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Composite current collector and lithium ion battery

A lithium-ion battery and current collector technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problems of single structure, heavy weight, and high cost of current collectors, so as to improve mass energy density and reduce production cost, and the effect of improving the cycle life

Active Publication Date: 2021-05-04
蜻蜓实验室(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a new type of composite current collector and lithium ion battery to solve the problem of low mass energy density of the battery caused by the high cost, heavy weight and single structure of the current collector in the prior art, affecting the cycle life of the battery, and the current collector. The problem of structural instability

Method used

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  • Composite current collector and lithium ion battery
  • Composite current collector and lithium ion battery
  • Composite current collector and lithium ion battery

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Embodiment approach

[0051] As a preferred embodiment of the present invention, the non-metallic material is polyester (PET), polypropylene (PP), polyamide (PA), polyimide (PI), polyethylene (PE), polyethylene oxide ( PEO), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), polymethyl methacrylate (PMMA), polytetrafluoroethylene (PTFE) , polyvinyl alcohol (PVA), non-woven fabric, polyester, carbon fiber, carbon tube, graphene, etc., any one or more composites.

[0052] As a preferred embodiment of the present invention, several holes 20 are provided on the carrier layer 2, and the holes 20 make the carrier layer 2 have a porosity of 3%-95%. Its advantages are: setting holes on the carrier layer can not only further reduce the weight of the carrier layer and the composite current collector, but also improve the mass energy density of the battery, and the holes are easy to form a conductive structure to facilitate the flow of ions, thereby ensuring the com...

Embodiment 1

[0057] Such as figure 1 As shown, the composite current collector of the present invention includes two conductive layers 1 containing carbon materials, and a carrier layer 2 containing non-metallic materials. The carrier layer 2 provides a flowing carrier for the conductive layer 1 . The conductive layer 1 is connected to the carrier layer 2 , and the edges of the conductive layer 1 and the carrier layer 2 are spliced ​​and fixed through the splicing and fixing layer 3 . Specifically, two conductive layers 1 sandwich the carrier layer 2 , the two conductive layers 1 are respectively connected to the top surface and the bottom surface of the carrier layer 2 , and the two conductive layers 1 are vertically symmetrical with respect to the carrier layer 2 . The carrier layer 2 provides a carrier for the two conductive layers 1 . Holes 20 are provided on the carrier layer 2 to facilitate the conduction of ions between the two conductive layers 1 .

[0058] In the first embodimen...

Embodiment 2

[0062] Such as Figure 4 as shown, Figure 4 It is a schematic diagram of the structure of the composite current collector of Embodiment 2 of the present invention; the composite current collector of the present invention includes a conductive layer 1 of carbon-containing material, and a carrier layer 2 containing non-metallic material, and the carrier layer 2 provides flow for the conductive layer 1 carrier. The conductive layer 1 is connected to the carrier layer 2 , and the edges of the conductive layer 1 and the carrier layer 2 are spliced ​​and fixed through the splicing and fixing layer 3 .

[0063] The conductive layer 1 is a combination of several independent sub-conductive layers 10 . Several embedding holes are provided on the carrier layer 2, and several sub-conductive layers 10 are respectively inserted into the embedding holes. Several sub-conductive layers 10 are arranged parallel to each other and equidistant, and the top surfaces have the same height. The t...

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Abstract

The invention provides a composite current collector which comprises at least two composite layers and a splicing fixing layer, the two composite layers are respectively a conductive layer containing a carbon material and a carrier layer containing a non-metallic material with holes, the conductive layer is connected with the carrier layer, and the edges of the conductive layer and the carrier layer are spliced and fixed through the splicing fixing layer. The weight of the current collector is reduced, so that the mass energy density of a battery is improved, the cycle life of the battery is prolonged, the overall structural stability of the current collector is improved, the cost is low, the lithium ion battery comprises a shell and a battery cell, the battery cell is arranged in the shell, and the battery cell comprises a positive electrode, a negative electrode and an isolating membrane between the positive electrode and the negative electrode; the positive electrode and the negative electrode of the lithium battery comprise the composite current collectors, the positive electrode and the negative electrode of the lithium battery are made of the composite current collectors, the mass energy density of the lithium battery is improved, the cycle life of the lithium battery is prolonged, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of energy storage devices, in particular to a composite current collector and a lithium ion battery. Background technique [0002] Current collector, as the name implies, refers to the structure or parts that collect current. In lithium-ion batteries, it mainly refers to metal foil, such as copper foil and aluminum foil. The general term can also include polar ears. Its function is mainly to gather the current generated by the active material of the battery to form a larger current output, so the current collector should be in full contact with the active material. [0003] In the lithium battery manufacturing industry, current collectors need to be installed on the positive and negative electrodes of lithium-ion secondary batteries. Existing current collectors are generally made of aluminum foil or copper foil materials Current collectors can meet the manufacturing requirements of lithium-ion secondary batteries, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 王爱萍
Owner 蜻蜓实验室(深圳)有限公司
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