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Graphene composite negative current collector, preparation method thereof and lithium ion battery

A graphene composite and current collector technology, which is applied in the field of electrochemical power sources, can solve the problems of affecting battery life, metal materials are easily corroded, and battery energy density is low, and achieve chemical stability and corrosion resistance, light weight, and non-embedded The effect of lithium

Inactive Publication Date: 2014-02-12
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high density and heavy weight of the metal current collector, the weight of the general current collector accounts for 20-25% of the entire battery, and the proportion of the electrode material to the entire battery is greatly reduced, resulting in a lower energy density of the battery.
At the same time, metal materials are easily corroded, which affects the service life of the battery

Method used

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  • Graphene composite negative current collector, preparation method thereof and lithium ion battery
  • Graphene composite negative current collector, preparation method thereof and lithium ion battery
  • Graphene composite negative current collector, preparation method thereof and lithium ion battery

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preparation example Construction

[0025] The example of the present invention also provides a method for preparing a graphene composite negative electrode current collector with simple process, high efficiency, and easy operation and control. For the preparation method process flow of the graphene composite negative electrode current collector, please refer to figure 2 , see also figure 1 , including the following steps:

[0026] Step S01. Preparation of graphene film: vacuum filter the graphene suspension with a microporous membrane, dry the filter cake and separate the microporous membrane to obtain graphene film 1;

[0027] Step S02. Prepare the metal oxide layer 2 by electrodeposition: use the graphene film 1 prepared in step S01 as a working electrode, and place it in an alkaline electrolyte containing a metal salt with a concentration of 0.25-0.5 mol / L. 0.5~3mA / cm 2 Electrodeposition under the action of a constant current for 5 to 10 minutes; wherein, the metal salt in the electrolyte is a metal salt...

Embodiment 1

[0060] A graphene composite negative electrode current collector and preparation method thereof:

[0061] The structure of the graphene composite negative electrode current collector is as follows: figure 1 As shown, it includes a graphene film layer 1 and a metal oxide layer 2 combined on both sides of the graphene film layer 1. Wherein, the thickness of the metal oxide layer 2 is 1 μm, and the oxide is Cr 2 o 3 ; The thickness of the graphene film layer 1 is 3 μm.

[0062] The specific steps of the preparation method of the graphene composite negative electrode current collector are as follows:

[0063] S11. Preparation of graphene oxide suspension: add graphite oxide to deionized water, ultrasonically for 0.5h, configure a uniformly dispersed graphene oxide suspension with a concentration of 0.25mg / ml, then add ammonia water, adjust the pH value, and make it pH value reaches 10;

[0064] S12. Preparation of graphene suspension: add hydrazine hydrate (85%) (wherein mass...

Embodiment 2

[0069] A graphene composite negative electrode current collector and preparation method thereof:

[0070] The graphene composite negative electrode current collector structure in Example 1 of the graphene composite negative electrode current collector structure. Among them, the thickness of the metal oxide layer is 1 μm, and the oxide is MnO 2 ; The thickness of the graphene film layer is 5 μm.

[0071] The specific steps of the preparation method of the graphene composite negative electrode current collector are as follows:

[0072] S21. Preparation of graphene oxide suspension: add graphite oxide to ethanol, ultrasonicate for 1 h, configure a uniformly dispersed graphene oxide suspension with a concentration of 1 mg / ml, then add ammonia water, adjust the pH value, and make the pH value reach 11 ;

[0073] S22. Preparation of graphene suspension: Add hydrazine hydrate (85%) to the graphene oxide suspension (the mass ratio of RN 2 h 4 / GO=7:10) solution, react at a temper...

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Abstract

The invention discloses a graphene composite negative current collector, a preparation method thereof and a lithium ion battery. The graphene composite negative current collector comprises a graphene thin-film layer and a metal oxide layer combining with the surface of the graphene thin-film layer, and the metal oxide in the metal oxide layer is at least one of Cr2O3, MnO2, V2O5 and TiO2. The graphene composite negative current collector is high in mechanical strength and light in weight, and also is capable of effectively preventing lithium ions from being embedded in the graphene thin-film layer, avoiding generation of irreversible capacity and further improving the capacity. The preparation method is simple in technology, easily controllable in conditions and low in equipment requirements.

Description

technical field [0001] The invention belongs to the technical field of electrochemical power sources, and in particular relates to a graphene composite negative electrode current collector, a preparation method thereof, and a lithium ion battery. Background technique [0002] The current collector is a structure or part that collects current. Its main function is to collect the current generated by the active materials of the battery, provide electron channels, accelerate charge transfer, and improve the coulombic efficiency of charge and discharge. As a current collector, it needs to meet the characteristics of high electrical conductivity, good mechanical properties, light weight, and small internal resistance. [0003] As a current collector, it needs to be light in weight, because the main factors affecting the energy density of the battery are the capacity of the electrode material, the voltage of the system, and the proportion of the electrode material to the total wei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCY02E60/122H01M4/66H01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 周明杰吴凤王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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