursuit of energy density and safety are often two contradictory directions. The higher the energy density, the lower the safety of the ba...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/70
CPCH01M4/66H01M4/661H01M4/70Y02E60/10
Inventor 许涛王晨旭
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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