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Composite current collector and preparation method and application thereof

A current collector and conductive agent technology, which is applied in the field of composite current collectors and its preparation, can solve the problems of reducing the energy density of batteries, low platform voltage, and low mass specific capacity of lithium iron phosphate, so as to reduce the risk of pulverization and falling off, The effect of reducing the internal resistance of the battery and inhibiting the chain reaction caused by thermal runaway

Pending Publication Date: 2021-08-27
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above schemes all use lithium iron phosphate to prepare composite positive pole pieces, but due to the low mass specific capacity (150-160mAh / g) and low platform voltage (3.4V) of lithium iron phosphate, the energy density of the battery cell will be significantly reduced

Method used

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  • Composite current collector and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0050] This embodiment provides a composite current collector, and the preparation method of the composite current collector is as follows:

[0051] (1) Take an aluminum foil with a thickness of 12 μm, ultrasonically clean the aluminum foil with acetone, ethanol, and deionized water for 20 minutes to remove surface oil stains, and then soak it in acetic acid solution with a concentration of 0.1mol / L for 3 minutes to remove surface oxides, and then vacuum dry. isolated from oxygen;

[0052] (2) Get graphene, join in nitrogen methyl pyrrolidone, ultrasonic dispersion 0.5h, obtain the graphene suspension of 0.5wt%; Disperse polyvinylidene fluoride in nitrogen methyl pyrrolidone, after fully dissolving, obtain solid A glue with a content of 2% and a viscosity of 1000mPa·s; the glue is added to the graphene suspension at a mass ratio of 1:1 and stirred and mixed. The mixing process uses a planetary mixer and the stirring time is 2h to obtain a conductive paste. According to the ma...

Embodiment 2

[0055] This embodiment provides a composite current collector, and the preparation method of the composite current collector is as follows:

[0056] (1) Take an aluminum foil with a thickness of 12 μm, ultrasonically clean the aluminum foil with acetone, ethanol, and deionized water for 20 minutes to remove surface oil stains, and then soak it in acetic acid solution with a concentration of 0.1mol / L for 3 minutes to remove surface oxides, and then vacuum dry. isolated from oxygen;

[0057] (2) Take carbon nanotubes, add them to water, and ultrasonically disperse them for 0.5h to obtain a suspension of 0.5wt% carbon nanotubes; disperse polyacrylate into water, and after fully dissolving, obtain a glue with a solid content of 2%. ; The glue is added to the carbon nanotube suspension according to the mass ratio of 1:1 and stirred and mixed. The mixing process uses a planetary mixer, and the stirring time is 2h to obtain a conductive paste. According to lithium iron manganese phos...

Embodiment 3

[0060] The only difference between this embodiment and embodiment 1 is that step (2) uses lithium manganese iron phosphate material as LiMn 0.3 Fe 0.7 PO 4 , other conditions and parameters are exactly the same as in Example 1.

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Abstract

The invention provides a composite current collector and a preparation method and application thereof, and the preparation method comprises the following steps of (1) mixing a conductive agent, a binder and a solvent to obtain conductive slurry, and adding lithium ferric manganese phosphate to obtain coating slurry; and (2) intaglio-coating the coating slurry obtained in the step (1) on the surface of an aluminum foil subjected to impurity removal treatment, and drying to obtain the composite current collector. According to the composite current collector prepared by the method disclosed by the invention, the higher energy density of the battery is ensured, and meanwhile, the composite current collector is stable in structure;the lithium manganese iron phosphate material with low heat release is isolated at one side of an active material, so that the chain reaction caused by thermal runaway of the active material in the abuse processes, such as needling, etc., of the battery can be inhibited, and the purpose of improving the safety of the battery is achieved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a composite current collector and a preparation method and application thereof. Background technique [0002] Due to the advantages of high energy density, long cycle life, no memory effect and environmental friendliness, lithium-ion batteries are widely used in portable electronic products, energy storage devices and new energy vehicles. With the advent of the 5G era of mobile phones and the development requirements of new energy vehicles with high mileage, there is also a higher demand for the energy density of lithium-ion batteries. However, the higher the energy density of lithium-ion batteries, the worse their safety. Power batteries have caused many spontaneous combustion and explosion accidents in electric vehicles and hybrid vehicles due to safety issues, thus severely restricting the further development of lithium-ion batteries in the field of new energy. develop. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/1397H01M4/136H01M4/58H01M4/62H01M10/0525
CPCH01M4/667H01M4/661H01M4/136H01M4/1397H01M4/5825H01M4/628H01M4/624H01M10/0525H01M2004/028Y02E60/10
Inventor 黎中利冀亚娟邓孝龙
Owner EVE ENERGY CO LTD