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Graphene-coated aluminium foil current collector and preparation method thereof

A technology of graphene and current collectors, which is applied in the field of high-performance graphene-coated aluminum foil current collectors and its preparation, can solve the problems of complex synthesis process, limited dispersion effect, and influence on material conductivity, and achieve simple and controllable preparation process, Improved rate performance and improved cycle life

Active Publication Date: 2017-05-31
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation process is simple, the synthesis process is complicated due to the need to add a large number of precursor reaction sources during the stirring process, but the dispersion effect is limited, and the use of high-power ultrasound will also cause heat to coalesce instantaneously and volatilize the solvent. Therefore, additional Cooling equipment, especially ultrasound, also causes excessive fragmentation of carbon materials, forming more defects and affecting the conductivity of the material
And it is used for a long time, the energy consumption is serious, the efficiency is low during industrial production, and it is difficult to adapt to industrial production
In particular, graphene has poor dispersion and is easy to agglomerate
The conductivity of the graphene coating cannot be fully utilized, which reduces the conductivity of the electrode; in addition, during the preparation process, due to the uneven dispersion of graphene, the graphene dispersion liquid settles, making it difficult to control the graphene-coated aluminum foil, which affects the coating. Effect

Method used

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  • Graphene-coated aluminium foil current collector and preparation method thereof

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preparation example Construction

[0027] Please refer to figure 1 , the embodiment of the present invention provides a method for preparing a graphene-coated aluminum foil current collector, comprising the following steps:

[0028] (1) Preparation of graphene dispersion: disperse graphene in solvent, then add a certain amount of dispersant, open Microfluidizer M-110L high-pressure micro-jet homogenizer, adjust pressure to be 400-10000 pounds per square inch PSI, in Disperse the graphene material on the basis of the emulsification of the dispersant to obtain a primary dispersion, and after standing still, take the upper dispersion;

[0029] (2) Preparation of graphene coating liquid: adding a weight percentage of 0.5-10% binder into the upper dispersion liquid for high-speed shear dispersion, and adjusting the viscosity between 300-1500 centipoise to prepare a uniform Composite conductive graphene coating solution;

[0030] (3) Preparation of graphene-coated aluminum foil: the aluminum foil is subjected to su...

Embodiment 1

[0036] Stir 5wt% graphene and 2wt% dispersant PVP into the solvent NMP, turn on the Microfluidizer M-110L high-pressure micro-jet homogenizer, adjust the pressure to 8000 pounds per square inch PSI, and disperse graphene on the basis of dispersant emulsification materials to obtain a primary dispersion. After standing still, take the upper layer dispersion liquid. Then add 2wt% binder PVDF high-speed shear dispersion to the dispersion, adjust the viscosity at 300-1500 centipoise to obtain a conductive graphene coating liquid; then, the aluminum foil is first roughened in sodium hydroxide or oxalic acid treated and dried. Coat the dispersed graphene coating solution on one or both sides of the pretreated aluminum foil material, and then dry it in a vacuum at 80-120°C for 6 hours to obtain a graphene-coated aluminum foil product. The coating is around 3 microns.

Embodiment 2

[0038] Stir 3wt% graphene and 5wt% dispersant PVA into the water, turn on the Microfluidizer M-110L high-pressure micro-jet homogenizer, adjust the pressure to 12,000 pounds per square inch PSI, and disperse the graphene material on the basis of emulsification of the dispersant, A dispersion was obtained. After standing still, take the upper layer dispersion liquid. Then add 2wt% binder CMC high-speed shear dispersion to the dispersion, adjust the viscosity at 600-2000 centipoise, and obtain the conductive graphene coating liquid; then, the aluminum foil is first roughened in sodium hydroxide or oxalic acid treated and dried. Coat the dispersed graphene coating solution on one or both sides of the pretreated aluminum foil material, and then dry it under vacuum at 120°C for 6 hours to obtain a graphene-coated aluminum foil product. The graphene coating layer Around 20 microns.

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Abstract

The invention discloses a preparation method of a graphene-coated aluminium foil current collector, comprising the following steps: dispersing graphene in a solvent, adding a certain amount of a dispersant, turning on a Microfluidizer M-110L high pressure micro-jet homogenizer, adjusting pressure to 400-10000 pounds / Sq. In. PSI, dispersing the graphene material on the basis of dispersant emulsification so as to obtain a primary dispersion liquid, standing, and fetching the upper-layer dispersion liquid; carrying out high-speed shear dispersion by adding 0.5-10% of a binder into the above upper-layer dispersion liquid, and adjusting viscosity to 300-1500 centipoises so as to prepare a uniform compound conductive graphite coating solution; carrying out surface roughening pretreatment on an aluminium foil, coating the surface of the pretreated aluminium foil material with the compound conductive graphite coating solution, and carrying out vacuum drying at the temperature of 80-120 DEG C so as to prepare the graphene-coated aluminium foil current collector. The invention also relates to a graphene-coated aluminium foil current collector obtained by the above method.

Description

technical field [0001] The invention relates to the field of current collector materials for lithium-ion batteries, in particular to a high-performance graphene-coated aluminum foil current collector and a preparation method thereof. Background technique [0002] As a strategic emerging industry, new energy vehicles are developing from demonstration operation to marketization on a global scale. The power battery as its core component is developing rapidly, and the demand gap has further expanded in the past two years. As a type of mobile power supply, lithium-ion batteries are widely used in mobile communications, digital cameras, notebook computers and other portable electronic devices, as well as power tools and drones due to their outstanding performance such as high energy density, long cycle life, and small self-discharge. , electric scooters, military defense and aerospace and other fields. When used as an on-board power supply for new energy vehicles, power batteries...

Claims

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Application Information

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IPC IPC(8): H01M4/66
CPCH01M4/663H01M4/667Y02E60/10
Inventor 彭成信
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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