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Multifunctional composite current collector and preparation method thereof

A current collector and multi-functional technology, applied in the field of lithium-ion batteries, can solve the problems of limited improvement of battery safety, deterioration of battery rate performance, and impact on the conductivity of current collectors, so as to achieve timely electron transmission and isolate electron transmission , cost reduction effect

Pending Publication Date: 2021-11-26
浙江柔震科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 110600745 A discloses a copper-plated composite current collector based on polyimide film, which exhibits good cycle performance and rate performance, and improves the energy density of the battery. Limited improvement in battery safety
However, the insulating properties of the polymer in PPTC lead to an increase in the resistance between the upper and lower conductive layers, which affects the overall conductivity of the current collector and ultimately deteriorates the rate performance of the battery.

Method used

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  • Multifunctional composite current collector and preparation method thereof
  • Multifunctional composite current collector and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the novel multifunctional current collector and lithium-ion battery provided in Embodiment 1 of the present invention comprises the following steps:

[0027] (1) Firstly, plasma cleaning is performed on the surface of the commercialized PET polymer film to remove impurities on the surface.

[0028] (2) An alumina bonding layer with a thickness of 50 nm was prepared on the upper and lower surfaces of the cleaned film by vapor deposition.

[0029] (3) Place the thin film evaporated with the adhesive enhancing layer on the evaporated film substrate to prepare a metal aluminum layer with a thickness of about 800 nm.

[0030] (4) A temperature responsive layer with a thickness of 500 nm was prepared on the surface of the current collector on which the metal layer was evaporated. Among them, the response layer is composed of 10% conductive carbon black and 90% low-density polyethylene. The desired multifunctional composite current collector can be ...

Embodiment 2

[0033] The preparation method of the novel multifunctional current collector provided in Example 2 of the present invention comprises the following steps:

[0034] (1) Firstly, plasma cleaning is performed on the surface of the commercialized PET polymer film to remove impurities on the surface.

[0035] (2) An alumina bonding layer with a thickness of 50 nm was prepared on the upper and lower surfaces of the cleaned film by vapor deposition.

[0036] (3) Place the thin film evaporated with the adhesive enhancing layer on the evaporated film substrate to prepare a metal aluminum layer with a thickness of about 800 nm.

[0037] (4) A temperature responsive layer with a thickness of 500 nm was prepared on the surface of the current collector on which the metal layer was evaporated. Among them, the response layer is composed of 20% conductive carbon black and 80% low-density polyethylene. The desired multifunctional composite current collector can be obtained.

[0038] (5) The...

Embodiment 3

[0040] The preparation method of the novel multifunctional current collector provided in Example 3 of the present invention comprises the following steps:

[0041] (1) Firstly, plasma cleaning is performed on the surface of the commercialized PET polymer film to remove impurities on the surface.

[0042] (2) An alumina bonding layer with a thickness of 50 nm was prepared on the upper and lower surfaces of the cleaned film by vapor deposition.

[0043] (3) Place the thin film evaporated with the adhesive enhancing layer on the evaporated film substrate to prepare a metal aluminum layer with a thickness of about 800 nm.

[0044] (4) A temperature responsive layer with a thickness of 500 nm was prepared on the surface of the current collector on which the metal layer was evaporated. Among them, the response layer is composed of 30% conductive carbon black and 70% low-density polyethylene. The desired multifunctional composite current collector can be obtained.

[0045] (5) The...

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Abstract

The invention provides a multifunctional composite current collector, the multifunctional composite current collector comprises a base material layer, bonding layers, a metal layer and a temperature response layer, the bonding layers are respectively arranged on two opposite surfaces of the base material layer, the metal layer is arranged on the surface, far away from the base material layer, of the bonding layer, the temperature response layer is arranged on the surface, away from the base material layer, of the metal layer, and the surface of the current collector is coated with the temperature response layer, so that sensitive response can be achieved when an active substance releases heat, and electron transmission is isolated in time.

Description

technical field [0001] The invention belongs to the technical field related to lithium ion batteries, and more specifically relates to a plastic metallized multifunctional composite current collector and a preparation method thereof. Background technique [0002] As an energy supply device, lithium-ion batteries have been widely used in mobile phones, computers, electric vehicles and other fields. With the continuous development of science and technology, the market has put forward higher requirements for the energy density and safety performance of lithium batteries. At present, commercial lithium-ion batteries mainly use copper foil and aluminum foil as current collectors for electron transmission, and both copper foil and aluminum foil have very high density, and at the same time, they do not contribute to the capacity of the battery during the working process of the battery. Therefore, it is considered the "dead mass" inside the battery. In order to reduce the impact o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/62H01M10/0525H01M10/42
CPCH01M4/667H01M4/624H01M50/581H01M10/0525H01M10/4235Y02E60/10
Inventor 黄云辉伽龙刘志康焦鑫鹏汪茹严超
Owner 浙江柔震科技有限公司
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