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Graphene/graphene oxide coat composite electrode, battery and preparation method thereof

A graphene-coated, composite electrode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of structure pulverization, active material loss, etc., and achieve the effects of inhibiting loss, short process and high efficiency

Active Publication Date: 2018-12-14
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a very simple and easy-to-operate electrode structure optimization strategy to alleviate the common problems of structure pulverization and active material loss during the charging and discharging process of current high-capacity battery electrode materials, thereby improving the cycle stability of the electrode

Method used

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  • Graphene/graphene oxide coat composite electrode, battery and preparation method thereof
  • Graphene/graphene oxide coat composite electrode, battery and preparation method thereof
  • Graphene/graphene oxide coat composite electrode, battery and preparation method thereof

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Embodiment 1

[0031] In this embodiment, the active material is FeS 2 , the electrode is a two-dimensional planar electrode prepared by a slurry coating method.

[0032] The synthesis steps of the electrode coated on the surface of the active material with precise positioning of graphene oxide are as follows: disperse graphene oxide in aqueous solution, the concentration of graphene oxide is 2.0 mg / mL, add sodium dodecylbenzenesulfonate, dodecane The concentration of sodium phenylbenzenesulfonate was 5 mg / mL, stirred and sonicated to form a dispersion one. FeS 2 Mix with Super P and polyvinylidene fluoride at a mass ratio of 80:10:10, use 1-methyl-2-pyrrolidone as a dispersant, mix the above mixture evenly, make a slurry and apply it on copper foil, bake at 60°C After drying, the electrodes are cut out. The side of the electrode sheet coated with the material is horizontally contacted with the dispersion liquid, then dried, and repeated twice to obtain an electrode with a precisely and t...

Embodiment 2

[0036] In this embodiment, the active material is FeS 2 , the electrode is a two-dimensional planar electrode prepared by a slurry coating method.

[0037] Graphene oxide is dispersed in a mixed solution of water and ethanol, wherein the volume ratio of water and ethanol is 1:1. The graphene oxide concentration was 2.5 mg / mL, stirred and sonicated to form dispersion one. FeS 2 Mix with Super P and polyvinylidene fluoride at a mass ratio of 80:10:10, use 1-methyl-2-pyrrolidone as a dispersant, mix the above mixture evenly, make a slurry and apply it on copper foil, bake at 60°C After drying, it is cut to obtain pole pieces. The side of the pole piece coated with the material is horizontally contacted with the dispersion liquid, then dried, and repeated twice to obtain an electrode whose surface is precisely and tightly wrapped with a graphene oxide coating.

[0038] image 3 Scanning electron microscope (SEM) image of the electrode coated on the surface of the active mater...

Embodiment 3

[0040] In this embodiment, the active material is FeS 2 , the electrode is a two-dimensional planar electrode prepared by a slurry coating method.

[0041] The synthesis steps of the electrode coated on the surface of the active material with precise positioning of graphene oxide are as follows: disperse graphene oxide in aqueous solution, the concentration of graphene oxide is 2.0 mg / mL, add sodium dodecylbenzenesulfonate, dodecane The concentration of sodium phenylbenzenesulfonate was 4 mg / mL, stirred and sonicated to form a dispersion one. FeS 2 Mix with Super P and polyvinylidene fluoride at a mass ratio of 80:10:10, use 1-methyl-2-pyrrolidone as a dispersant, mix the above mixture evenly, make a slurry and coat it on carbon-clad copper foil, 60 After drying at ℃, the electrode pieces are cut out. The side of the pole piece coated with the material is vertically contacted with the dispersion liquid, then dried, and repeated twice to obtain an electrode whose surface is ...

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Abstract

The invention discloses a graphene / graphene oxide coated composite electrode, a battery and a preparation method thereof. In the electrode, graphene (oxide) can be precisely and closely coated on thesurface of an active material. The method comprises the following steps: contacting an electrode loaded with an active material with a graphene oxide dispersion liquid, utilizing the chemical interaction force of the active material and the graphene oxide in the liquid phase to achieve the coating of the graphene oxide on the surface of the active material, and obtaining the coating of the graphene on the surface of the active material by calcining treatment. The structure of precise and close coating of graphene oxide on the electrode can alleviate the problems of large volume change and serious loss of active material during charging and discharging of electrode materials with high energy density, and thus effectively improve the cycling stability of the materials. The graphene / grapheneoxide coated composite electrode disclosed by the invention has the advantages of simple operation and high efficiency, is suitable for continuous operation and large-scale production, and has wide application value and popularization significance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a graphene / graphene oxide-coated composite electrode, a battery and a preparation method thereof. Background technique [0002] At present, the demand for energy in human society is increasing continuously, and the extensive use of fossil energy has brought serious environmental pollution. Therefore, intermittent new energy and clean energy have emerged rapidly, such as wind energy, solar energy, and tidal energy, etc., but in terms of time and space The distribution is uneven, so its rational and effective use is inseparable from an efficient energy storage system. Rechargeable batteries play an extremely important role in the storage and utilization of clean energy. The development of batteries with high energy density and long-term cycle stability has become one of the current research and development directions. The current high specific energy batteries that are mainly researched ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/13H01M4/139
CPCH01M4/13H01M4/139H01M4/366H01M4/625Y02E60/10
Inventor 陈卫华张喜雪米立伟冯祥明张建民万延华
Owner ZHENGZHOU UNIV
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