Three-dimensional porous copper/graphene composite current collector for secondary metal lithium battery negative pole

A graphene composite, three-dimensional porous technology, applied in the direction of secondary batteries, electrode carriers/current collectors, battery electrodes, etc., can solve the problems of lithium dendrite generation, low cycle coulombic efficiency, etc., to suppress the generation of lithium dendrites, Simple process, inhibited growth effect

Inactive Publication Date: 2018-03-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these three-dimensional porous current collectors lack surface modification treatment, so defects on the microscopic surface of porous metals will still lead to the generation of lithium dendrites, especially for three-dimensional porous current collectors with high specific surface area, the lithium dendrites on the microscopic surface The production will directly lead to low cycle Coulombic efficiency

Method used

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  • Three-dimensional porous copper/graphene composite current collector for secondary metal lithium battery negative pole
  • Three-dimensional porous copper/graphene composite current collector for secondary metal lithium battery negative pole
  • Three-dimensional porous copper/graphene composite current collector for secondary metal lithium battery negative pole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of nanoporous copper. Cu with a thickness of 100 μm was selected 30 mn 70 Alloy foil and cut it to 1×1cm 2 size. Then immerse the alloy foil in a 0.05M hydrochloric acid solution, and carry out dealloying at room temperature for 60 minutes. After the end, the foil is sequentially washed with deionized water-alcohol, and then dried in a vacuum drying oven for 4 hours to obtain nano porous copper.

[0025] (2) Preparation of three-dimensional porous copper / graphene current collectors. Put nanoporous copper into the quartz ark, place the ark in the reaction tube furnace near the nozzle area, and feed argon and hydrogen, the gas ratio is Ar:H 2 =500:200 sccm. Raise the temperature of the tube furnace to 900°C. When the furnace temperature reaches 900°C, quickly move the quartz ark from the nozzle area to the constant temperature area in the middle of the reaction tube, and react at this temperature for 3 minutes. Then feed ammonia, acetylene, argon an...

Embodiment 2

[0030] The difference from Example 1 is: (2) preparing a three-dimensional porous copper / graphene current collector. Put nanoporous copper into the quartz ark, place the ark in the reaction tube furnace near the nozzle area, and feed argon and hydrogen, the gas ratio is Ar:H 2=500:200 sccm. Raise the temperature of the tube furnace to 900°C. When the furnace temperature reaches 900°C, quickly move the quartz ark from the nozzle area to the constant temperature area in the middle of the reaction tube, and react at this temperature for 3 minutes. Then pass through acetylene, argon and hydrogen, the gas ratio is C 2 h 2 :Ar:H 2 =30:50:500:200sccm, reacted under these conditions for 2 minutes. The rest are the same as in Embodiment 1, and will not be repeated here.

[0031] The obtained current collector has a three-dimensional through pore structure, and its pore diameter is in the range of 1.0-2.0 μm, but the distribution of graphene on its surface is not uniform.

Embodiment 3

[0033] The difference from Example 1 is: (2) preparing a porous copper / graphene current collector. Put nanoporous copper into the quartz ark, place the ark in the reaction tube furnace near the nozzle area, and feed argon and hydrogen, the gas ratio is Ar:H 2 =500:200 sccm. Raise the temperature of the tube furnace to 900°C. When the furnace temperature reaches 900°C, quickly move the quartz ark from the nozzle area to the constant temperature zone in the middle of the reaction tube, and react at this temperature for 0.5 minutes. Then pass through acetylene, argon and hydrogen, the gas ratio is C 2 h 2 :Ar:H 2 =5:500:200sccm, react under these conditions for 10 minutes. The rest are the same as in Embodiment 1, and will not be repeated here.

[0034] The obtained current collector has a three-dimensional through pore structure, and its pore diameter is in the range of 400-500nm.

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Abstract

The invention relates to a preparation method of a three-dimensional porous copper / graphene composite current collector for a secondary metal lithium battery negative pole. The preparation method includes: putting a nano porous metal foil into a quartz boat, and calcining for 0.5-5min at temperature of 800-1000 DEG C in an atmosphere of argon and hydrogen; feeding ammonia gas, acetylene, argon andhydrogen, and allowing reaction in the condition for 2-10min to obtain the three-dimensional porous copper / graphene composite current collector. The invention further provides a method of utilizing the current collector to prepare the metal lithium negative pole.

Description

technical field [0001] The invention belongs to the field of lithium metal secondary battery electrode materials, and in particular relates to a preparation method of a three-dimensional porous copper / graphene composite current collector and a metal lithium negative electrode capable of effectively suppressing lithium dendrites. Background technique [0002] With the extensive use of new energy sources (such as wind energy, solar energy, etc.), people have put forward higher requirements for energy storage materials, and traditional lithium-ion batteries are difficult to meet people's energy storage needs. Lithium metal has high theoretical specific capacity (3860mAh / g), low standard potential (-3.04V), and low density (0.53g / cm 3 ) and other advantages, making it one of the most suitable materials for secondary battery negative electrodes. Therefore, as early as the 1970s, there were reports of using metal lithium as the negative electrode of secondary batteries. For exam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/1395H01M10/0525
CPCH01M4/1395H01M4/661H01M4/663H01M4/666H01M4/80H01M10/0525Y02E60/10
Inventor 师春生张睿赵乃勤何春年刘恩佐何芳马丽颖李群英
Owner TIANJIN UNIV
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