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Graphene/metal composite negative electrode material for lithium ion battery and preparation method of graphene/metal composite negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficult fluid collection, easy stacking of negative electrode materials, and verticality, so as to simplify the production process, improve production efficiency, and reduce production costs Effect

Inactive Publication Date: 2014-12-03
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems that the graphene negative electrode material used in the existing lithium ion battery is easy to stack, and is difficult to be perpendicular to the current collector, etc., designs and prepares a graphene negative electrode material for the lithium ion battery with a new structure, and the specific structure is as follows figure 1 Shown:

Method used

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  • Graphene/metal composite negative electrode material for lithium ion battery and preparation method of graphene/metal composite negative electrode material
  • Graphene/metal composite negative electrode material for lithium ion battery and preparation method of graphene/metal composite negative electrode material
  • Graphene/metal composite negative electrode material for lithium ion battery and preparation method of graphene/metal composite negative electrode material

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Embodiment 1

[0031] Under ice bath conditions, 3.0g of graphite was added to 60ml of concentrated sulfuric acid, stirred vigorously for 30min, and further 12gKMnO 4 Add to the above mixture and stir vigorously for 30min. Transfer the above mixture to a 30°C water bath, slowly add 18g NaNO 3 , stirred for 60min; while stirring, continuously added 140ml of deionized water to the above mixture, then transferred it to an oil bath at a temperature of 90°C, stirred for 30min; then added 18ml of H 2 o 2 , continue to react for 60min to make the solution change from dark brown to bright yellow;

[0032] Under stirring conditions, add 1.5wt% dispersing agent PAA of graphene oxide to the above graphene oxide solution, dissolve and add 20ml of hydrazine hydrate solution dropwise, react at 60°C for 1h, and further dissolve in the above solution 20ml of 20wt% acetic acid aqueous solution was added dropwise, and the reaction was continued for 30min to obtain a stable graphene aqueous solution.

[00...

Embodiment 2

[0037] Under ice bath conditions, 3.0g of graphite was added to 60ml of concentrated sulfuric acid, stirred vigorously for 30min, and further 12gKMnO 4 Add to the above mixture and stir vigorously for 30min. Transfer the above mixture to a 30°C water bath, slowly add 18g NaNO 3 , stirred for 60min; while stirring, continuously added 140ml of deionized water to the above mixture, then transferred it to an oil bath at a temperature of 90°C, stirred for 30min; then added 18ml of H 2 o 2 , continue to react for 60min to make the solution change from dark brown to bright yellow;

[0038] Under stirring conditions, add 2.5wt% dispersing agent PAA of graphene oxide to the above graphene oxide solution, dissolve and add 20ml of hydrazine hydrate solution dropwise, react at 80°C for 1h, and further dissolve in the above solution 20ml of 10wt% acetic acid aqueous solution was added dropwise, and the reaction was continued for 40min to obtain a stable graphene aqueous solution.

[00...

Embodiment 3

[0043] Under ice bath conditions, 3.0g of graphite was added to 60ml of concentrated sulfuric acid, stirred vigorously for 30min, and further 12gKMnO 4 Add to the above mixture and stir vigorously for 30min. Transfer the above mixture to a 30°C water bath, slowly add 18g NaNO 3 , stirred for 60min; while stirring, continuously added 140ml of deionized water to the above mixture, then transferred it to an oil bath at a temperature of 90°C, stirred for 30min; then added 18ml of H 2 o 2 , continue to react for 60min to make the solution change from dark brown to bright yellow;

[0044] Under stirring conditions, add 2.5wt% dispersing agent PAA of graphene oxide to the above graphene oxide solution, dissolve and add 20ml of hydrazine hydrate solution dropwise, react at 80°C for 1h, and further dissolve in the above solution 20ml15wt% acetic acid aqueous solution was added dropwise, and the reaction was continued for 50min to obtain a stable graphene aqueous solution.

[0045] ...

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Abstract

The invention relates to a graphene / metal composite negative electrode material for a lithium ion battery and a preparation method of the graphene / metal composite negative electrode material. The preparation method comprises the following steps of: preparing a metal electrode with an optical grating structure by chemical etching, preparing graphene / titanium dioxide composite particles by using a redoxchemistry method, depositing the graphene / titanium dioxide composite particles on the metal electrode with the optical grating structure, and carrying out further heat treatment to obtain the graphene / metal composite negative electrode material. According to the graphene / metal composite negative electrode material and the preparation method, the nano titanium dioxide particles are used for modifying the stacking of graphene, and the metal optical grating structure is used as a graphene carrier, so that the graphene can be vertical to a current collector to be arranged into an array; by virtue of the structure, the diffusion distance of lithium ions among graphene sheets is shortened, and meanwhile, the lithium ions can be embedded and withdrawn among the graphene sheets more rapidly; and therefore, the graphene / metal composite negative electrode material has high specific capacity, excellent cycling stability and rate capability when being used as a negative electrode of a lithium ion battery and is hopeful to be used as a negative electrode material, with high energy density and high power density, of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of material synthesis and energy, and in particular relates to a graphene / metal composite negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] Graphene is a new type of carbonaceous material prepared from graphite. The application potential of single-layer or thin-layer graphite (multilayer graphene with 2-10 layers) in chemical power sources has also attracted much attention. Graphene is a single layer of carbon atoms, and both the upper and lower surfaces can store lithium ions. It can be used as a negative electrode material for lithium-ion batteries. At the same time, due to its excellent mechanical properties and electrical conductivity, graphene is also commonly used to compound with other negative electrode materials to improve electrode performance. . [0003] Graphene has excellent electrochemical properties, and many researchers hope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/133H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 方岱宁孙友谊张用吉池慧娟唐敬达
Owner PEKING UNIV
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