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Composite current collector, preparation method, electrode prepared from composite current collector and battery prepared from composite current collector

A current collector and electrode technology, applied in the direction of electrode carrier/current collector, final product manufacturing, sustainable manufacturing/processing, etc., to achieve the effects of improving thermal safety performance and acupuncture pass rate, reducing internal resistance, and low overall thickness

Pending Publication Date: 2022-08-05
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the problem that the existing PTC layer is easily dissolved by the organic solvent of the positive electrode active material, the present invention provides a composite current collector, which coats the second conductive metal layer on the outer layer of the polymer PTC layer to protect the polymer from being dissolved by the solvent. Corrosion, improving the stability and safety of composite current collectors

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  • Composite current collector, preparation method, electrode prepared from composite current collector and battery prepared from composite current collector
  • Composite current collector, preparation method, electrode prepared from composite current collector and battery prepared from composite current collector
  • Composite current collector, preparation method, electrode prepared from composite current collector and battery prepared from composite current collector

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preparation example Construction

[0043] The application also discloses a preparation method of a composite current collector, comprising the following steps:

[0044] S1, preparing a first conductive metal layer 2 on both sides of the base layer 1;

[0045] S2, preparing a polymer PTC layer 3 on the outside of the first conductive metal layer 2;

[0046] S3 , preparing a second conductive metal layer 4 on the outside of the polymer PTC layer 3 .

[0047] Among them, the first conductive metal layer 2 and the second conductive metal layer 4 are prepared by one or more methods of vacuum evaporation coating, vacuum sputtering coating, vacuum electron beam coating, and electroplating; the polymer PTC layer 3 is made by coating or by spraying.

Embodiment 1

[0053] S1. Prepare a first conductive metal layer 2 on both sides of the base layer 1: select a 4.5 μm thick PET (polyethylene terephthalate) film as the base layer 1, and use a 4.5 μm thick base layer 1 on both sides of the base layer 1 By means of vacuum evaporation coating, a first metal conductive layer 2 with a thickness of 1 μm is formed, and the material of the first metal conductive layer 2 is aluminum;

[0054] S2. Prepare a polymer PTC layer 3 on the outside of the first conductive metal layer 2: apply the slurry of polyethylene + conductive carbon black particles on the outside of the first conductive metal layer 2, and dry to obtain a high Molecular PTC layer 3, the volume fraction of the conductive carbon black particles accounts for 30% of the polymer PTC layer 3;

[0055] S3. Prepare a second conductive metal layer 4 on the outside of the polymer PTC layer 3: obtain a second conductive metal layer 4 with a thickness of 20 nm on the outside of the polymer PTC lay...

Embodiment 2

[0057] S1, prepare the first conductive metal layer 2 on both sides of the base layer 1: select a 6 μm thick PET (polyethylene terephthalate) film as the base layer 1, and pass a vacuum on both sides of the 6 μm thick base layer 1 In the method of electron beam coating, a first metal conductive layer 2 with a thickness of 1.2 μm is formed, and the material of the first metal conductive layer 2 is aluminum;

[0058] S2. Prepare a polymer PTC layer 3 on the outside of the first conductive metal layer 2: spray the polypropylene+carbon fiber slurry on the outside of the first conductive metal layer 2, and dry to obtain a polymer PTC layer 3 with a thickness of 2.2 μm , the volume fraction of the carbon fiber accounts for 20% of the polymer PTC layer 3;

[0059] S3. Prepare a second conductive metal layer 4 on the outside of the polymer PTC layer 3: obtain a second conductive metal layer 4 with a thickness of 50 nm on the outside of the polymer PTC layer 3 by vacuum evaporation coa...

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Abstract

The invention discloses a composite current collector, a preparation method and an electrode and a battery prepared from the composite current collector, and belongs to the field of lithium ion batteries. The composite current collector comprises a substrate layer, first conductive metal layers, a polymer PTC layer and a second conductive metal layer, the first conductive metal layers are arranged on the upper side and the lower side of the substrate layer, the polymer PTC layer is arranged on the outer side of the first conductive metal layers, and the second conductive metal layer is arranged on the outer side of the polymer PTC layer. When the internal temperature of the battery is increased due to short circuit and the like, the internal resistance of the composite current collector is sharply increased, and the short-circuit current is reduced, so that the internal short-circuit heat of the battery can be reduced, and the thermal safety performance of the battery is improved; and the needling passing rate and the thermal safety performance of the battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more particularly, relates to a composite current collector, a preparation method and electrodes and batteries prepared therefrom. Background technique [0002] With the continuous development of the lithium electronic battery industry, people are increasingly pursuing the high energy density and lightweight of the battery. At the same time, as the energy density of the lithium ion battery is getting higher and higher, the safety is the limitation of the application of the high energy density lithium ion battery. the biggest bottleneck. The safety problems of lithium-ion batteries are mainly caused by the thermal runaway of the batteries. Due to the abnormal heat-generating reaction inside the battery, the internal temperature of the battery continues to rise, which in turn triggers more heat-generating side reactions, causing the battery to catch fire or even explode, thus seriously thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66
CPCH01M4/667H01M4/661Y02P70/50
Inventor 陈启武许涛王磊张江伟王义飞
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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