Composite graphene electrode material and solid-phase catalysis preparation method thereof

A graphene composite and electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of inability to achieve complete and uniform coating of LiFePO4, unsatisfactory combination of electrode materials and graphene, and difficulty in complete coating of graphene, etc. problems, to achieve excellent electrochemical performance, good batch stability, and uniform thickness

Inactive Publication Date: 2013-11-06
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this simple mechanical mixing method makes it difficult to completely coat the material with graphene, and serious agglomeration of graphene itself will occur during the mixing process.
Application No. 201110079630.9 discloses a nanometer metal oxide/graphene doped LiFePO 4 The preparation method of electrode material is to modify graphene by nanometer metal oxide to solve the problem of graphene in contact with LiFePO 4 In order to solve the problem of easy agglomeration in the composite process, this method still adopts the method of mechanical ball milling and

Method used

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  • Composite graphene electrode material and solid-phase catalysis preparation method thereof
  • Composite graphene electrode material and solid-phase catalysis preparation method thereof
  • Composite graphene electrode material and solid-phase catalysis preparation method thereof

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Embodiment 1

[0038] LiFePO with olivine structure 4 (Li-ion battery electrode material), glucose (organic carbon source), FeSO 4 (Catalyst precursor) was thoroughly mixed according to the ratio of 200:1:15, and then in Ar / H 2 (95:5) In a reducing atmosphere composed of an inert mixed gas, heat treatment at a reaction temperature of 700°C in a closed tube furnace for 10 hours, then naturally cool to room temperature, grind finely, and sieve to obtain LiFePO 4 / Graphene composite electrode material (as anode material). combine Figure 1 ~ Figure 3 As shown, it can be known that LiFePO 4 The graphene tight coating layer of the electrode active material outer layer of the graphene composite electrode material is uniform and thin, with a thickness of 2.5nm, and the graphene conductive network will LiFePO 4 The effective connection between the particles of the middle electrode active material makes LiFePO 4 The electrochemical performance of the / graphene composite electrode material is sig...

Embodiment 2

[0040] LiFePO with olivine structure 4 (electrode material for lithium-ion batteries), sucrose (organic carbon source), NiSO 4 (Catalyst precursor) was thoroughly mixed according to the ratio of 200:1:15, and then in Ar / H 2 (95:5) In a reducing atmosphere composed of an inert mixed gas, heat treatment at a reaction temperature of 750°C in a closed tube furnace for 10 hours, then naturally cool to room temperature, grind finely, and sieve to obtain LiFePO 4 / Graphene composite electrode material (as anode material).

Embodiment 3

[0042] LiFePO with olivine structure 4 (electrode material for lithium-ion batteries), glucose (organic carbon source), CoCl 2 (Catalyst precursor) was thoroughly mixed according to the ratio of 200:2:20, and then in Ar / H 2 (95:5) In a reducing atmosphere composed of an inert mixed gas, heat treatment in a closed tube furnace at a reaction temperature of 700°C for 8 hours, then naturally cool to room temperature, grind finely, and sieve to obtain LiFePO 4 / Graphene composite electrode material (as anode material).

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Abstract

The invention discloses a composite graphene electrode material. The material comprises an electrode material body and is characterized in that a graphene coating structure grows on the surface of the electrode material body in situ. The graphene coating structure is composed of a graphene close coating layer which is located on an electrode active material surface and a peripheral graphene conductive network and can improve the electrical conductivity of particles of the electrode material and the conductive connection among the particles. The invention also discloses a solid-phase catalysis preparation method for the composite graphene electrode material. The method comprises the steps of 1) mixing electrode materials, organic carbon source and catalyst precursors fully and uniformly as per the ratio of 200:(1-5):(5-30); 2) performing heat treatment on the mixture obtained through Step 1) in reducing atmosphere at 400-1000DEG C for 1-24 hours; 3) naturally cooling the mixture to the room temperature, performing porphyrizing and sieving, and finally obtaining the composite graphene electrode material. The method has the advantages of being low in cost and easy to implement and popularize.

Description

technical field [0001] The invention relates to a graphene composite electrode material and a solid-phase catalytic preparation method thereof. Background technique [0002] Due to the advantages of high energy density, lithium-ion batteries have been developed rapidly in the past 20 years, and are widely used as power sources for portable electronic products such as mobile phones, cameras, and notebook computers. In recent years, the development of hybrid electric vehicles, plug-in hybrid electric vehicles and large-scale energy storage equipment has put forward higher requirements for the next-generation lithium-ion batteries in terms of energy density, rate performance and cycle life. Although the performance of a large number of new materials as electrode materials for lithium-ion batteries has been exhaustively studied, only a few materials have been commercialized so far. [0003] Under the existing conditions, there are two main ways to improve the energy density, ra...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583
CPCY02E60/12Y02E60/10
Inventor 张力李靖郑洪河
Owner SUZHOU UNIV
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