Nano zinc oxide-graphite-graphene composite material and its preparation method and application

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" The effect of initial irreversible capacity, alleviating volume change, and avoiding rapid attenuation
CN104617256BActive Publication Date: 2017-07-28石家庄市贝德化工有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
石家庄市贝德化工有限公司
Publication Date
2017-07-28

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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.
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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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