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Flexible current collector, electrode containing flexible current collector, and battery

A flexible current collector and electrode technology, applied in the direction of electrode carrier/collector, battery electrode, non-aqueous electrolyte battery electrode, etc., can solve the problems affecting battery performance efficiency, poor machining performance, battery leakage current, etc., and achieve good electrical conductivity Performance, good machinability, and the effect of increasing the load capacity

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal foil has good electrical conductivity, but the machining performance is poor at the above-mentioned thickness. Leakage current not only affects the performance efficiency of the entire battery, but may even cause serious safety problems

Method used

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  • Flexible current collector, electrode containing flexible current collector, and battery
  • Flexible current collector, electrode containing flexible current collector, and battery
  • Flexible current collector, electrode containing flexible current collector, and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The total thickness of the prepared flexible current collector is 35 μm, the textile substrate has 4 layers, the material is polyester, the diameter of the polyester fiber is 7-10 μm, the material of the metal conductive plating layer is copper-nickel, and the total thickness is 2 μm.

[0054] It has been determined that the mass per unit area of ​​the flexible current collector is 37g / m 2 , the surface resistance is ~35mΩ;

[0055] When baked at 120°C for 5 hours, the thermal shrinkage rate is less than 1%, and the resistance change is less than 2%; when the bending radius is 1em, it is bent 180° more than 20,000 times, and the resistance change is less than 2%.

Embodiment 2

[0057] The total thickness of the prepared flexible current collector is 45 μm, and the textile substrate has 5 layers, the material is polyester, the diameter of the polyester fiber is 7-10 μm, the material of the metal conductive plating layer is copper, and the total thickness is 2 μm.

[0058] It has been determined that the mass per unit area of ​​the flexible current collector is 50g / m 2 , the surface resistance is ~25mΩ;

[0059] When baked at 120°C for 5 hours, the heat shrinkage rate is less than 1%, and the resistance change is less than 2%; when the bending radius is 1cm, it is bent 180° more than 20,000 times, and the resistance change is less than 2%.

Embodiment 3

[0061] The total thickness of the prepared flexible current collector is 35 μm. The textile substrate has 4 layers, the material is polyester, the diameter of the polyester fiber is 7-10 μm, the material of the metal conductive coating is aluminum, and the total thickness is 3 μm.

[0062] It has been determined that the mass per unit area of ​​the flexible current collector is 23g / m 2 , the surface resistance is ~45mΩ;

[0063] When baked at 120°C for 5 hours, the heat shrinkage rate is less than 1%, and the resistance change is less than 2%; when the bending radius is 1cm, it is bent 180° more than 20,000 times, and the resistance change is less than 2%.

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Abstract

The invention discloses a flexible current collector, an electrode containing the flexible current collector, and a battery. The flexible current collector comprises a textile fabric base and a metal conductive coating; the fiber of the textile fabric is coated with the metal conductive coating; the thickness of the metal conductive coating is 200 nm to 5 microns. An electrode active material of the electrode containing the flexible current collector is loaded on the surface and / or in the hole of the flexible current collector. By adoption of the battery prepared from the electrode provided by the invention, the interface resistance of the battery can be effectively reduced, the electrode mass of unit area is reduced, and the mass energy density is improved; the flexible current collector provided by the invention has higher machining property relative to that of the traditional metal foil, so the production efficiency of the battery can be improved, and the production cost of the battery can be reduced; the current collector base is a macromolecular material and can be shrunk and fused at high temperature, so the safety performance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a flexible current collector, an electrode containing the flexible current collector and a battery. Background technique [0002] Due to its high energy density, good reliability and excellent environmental performance, lithium batteries have become one of the most important energy storage devices in the market and are widely used in portable electronic products such as digital cameras, mobile phones and notebook computers. With the recent rise and rapid development of electric vehicles, the energy density and stability of lithium-ion batteries have been further improved and improved. The current collector, as the connecting electrode and the component of the external circuit in the lithium battery, has a crucial influence on the performance of the battery. The function of the current collector is to collect the small currents of each part of the positive electrode or negative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/66
CPCH01M4/13H01M4/139H01M4/661Y02E60/10
Inventor 吴永志汪小知傅杰聂赞相徐天白沃华蕾
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