Three-dimensional porous lithium ion battery anode material of graphene composite material and preparation method of three-dimensional porous lithium ion battery anode material

A lithium-ion battery, three-dimensional porous technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor compatibility between graphite and engraving, irreversible capacity loss, etc., achieve simple and easy control of the reduction process, and improve cycle stability. Sexual, low-density effects

Inactive Publication Date: 2015-11-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphite has poor compatibility with melting and etching, and is very sensitive to electrolytes. As a result, a layer of solid electrolyte interface film (Solid Electrolyte Interface) will be formed on the electrode surface during the first charge and discharge process, resulting in irreversible capacity loss.

Method used

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  • Three-dimensional porous lithium ion battery anode material of graphene composite material and preparation method of three-dimensional porous lithium ion battery anode material
  • Three-dimensional porous lithium ion battery anode material of graphene composite material and preparation method of three-dimensional porous lithium ion battery anode material
  • Three-dimensional porous lithium ion battery anode material of graphene composite material and preparation method of three-dimensional porous lithium ion battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take raw material graphene oxide (GO) 100mg, titanium dioxide (TiO 2 ) 100mg, polyvinyl alcohol (PVA) 100mg, dissolved in 20ml deionized water, heated to 90°C in a water bath, stirred for 2h and mixed evenly;

[0035] GO / TiO 2 / PVA dispersion is placed in 5.3cm 3 Put it in a silica gel mold, put it in a freezer at -30°C for 24 hours, take it out, put the obtained solid into a freeze dryer at -50°C, 10Pa for 24 hours, and obtain a cylindrical polyvinyl alcohol-regulated solid GO / TiO 2 / PVA three-dimensional porous material.

[0036] The obtained product was heated to 250° C. in a vacuum heat treatment furnace at a heating rate of 3° C. / min, and kept at a pressure of 50 Pa for 30 minutes. The highly elastic three-dimensional porous r-GO / TiO 2 / PVA material.

[0037] The shape and size of 3D porous graphene / semiconductor nanoparticle composites, such as figure 1 shown. It can be seen that the solid GO / TiO before reduction 2 / PVA material presents the tan color of G...

Embodiment 2

[0044] Take raw materials graphene oxide (GO) 100mg, silicon powder (Si) 100mg, polyvinyl alcohol (PVA) 50mg, dissolve in 50ml deionized water, heat to 90°C in a water bath, stir for 3h and mix well;

[0045] The obtained product was divided into silica gel molds, put into a freezer at -30°C for 24 hours, and then taken out, and the obtained solid was placed in a freeze dryer at -50°C and 10 Pa for 30 hours of sublimation drying to obtain a cylindrical polyvinyl alcohol adjustment solid three-dimensional porous graphene oxide composites.

[0046] The obtained product was heated in a vacuum heat treatment furnace to 280° C., kept for 30 minutes, and the pressure was at normal pressure. That is, a highly elastic three-dimensional porous r-GO / Si / PVA material was obtained.

Embodiment 3

[0048] Get raw material graphene oxide (GO) 100mg, ferric oxide (Fe 3 o 4 ) 100mg, polyvinyl alcohol (PVA) 40mg, dissolved in 20ml deionized water, heated to 80°C in a water bath, stirred for 2h and mixed evenly;

[0049] The obtained product is divided into 5.3cm 3 Put it in a silica gel mold, freeze it in a freezer at -30°C for 18 hours, take it out, and put the obtained solid into a freeze dryer at -50°C, 10Pa for 36 hours of sublimation drying to obtain a cylindrical polyvinyl alcohol-regulated solid GO / Fe 3 o 4 / PVA three-dimensional porous material.

[0050] Heat the obtained product to 300°C in a vacuum heat treatment furnace, keep it warm for 50min, and keep the pressure at 100Pa. The highly elastic three-dimensional porous r-GO / Fe 3 o 4 / PVA material.

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Abstract

The invention discloses a three-dimensional porous lithium ion battery anode material of a graphene composite material and a preparation method of the lithium ion battery anode material. The preparation method of the three-dimensional porous lithium ion battery anode material comprises the following steps: dissolving oxidized graphene, semiconductor nanoparticles and polyvinyl alcohol into water, and mixing the raw materials evenly; carrying out freeze drying on the mixture obtained from the previous step in a mold, and obtaining a solid oxidized graphene / semiconductor nanoparticle / polyvinyl alcohol three-dimensional porous nano-material; carrying out thermal treatment reduction on the product which is obtained from the previous step, restoring the electrical conductivity of the product, and obtaining a high-elasticity solid oxidized graphene / semiconductor nanoparticle / polyvinyl alcohol three-dimensional porous graphene composite material; and cutting the material obtained from the previous step into slices to serve as the anode material assembling battery of a lithium ion battery, and obtaining the three-dimensional porous lithium ion battery anode material of the graphene composite material. According to the three-dimensional porous lithium ion battery anode material disclosed by the invention, the electrical conductivity of the graphene material can be restored; the three-dimensional porous lithium ion battery anode material has a three-dimensional continuous conductive network and the cycling stability; and the mechanical property of the material can be adjusted.

Description

technical field [0001] The invention belongs to the field of three-dimensional porous graphene composite material foam, in particular to a preparation method and application of a three-dimensional porous graphene composite lithium ion battery negative electrode material. Background technique [0002] Carbon anode materials are currently the most widely used anode materials for lithium-ion batteries. Graphitized carbon materials have high crystallinity, good conductivity, and a neat layered structure. When charging, lithium ions are intercalated into the interlayer to form lithium carbon compounds (theoretical composition is LiC 6 ), so the theoretical capacity of graphite-based materials is 372mAh / g. However, graphite has poor compatibility with melting and etching, and is very sensitive to electrolytes. As a result, a layer of solid electrolyte interface film (Solid Electrolyte Interface) will be formed on the electrode surface during the first charge and discharge process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/48H01M4/62H01M4/587H01M4/50H01M4/52H01M4/36H01M10/0525
CPCH01M4/364H01M4/386H01M4/48H01M4/50H01M4/52H01M4/587H01M4/622H01M10/0525Y02E60/10
Inventor 陈坚高莹史相如王文秀沈园方
Owner SOUTHEAST UNIV
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