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Composite current collector, preparation method and application thereof

A technology of current collectors and conductive polymers, applied in the field of its preparation and composite current collectors, can solve the problems of poor electrochemical performance of current collectors, and achieve the effects of improving cycle performance, high electrical conductivity, and increasing energy density

Inactive Publication Date: 2021-01-08
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the current collector prepared by the above method has poor electrochemical performance

Method used

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  • Composite current collector, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0051] A composite positive current collector, comprising a conductive polymer fiber film and metal aluminum layers arranged on both sides of the conductive polymer fiber film, the conductive nanomaterial graphene is distributed in the conductive polymer fiber film; the composite positive electrode The preparation method of current collector:

[0052] (1) Preparation of conductive polymer fiber membrane: 25.2g poly(3,4-ethylenedioxythiophene) / polystyrenesulfonic acid (PEDOT / PSS) colloid solution, 2.1g ethylene glycol (EG), 0.3 G surfactant (Capstone FS-30), 2.1g polyethylene glycol and 0.3g graphene were mixed, ultrasonically dispersed for 30min, then placed on a magnetic stirrer and stirred for 24h, and mixed thoroughly to obtain a spinning solution;

[0053] The spinning solution was electrospun to prepare a conductive polymer fiber film. The electrospinning conditions were: needle diameter 0.51mm, temperature control 10°C, humidity control 40%RH, spinning voltage 15kV, spee...

Embodiment 2

[0057] A composite positive current collector, comprising a conductive polymer fiber film and metal aluminum layers arranged on both sides of the conductive polymer fiber film, the conductive nanomaterial graphene is distributed in the conductive polymer fiber film; the composite positive electrode The preparation method of current collector:

[0058] (1) Preparation of conductive polymer fiber membrane: fully dissolve 5.9g polyaniline (PANI) in 23.8g N-methylpyrrolidone (NMP), add 0.3g graphene for ultrasonic dispersion for 30min, and then stir on a magnetic stirrer 24h, make it fully mixed to obtain spinning solution;

[0059] The spinning solution was electrospun to prepare a conductive polymer fiber film. The electrospinning conditions were: needle diameter 0.51mm, temperature control 10°C, humidity control 40%RH, spinning voltage 15kV, speed control 0.50mL / h, the obtained polymer film was vacuum-dried at 120° C. for 2 h after spinning to obtain a conductive polymer fibe...

Embodiment 3

[0062] A composite positive current collector, comprising a conductive polymer fiber film and metal aluminum layers arranged on both sides of the conductive polymer fiber film, the conductive nanomaterial graphene is distributed in the conductive polymer fiber film; the composite positive electrode The preparation method of current collector:

[0063] (1) Preparation of conductive polymer fiber membrane: 5.9g polypyrrole (PPy) was fully dissolved in 23.8g N,N-dimethylformamide (DMF), 0.3g graphene was added for ultrasonic dispersion for 30min, and then placed under magnetic force Stir on the stirrer for 24 hours to make it fully mixed to obtain a spinning solution;

[0064] The spinning solution was electrospun to prepare a conductive polymer fiber film. The electrospinning conditions were: needle diameter 0.51mm, temperature control 10°C, humidity control 40%RH, spinning voltage 15kV, speed control 0.50mL / h, the obtained polymer film was vacuum-dried at 120° C. for 2 h afte...

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Abstract

The invention relates to a composite current collector, a preparation method and application thereof. The composite current collector comprises a conductive polymer fiber membrane and metal layers arranged on the two sides of the conductive polymer fiber membrane, wherein a conductive nano material is distributed in the conductive polymer fiber membrane. According to the invention, the conductivepolymer fiber membrane serving as the middle layer is a conductive polymer membrane and has good conductivity and high ductility, and when a lithium ion battery is subjected to external physical impact, especially impact of sharp objects or heavy objects, the metal layers on the two sides of the composite current collector can be broken, the middle polymer layer can wrap the fracture surfaces of the metal layers on the two sides from the fracture position by means of the ductility of the middle polymer layer, and the fracture surfaces are prevented from piercing the diaphragm and making contact with other places to cause short circuit, so that the safety problems that after the lithium ion battery is impacted by external physical impact, internal short circuit is likely to be caused, and thermal runaway is caused are solved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a composite current collector, its preparation method and application. Background technique [0002] Lithium-ion batteries have been widely used in consumer electronics, electric vehicles and other fields, and have emerged in the field of large-scale energy storage. The market has put forward higher requirements for the energy density, power density, and life of lithium-ion batteries. [0003] As an important part of lithium-ion batteries, the current collector plays the role of attaching positive or negative active materials and transporting electrons in the battery. The existing positive and negative current collectors are generally made of metal materials, but due to the high density and heavy weight of the metal current collector, the weight of the general current collector accounts for 20% to 25% of the entire battery, which reduces the weight ratio of the ele...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/661H01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 黎中利冀亚娟袁中直刘建华刘金成
Owner EVE ENERGY CO LTD
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