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Preparation method of porous graphene/silver nanoparticle composite lithium metal secondary battery negative current collector

A technology of silver nanoparticles and porous graphene, which is applied in the field of preparation of lithium metal battery materials, can solve the problems of short battery cycle life, obstacles to the application of metal lithium negative electrodes, and poor safety performance, so as to reduce local current density and improve service life , The effect of reducing the overpotential

Inactive Publication Date: 2019-03-08
ANQING NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the uncontrolled growth of dendrites on the surface of lithium metal anodes during repeated lithium stripping / deposition processes will cause problems such as short battery cycle life and poor safety performance, which seriously hinders the application of metal lithium anodes.

Method used

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  • Preparation method of porous graphene/silver nanoparticle composite lithium metal secondary battery negative current collector
  • Preparation method of porous graphene/silver nanoparticle composite lithium metal secondary battery negative current collector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] a) Ultrasonicate graphene oxide in aqueous solution for 1h to form a uniform graphene oxide solution with a concentration of 0.5mg / ml

[0028] b) adding 0.1% silver nanoparticles of graphene oxide to the polystyrene microsphere (particle size: 720nm) solution with a mass fraction of 0.5%, magnetically stirring for 20min under ultraviolet light irradiation

[0029] c) Fully mix the solutions in steps a and b and stir on a magnetic stirrer for 20min

[0030] d) The solution in step c is vacuum filtered to obtain a graphene oxide / polystyrene microsphere / silver nanoparticle composite material

Embodiment 2

[0032] a) Ultrasonicate graphene oxide in aqueous solution for 1 h to form a uniform graphene oxide solution with a concentration of 1 mg / ml

[0033] b) adding silver nanoparticles with 0.2% graphene oxide amount to the silica microsphere (particle diameter: 280nm) solution with a mass fraction of 0.5%, and magnetic stirring for 30min under ultraviolet light irradiation

[0034] c) Fully mix the solutions in steps a and b and stir on a magnetic stirrer for 30min

[0035] d) vacuum filter the solution in step c to obtain a graphene oxide / silicon dioxide microsphere / silver nanoparticle composite material

[0036] e) Soak the material in step d in hydrogen fluoride solution for 30 minutes to remove the silica template, and then treat it at 800°C for 6h (5°C / min) to obtain the desired material

Embodiment 3

[0038] a) Ultrasonicate graphene oxide in aqueous solution for 1 h to form a uniform graphene oxide solution with a concentration of 2 mg / ml

[0039] b) adding silver nanoparticles with 0.3% graphene oxide amount to the solution of polystyrene microspheres (particle size: 320nm) with a mass fraction of 1%, and magnetic stirring for 40min under ultraviolet light irradiation

[0040] c) Fully mix the solutions in steps a and b and stir on a magnetic stirrer for 40min

[0041] d) The solution in step c is vacuum filtered to obtain a graphene oxide / polystyrene microsphere / silver nanoparticle composite material

[0042] e) Treat the material in step d at 400°C for 3h (2°C / min) to remove the polystyrene template, and then treat it at 900°C for 4h (5°C / min) to obtain the desired material

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Abstract

The invention discloses a preparation method of a porous graphene / silver nanoparticle composite lithium metal secondary battery negative current collector. The method includes the following steps: 1,dispersing graphene oxide in an aqueous solution to form a uniform graphene oxide solution; 2, adding silver nanoparticles into a micro / nano microsphere template solution, and fully stirring under theirradiation of ultraviolet light to uniformly load the silver nanoparticles on template microspheres; 3, mixing the solutions obtained in the steps 1 and 2, and performing ultrasonic treatment in anultrasonic cleaning machine; 4, performing vacuum filtration on the mixed solution obtained in the step 3 to obtain graphene oxide, micro / nano template microsphere and silver nanoparticle composite materials; and 5, processing the composite material obtained in the step 4, removing the micro / nano template microspheres to obtain a porous graphene oxide / silver nanoparticle material, and finally carrying out sintering to obtain the required porous graphene / silver nanoparticle composite material. The material can be directly used in a negative electrode of a lithium metal secondary battery.

Description

technical field [0001] The invention relates to a preparation method of a lithium metal battery material, in particular to a preparation method of a negative electrode current collector of a lithium metal secondary battery. Background technique [0002] 1. Due to its high theoretical capacity (3860mA h g -1 ) and low electrochemical potential (-3.04 V, compared to the standard hydrogen electrode), has become an inevitable choice for the anode of the next generation of high specific energy lithium batteries. However, the uncontrolled dendrite growth on the surface of lithium metal anodes during repeated lithium stripping / deposition processes will cause problems such as short battery cycle life and poor safety performance, which seriously hinders the application of metal lithium anodes. [0003] 2. Graphene is a two-dimensional crystal, which is composed of carbon atoms arranged in a hexagonal shape, connected to each other to form a carbon molecule, and its structure is very...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66B82Y30/00
CPCB82Y30/00H01M4/661H01M4/663H01M4/666Y02E60/10
Inventor 董彦杰潘林海白国梁王钧伟桑大申
Owner ANQING NORMAL UNIV
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