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Nano-zinc oxide-graphite-graphene composite material as well as preparation method and application thereof

A technology of nano-zinc oxide and composite materials, which is applied in the field of nano-zinc oxide-graphite-graphene composite materials and its preparation and application, can solve the problems of reduced electrode cycle life, low charge and discharge capacity, and easy "agglomeration" to reduce The effect of initial irreversible capacity, alleviating volume change, and avoiding rapid attenuation

Active Publication Date: 2015-05-13
湖州优研知识产权服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the low charge and discharge capacity of the existing graphite negative electrode materials, the volume is prone to expansion and contraction, causing the grains to break, the structure to collapse, resulting in the destruction of the electrode, reducing the cycle life of the electrode, and de-intercalating lithium. The defect that it is easy to "agglomerate" during the reaction leads to a decrease in capacity, and a nano-zinc oxide-graphite-graphene composite material and its preparation method and application are provided

Method used

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  • Nano-zinc oxide-graphite-graphene composite material as well as preparation method and application thereof
  • Nano-zinc oxide-graphite-graphene composite material as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0046] Take by weighing 10g tetraamminezinc sulfate (Zn(NH 3 ) 4 SO4 ) and 10g of petroleum pitch were dissolved in 300ml of ethanol and stirred evenly to obtain solution A. Add 100g of natural spherical graphite (with a particle size of 0.5-1 μm) and 2g of graphene oxide into an aqueous solution of polyethylene glycol (PEG-4000) with a concentration of 10% by mass, and ultrasonically disperse for 30 minutes to obtain a suspension B. After mixing Solution A and Suspension B, add 50g of polyvinylpyrrolidone (weight average molecular weight: 8000~10000), stir well, then add dropwise 300mL of a mixture of ammonia water and ethanol (the volume ratio of ammonia water and ethanol is 1:50) , to obtain the sol-gel system C. Dry the above-mentioned sol-gel system C at 80°C for 3 hours, then raise the temperature to 200°C and dry for 4 hours to obtain precursor D; the precursor D is calcined and heat-treated at 1500°C in nitrogen for 9 hours to obtain nano-oxidized Zinc-graphite-grap...

Embodiment 2

[0050] Take by weighing 10g zinc tetraammonium carbonate (Zn(NH 3 ) 4 CO 3 ) and 20g of coal tar pitch were dissolved in 400ml of methanol and stirred evenly to obtain solution A. Add 80g of colloidal graphite (with a particle size of 0.5-1 μm) and 1g of graphene oxide into an aqueous solution of polyethylene glycol (PEG-8000) with a concentration of 5% by mass, and ultrasonically disperse for 50 minutes to obtain a suspension B. After mixing solution A and suspension B, add 60g polyvinylpyrrolidone (weight average molecular weight: 8000~10000), stir evenly, then add 500mL of a mixture of ammonia water and ethanol (the volume ratio of ammonia water and ethanol is 1:20) dropwise , to obtain the sol-gel system C. The above-mentioned sol-gel system C was dried at 90°C for 3 hours, then heated to 180°C and dried for 6 hours to obtain precursor D; the precursor D was calcined and heat-treated at 2000°C in nitrogen for 6 hours to obtain nano-oxidized Zinc-graphite-graphene compo...

Embodiment 3

[0054] Take by weighing 10g tetraammine zinc dichloride (Zn(NH 3 ) 4 Cl 2 ) and 5g of phenolic resin were dissolved in 200ml of isopropanol and stirred evenly to obtain solution A. Add 50g of natural spherical graphite (with a particle size of 0.5-1 μm) and 2g of graphene oxide into an aqueous solution of polyethylene glycol (PEG-6000) with a concentration of 20% by mass, and ultrasonically disperse for 40 minutes to obtain a suspension B. After mixing Solution A and Suspension B, add 50g of polyvinylpyrrolidone (weight average molecular weight: 8000~10000), stir well, then add dropwise 200mL of a mixture of ammonia water and ethanol (the volume ratio of ammonia water and ethanol is 1:10) , to obtain the sol-gel system C. The above-mentioned sol-gel system C was dried at 90°C for 3 hours, and then heated to 190°C and dried for 5 hours to obtain precursor D; the precursor D was calcined and heat-treated at 1200°C in helium for 10 hours to obtain nano Zinc oxide-graphite-gra...

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Abstract

The invention discloses a nano-zinc oxide-graphite-graphene composite material as well as a preparation method and application thereof. The nano-zinc oxide-graphite-graphene composite material comprises a core material and a coating layer, wherein the core material is composed of graphite and graphene; the coating layer is a uniform complex of nano-zinc oxide and amorphous carbon. The preparation method comprises the following steps: dissolving soluble zinc salt and organic high-molecular polymer into an alcohol organic solvent, and mixing uniformly to obtain a solution A; adding the mixture of graphite and graphene oxide into a polyethylene glycol aqueous solution, and dispersing uniformly through ultrasound to obtain suspension liquid B; mixing the solution A and the suspension liquid B, adding polyvinylpyrrolidone, uniformly stirring, and dropwise adding the mixture of ammonium hydroxide and alcohol to obtain a sol gel system C; drying and performing roasting heat treatment to obtain the nano-zinc oxide-graphite-graphene composite material. The nano-zinc oxide-graphite-graphene composite material is simple in preparation technology and better in cycle performance and can effectively relieve the volume change caused by charging and discharging.

Description

technical field [0001] The invention relates to a nano-zinc oxide-graphite-graphene composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are successfully used in various portable electronic devices, such as mobile phones, portable computers, etc., due to their high energy density and long service life. At present, industrialized lithium-ion batteries mainly use graphite as the negative electrode material, and the theoretical capacity of graphite is only 370mA h / g, which prompts researchers to look for substances with higher theoretical capacity to replace or dope graphite as the negative electrode material. Get a lithium-ion battery with higher storage capacity. [0003] Zinc oxide (ZnO) has a theoretical capacity of 978mA·h / g when it is used as an anode material for lithium-ion batteries. When bulk ZnO is used as the anode material of lithium-ion batteries, the electronic conductivity is low, the volume c...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/133H01M4/1391H01M4/1393
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M10/0525Y02E60/10
Inventor 钦琛
Owner 湖州优研知识产权服务有限公司
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