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Ultra-light conductive current collector

A technology of current collectors and conductive agents, applied in the field of ultra-light conductive current collectors, can solve the problems of not meeting the requirements of lightweight batteries, increasing the thickness of current collectors, and increasing the quality of current collectors.

Inactive Publication Date: 2020-07-07
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such methods undoubtedly increase the thickness of the current collector, which cannot meet the modern needs of lightweight batteries. The base material of these two patented current collectors is a metal foil, which improves safety performance by combining a PTC composite material layer, but at the same time Brings the disadvantage of increasing the mass of the current collector

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044](1) Preparation of polyethylene PTC plastics: setting the Curie temperature point to be 85°C, setting the model ingredients of low-density polyethylene and aluminum metal powder according to the Curie temperature point, wherein the low-density polyethylene mass accounts for 70% of the percentage, The mass of aluminum metal powder accounts for 30%, and the content of pure aluminum is not less than 98%. First add aluminum metal powder into the internal mixer with the temperature set at 185°C, set the speed at 5 rpm, then slowly add polyethylene particles for full mixing, and increase the speed of the internal mixer to 30 after the polyethylene feeding is completed. revolutions per minute, banburying time 40 minutes, to obtain polyethylene PTC plastics.

[0045] (2) Preparation of polyethylene PTC plastic film: the polyethylene PTC plastic obtained above is rolled by an open mill to obtain a polymer PTC plastic film coil with a thickness of 40 μm; Vinyl PTC plastic film. ...

Embodiment 2

[0050] (1) Preparation of polypropylene PTC plastic: set the Curie temperature point to 100°C, set the model ingredients of polypropylene and aluminum metal powder according to the Curie temperature point, wherein the mass of polypropylene accounts for 80%, and the mass of aluminum metal powder The percentage is 20%, and the pure aluminum content is not less than 95%. In the internal mixer whose temperature is set at 200°C, inert gas is introduced first, then polypropylene particles are added, and the speed is set at 15 rpm. After maintaining this state for 30 minutes, aluminum metal powder is slowly added, and the speed is increased to 60. revolutions per minute, banburying time 50 minutes, to obtain polypropylene PTC plastics.

[0051] (2) Preparation of polypropylene PTC plastic film: rolling the above-mentioned polypropylene PTC plastic through an open mill to obtain a polymer PTC plastic film coil with a thickness of 60 μm; Acrylic PTC plastic film.

[0052] (3) Cleanin...

Embodiment 3

[0056] (1) Preparation of polyimide PTC plastic: set the Curie temperature point to 400°C, and set the model ingredients of polyimide and copper metal powder according to the Curie temperature point, wherein the mass of polyimide accounts for 80% %, the mass of copper metal powder accounts for 20%, and the pure copper content is not less than 98%. First pass argon gas into the internal mixer with the temperature set at 600°C, then add polyimide particles, and set the speed at 20 rpm. After maintaining this state for 60 minutes, slowly add copper metal powder, and increase the speed to 60 rpm, banburying time 60 minutes, to obtain polyimide PTC plastics.

[0057] (2) Prepare polyimide PTC plastic film: the polyimide PTC plastic of above-mentioned gain is rolled by open mill, obtains the polymer PTC plastic film coil material that thickness is 75 μ m; A polyimide PTC plastic film of 12 μm was obtained.

[0058] (3) Cleaning polyimide PTC plastic film: the polyimide PTC plastic...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to an ultra-light current collector. The ultra-light conductive current collector is characterized in that the current collector is of layered porous structure and formed by laminating a supporting layer and a conductive enhancement layer, the supporting layer is a polymer PTC plastic film, the conductive enhancement layer is a graphene film, and after the graphene film is deposited on the polymer PTC plastic film, laser drilling is carried out to form the graphene / polymer PTC plastic film current collector with the layered porous structure. According to the current collector provided by the invention, the mass of the battery current collector can be effectively reduced, and the thermal runawayprobability of the battery in case of short circuit or over-high temperature can be reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular, it is an ultra-light conductive current collector. Background technique [0002] In the traditional lithium-ion battery manufacturing industry, the current collector, as an important part of the battery cell, plays the role of loading positive and negative active materials. Copper foil is mostly used for the negative electrode, and aluminum foil is used for the positive electrode as the current collector. The total mass of the positive and negative electrode collectors accounts for about 14%-18% of the total mass of the single battery. With the official release of the country's strategic plan for high energy density of batteries, the industry's battle to increase energy density has officially begun. Weight reduction of current collectors is an effective solution to increase the energy density of single batteries. In the existing foil market, the thickness of copper f...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/70
CPCH01M4/66H01M4/70Y02E60/10
Inventor 王兴勤高志伟刘娜刘建红吴宁宁
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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