A kind of negative electrode current collector of lithium metal secondary battery and preparation method thereof

A secondary battery, current collector technology, applied in battery electrodes, lithium batteries, electrode carriers/current collectors, etc., can solve problems such as uniform deposition that is not bottom-up, achieve easy control, simple operation, and reduce actual current. The effect of density

Active Publication Date: 2021-06-22
BEIJING INSTITUTE OF TECHNOLOGYGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some researchers have used highly conductive three-dimensional current collectors to limit the volume expansion of lithium metal anodes during electrochemical cycling, the current cross-linked highly conductive three-dimensional materials are prone to form equipotential bodies, making lithium metal the first in the world. Top layer deposition, rather than bottom-up uniform deposition

Method used

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  • A kind of negative electrode current collector of lithium metal secondary battery and preparation method thereof
  • A kind of negative electrode current collector of lithium metal secondary battery and preparation method thereof
  • A kind of negative electrode current collector of lithium metal secondary battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] (1) Add 10 mg of graphene oxide solution containing 10 mg of graphene oxide sheets with a size of 20 μm to 50 μm and a concentration of 10 mg / mL into 4 mL of deionized water, stir magnetically for 30 minutes and then ultrasonicate for 120 minutes to form an aqueous solution of graphene oxide. The aqueous solution of graphene is prepared three parts;

[0036] (2) Add 80 mg, 40 mg, and 20 mg of zinc acetate into three portions of 5 mL deionized water one by one, and add 2 mg of carbon nanotubes with a length of 0.5 μm to 2 μm to the three portions of zinc acetate aqueous solution, and stir magnetically for 30 minutes. After ultrasonication for 120min, three carbon nanotube suspensions were obtained;

[0037] (3) Three parts of graphene oxide aqueous solution and three parts of carbon nanotube suspensions were mixed one by one, magnetically stirred for 30 minutes and then ultrasonicated for 60 minutes to obtain three parts of mixed suspensions;

[0038] (4) Suction filter...

Embodiment 2

[0044] (1) Add 10 mg of graphene oxide solution containing 10 mg of graphene oxide sheets with a size of 20 μm to 50 μm and a concentration of 10 mg / mL into 4 mL of deionized water, stir magnetically for 30 minutes and then ultrasonicate for 120 minutes to form an aqueous solution of graphene oxide. The aqueous solution of graphene is prepared three parts;

[0045] (2) Add 100 mg, 50 mg, and 25 mg of zinc acetate into three portions of 5 mL deionized water one by one, and add 2 mg of carbon nanotubes with a length of 0.5 μm to 2 μm to the three portions of zinc acetate aqueous solution, and stir magnetically for 30 minutes. After ultrasonication for 120min, three carbon nanotube suspensions were obtained;

[0046] (3) Three parts of graphene oxide aqueous solution and three parts of carbon nanotube suspensions were mixed one by one, magnetically stirred for 30 minutes and then ultrasonicated for 60 minutes to obtain three parts of mixed suspensions;

[0047] (4) Suction filte...

Embodiment 3

[0052] (1) Add 10 mg of graphene oxide solution containing 10 mg of graphene oxide sheets with a size of 20 μm to 50 μm and a concentration of 10 mg / mL into 4 mL of deionized water, stir magnetically for 30 minutes and then ultrasonicate for 120 minutes to form an aqueous solution of graphene oxide. The aqueous solution of graphene is prepared three parts;

[0053] (2) Add 80 mg, 40 mg, and 20 mg of zinc acetate into three portions of 5 mL deionized water one by one, and add 1 mg of carbon nanotubes with a length of 0.5 μm to 2 μm to the three portions of zinc acetate aqueous solution, and stir magnetically for 30 minutes After ultrasonication for 120min, three carbon nanotube suspensions were obtained;

[0054] (3) Three parts of graphene oxide aqueous solution and three parts of carbon nanotube suspensions were mixed one by one, magnetically stirred for 30 minutes and then ultrasonicated for 60 minutes to obtain three parts of mixed suspensions;

[0055] (4) Suction filter ...

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Abstract

The invention relates to a negative electrode current collector of a lithium metal secondary battery and a preparation method thereof, belonging to the technical field of lithium metal secondary batteries. The current collector is composed of three layers of ZnO / graphene / carbon nanotubes, and the ZnO content gradually decreases from the bottom layer to the top layer. Correspondingly, the lithium affinity gradually weakens from the bottom layer to the top layer, which is conducive to the uniform deposition of metal lithium from the bottom layer to the top layer. , so as to solve the problem of metal lithium deposition on the top layer; in addition, the skeleton of the current collector is a highly conductive porous lamellar structure, and the larger specific surface area is conducive to reducing the actual current density and alleviating dendrite growth. More pores The problem of volume expansion in the cycle process can be limited; moreover, the preparation process of the current collector is simple and easy to control, which provides new opportunities for the practical application of lithium metal secondary batteries.

Description

technical field [0001] The invention relates to a negative electrode current collector of a lithium metal secondary battery and a preparation method thereof, belonging to the technical field of lithium metal secondary batteries. Background technique [0002] Since the advent of lithium-ion secondary batteries, great progress has been made, and they are widely used in portable electronic devices and new energy electric vehicles. However, with the continuous development of various high-performance equipment, especially new energy electric vehicles, people's requirements for the energy density of lithium-ion batteries continue to increase, and it is increasingly difficult for traditional lithium-ion secondary batteries to meet people's requirements for energy density and safety performance. etc. requirements. The development of high specific energy batteries should be based on high specific energy materials, and lithium metal negative electrodes have the highest theoretical sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M10/052
CPCH01M4/663H01M4/667H01M10/052Y02E60/10
Inventor 谢嫚位广玲吴锋夏信德蒋文全周佳辉
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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