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Preparation method of nano germanium/three-dimensional porous graphene composite material and application of nano germanium/three-dimensional porous graphene composite material to negative electrode of lithium ion battery

A three-dimensional porous, composite material technology, applied in graphene, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve problems such as the volume change of germanium, and achieve the effects of low cost, excellent lithium storage performance, and simple and easy operation process

Active Publication Date: 2022-03-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, germanium usually undergoes severe volume changes during Li-ion intercalation / extraction, which is one of the biggest obstacles to practical applications.

Method used

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  • Preparation method of nano germanium/three-dimensional porous graphene composite material and application of nano germanium/three-dimensional porous graphene composite material to negative electrode of lithium ion battery
  • Preparation method of nano germanium/three-dimensional porous graphene composite material and application of nano germanium/three-dimensional porous graphene composite material to negative electrode of lithium ion battery
  • Preparation method of nano germanium/three-dimensional porous graphene composite material and application of nano germanium/three-dimensional porous graphene composite material to negative electrode of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0032] A preparation method of nano-germanium / three-dimensional porous graphene composite material, comprising the steps of:

[0033] 60 mg of graphite oxide was ultrasonically dispersed in 30 ml of deionized water, and ultrasonically dispersed for 2 hours to obtain a graphene oxide dispersion.

[0034] Prepare 0.05mol / L sodium chloride solution (containing sodium chloride 0.18g, deionized water 62ml), respectively mix 2.16g polydiallyldimethylammonium chloride (PDDA) and 0.36g tris(hydroxymethyl) Aminomethane hydrochloride was dissolved in sodium chloride solution, 0.18g polystyrene microspheres were added, ultrasonicated for 1h, stirred for 6h, the product was centrifuged, washed with deionized water, and freeze-dried (-50°C) to obtain PDDA Modified polystyrene microspheres.

[0035] Then 0.04 g of PDDA-modified polystyrene microspheres were ultrasonically dispersed in 40 ml of deionized water to obtain a PDDA-modified polystyrene microsphere dispersion.

[0036]Prepare a ...

Embodiment 2

[0044] A preparation method of nano-germanium / three-dimensional porous graphene composite material, comprising the steps of:

[0045] 60 mg of graphite oxide was ultrasonically dispersed in 30 ml of deionized water, and ultrasonically dispersed for 2 hours to obtain a graphene oxide dispersion.

[0046] Prepare 0.05mol / L sodium chloride solution (containing 0.18g of sodium chloride, 62ml of deionized water), respectively mix 2.16g of polydiallyldimethylammonium chloride (PDDA) and 0.36g of tris(hydroxymethyl) Aminomethane hydrochloride was dissolved in sodium chloride solution, 0.18g of polystyrene microspheres were added, ultrasonicated for 1h, stirred for 6h, the product was centrifuged, washed with deionized water, and freeze-dried (-50°C) to obtain PDDA Modified polystyrene microspheres.

[0047] Then 0.04 g of PDDA-modified polystyrene microspheres were ultrasonically dispersed in 40 ml of deionized water to obtain a PDDA-modified polystyrene microsphere dispersion.

[...

Embodiment 3

[0053] A preparation method of nano-germanium / three-dimensional porous graphene composite material, comprising the steps of:

[0054] 60 mg of graphite oxide was ultrasonically dispersed in 30 ml of deionized water, and ultrasonically dispersed for 2 hours to obtain a graphene oxide dispersion.

[0055] Prepare 0.05mol / L sodium chloride solution (containing 0.18g of sodium chloride, 62ml of deionized water), respectively mix 2.16g of polydiallyldimethylammonium chloride (PDDA) and 0.36g of tris(hydroxymethyl) Aminomethane hydrochloride was dissolved in sodium chloride solution, 0.18g of polystyrene microspheres were added, ultrasonicated for 1h, stirred for 6h, the product was centrifuged, washed with deionized water, and freeze-dried (-50°C) to obtain PDDA Modified polystyrene microspheres.

[0056] Then 0.04 g of PDDA-modified polystyrene microspheres were ultrasonically dispersed in 40 ml of deionized water to obtain a PDDA-modified polystyrene microsphere dispersion.

[...

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Abstract

The invention belongs to the technical field of preparation of nano composite materials, and relates to a preparation method of a nano germanium / three-dimensional porous graphene composite material. The preparation method comprises the following steps: preparing a graphene oxide dispersion liquid; then preparing a cationic polyelectrolyte modified polystyrene microsphere dispersion liquid; slowly adding polyvinylpyrrolidone and germanium dioxide into a sodium hydroxide solution, then adding the mixed solution into a cationic polyelectrolyte modified polystyrene microsphere dispersion liquid, then adding a graphene oxide dispersion liquid, adjusting the pH value with hydrochloric acid, dropwise adding into a sodium borohydride solution, precipitating and centrifuging, and drying to obtain the cationic polyelectrolyte modified polystyrene microspheres. And heating in inert / reducing mixed gas at 600-800 DEG C for 4-8 hours to obtain the catalyst. The nano germanium / three-dimensional porous graphene composite material is prepared by combining template-assisted thermal reduction with a freeze-drying method, the operation process is simple and easy to implement, the reaction time is short, the method is environmentally friendly and safe, the cost is low, and industrial implementation is easy. The prepared composite material has excellent lithium storage performance and is expected to be used as a negative electrode material of a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanocomposite materials, and relates to composite electrode materials, in particular to a preparation method of a nano-germanium / three-dimensional porous graphene (Ge / 3D porous graphene) composite material and its application to a negative electrode of a lithium-ion battery. Background technique [0002] Currently, the massive consumption of fossil fuel resources and growing environmental concerns have led to a growing demand for clean and renewable energy sources, which has promoted the development of low-cost, large-scale electrical energy storage systems (EESs). Lithium-ion batteries (LIBs) are considered as one of the most promising energy storage technologies and are widely used in various fields, such as electronic products, power tools, due to their high energy density, no memory effect, small self-discharge, and long cycle life. , electric vehicles, and energy storage. [0003] How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184B22F9/20B22F9/22B82Y30/00H01M4/36H01M4/38H01M4/62H01M4/13
CPCC01B32/184B22F9/20B22F9/22B82Y30/00H01M4/364H01M4/38H01M4/625H01M4/13
Inventor 陈耀沈小平季振源
Owner JIANGSU UNIV
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