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Current collector for lithium ion battery and preparation method of current collector

A technology for lithium ion batteries and current collectors, applied in the field of lithium ion batteries, can solve the problems of inconsistent bonding strength of active material coatings on both sides, asymmetric structures on both sides of current collectors, and asymmetric contact resistance of active material coatings, etc. Stable quality, cycle performance, and the effect of improving energy density

Inactive Publication Date: 2016-07-13
SHENZHEN LIWEI LI ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a current collector for lithium-ion batteries and a preparation method thereof, aiming at solving the problem of asymmetrical contact resistance of the active material coating on both sides of the current collector due to the asymmetric structure on both sides of the existing current collector. , and the problem of inconsistency in the bonding strength of the active material coating on both sides

Method used

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  • Current collector for lithium ion battery and preparation method of current collector

Examples

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Comparison scheme
Effect test

Embodiment 1

[0044] Clean the surface of the microporous non-woven fabric substrate with a thickness of 8 μm to remove oil stains with acetone or alcohol, preheat the cleaned substrate at 70°C, install the processed substrate on the fixture, debug the program, and prepare for coating; The high-purity aluminum powder with a D50 of 23nm is dried at 100°C for 1 hour before coating, and put into the powder feeder; set the coating process parameters, voltage: 35V; current: 500A; argon gas flow rate: 30L / min; Powder rate: 2g / min; Coating distance: 150mm; Coating rate: 50cm / min; Execute the program for coating; The thickness of one side of the metal coating is 2 μm, and the total thickness of the metal coating is 4 μm. The mass density of the double-sided symmetrically coated aluminum collector prepared by the above process is 1.4g / cm 3 .

[0045] Clean the surface of the microporous polymer double-layer PP / PE substrate with a thickness of 12 μm with acetone or alcohol to remove oil stains, preh...

Embodiment 2

[0048] Clean the surface of the microporous polymer double-layer PP / PP substrate with a thickness of 9 μm with acetone or alcohol to remove oil stains, preheat the cleaned substrate at 60°C, install the processed substrate on the fixture, and debug the program , ready for coating; dry the high-purity aluminum powder with a D50 of 18nm at 100°C for 1 hour before coating, and put it into the powder feeder; set the coating process parameters, voltage: 35V; current: 500A; argon gas flow : 30L / min; Powder feeding rate: 2g / min; Coating distance: 150mm; Coating rate: 50cm / min; Execute the program for coating; The thickness of one side of the coating is 1 μm, and the total thickness of the coating is 2 μm. The mass density of the double-sided symmetrically coated aluminum collector prepared by the above process is 0.8g / cm 3 .

[0049]Clean the surface of the microporous non-woven fabric substrate with a thickness of 16 μm to remove oil stains with acetone or alcohol, preheat the clea...

Embodiment 3

[0052] Clean the surface of the microporous carbon fiber paper substrate with a thickness of 20 μm with acetone or alcohol to remove oil stains, preheat the cleaned substrate at 80°C, install the processed substrate on the fixture, debug the program, and prepare for coating; D50 The 18nm high-purity aluminum powder is dried at 100°C for 1 hour before coating, and put into the powder feeder; set the coating process parameters, voltage: 40V; current: 550A; argon gas flow rate: 35L / min; powder feed Rate: 3g / min; Coating distance: 80mm; Coating rate: 80cm / min; Execute the program to coat; The thickness of one side of the coating is 1.5 μm, and the total thickness of the coating is 3 μm. The mass density of the double-sided symmetrically coated aluminum collector prepared by the above process is 1.3g / cm 3 .

[0053] Clean the surface of the microporous carbon fiber paper substrate with a thickness of 20 μm with acetone or alcohol to remove oil stains, preheat the cleaned substrate...

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Abstract

The invention discloses a current collector for a lithium ion battery and a preparation method of the current collector.The current collector is composed of metal coatings and a microporous film layer.The microporous film layer is coated with the metal coatings in a double-face symmetry mode.The mass density of the current collector is only 1 / 3 to 1 / 2 that of conventional aluminum foil and copper foil metal, the mass of the lithium ion battery is obviously reduced, the energy density of the battery is improved, and the problem of short runtime of a power battery is solved.The surface roughness of the current collector is increased through the coatings, and the current collector can fully make contact with active matter; the capacity of the active matter is evenly released through the double-face symmetry coating structure, electrochemical polarization of the battery in the charge and discharge process is relieved, and the cycle performance of the battery is stable.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a current collector for lithium ion batteries and a preparation method thereof. Background technique [0002] With the continuous advancement of lithium-ion battery technology, the application prospects of lithium-ion in the field of high-power and high-energy power batteries are even more impressive. Higher requirements are placed on the energy density and safety of lithium-ion batteries for power. [0003] The improvement of lithium-ion batteries in the prior art is as follows: seeking high-energy positive and negative active materials, improving the electrolyte and diaphragm, improving the manufacturing process, and improving the current collector to improve battery performance. The modification of the current collector in the prior art is manifested as The surface of the current collector is coated with conductive carbon black to reduce the internal resistance of the bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/661H01M4/667H01M10/0525Y02E60/10
Inventor 刘立君宋翠环
Owner SHENZHEN LIWEI LI ENERGY TECH CO LTD
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