Heteroatom doped graphene coated composite electrode material and preparation method thereof

A graphene-coated, composite electrode technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve problems such as difficulty in greatly improving battery electrochemical performance, cumbersome preparation process, and limited battery performance improvement, and achieve protection from corrosion. , the effect of enhancing interaction and improving wettability

Inactive Publication Date: 2017-09-29
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] At present, the application of graphene in battery cathode materials is simply dispersed coating, which is difficult to greatly improve the electrochemical performance of the battery; and the doped graphene currently used in the modification of lithium-ion battery cathode materials is only nitrogen-doped. Doped graphene, this kind of doped graphene has limited performance improvement of the battery, and the preparation method is roughly: mix g

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  • Heteroatom doped graphene coated composite electrode material and preparation method thereof

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Embodiment 1

[0056] This embodiment provides a composite positive electrode material coated with boron-doped graphene, the composite positive electrode material includes a positive electrode material and boron-doped graphene coated on the surface of the positive electrode material;

[0057] Among them, the positive electrode material is lithium iron phosphate;

[0058] In boron-doped graphene, the doping amount of boron is 1mol%;

[0059] In the composite positive electrode material, the percentage of boron-doped graphene in the total mass of the composite positive electrode material is 2wt%.

[0060] Preparation:

[0061] (1) Put lithium iron phosphate and platinum into a three-dimensional mixer, perform three-dimensional mixing, and the mixing time is 4 hours to obtain a mixed precursor, wherein the mass of platinum accounts for 1 wt% of the total mass of the mixed precursor;

[0062] (2) Place the mixed precursor in the rotary furnace, feed high-purity argon gas, and remove the air in...

Embodiment 2

[0065] This embodiment provides a composite positive electrode material coated with boron-doped graphene, the composite positive electrode material includes a positive electrode material and boron-doped graphene coated on the surface of the positive electrode material;

[0066] Among them, the positive electrode material is lithium manganese phosphate;

[0067] In boron-doped graphene, the doping amount of boron is 1mol%;

[0068] In the composite positive electrode material, the percentage of boron-doped graphene in the total mass of the composite positive electrode material is 5 wt%.

[0069] Preparation:

[0070](1) Put lithium manganese phosphate and copper into a ball mill tank and perform ball milling for 6 hours to obtain a mixed precursor, wherein the mass of copper accounts for 0.5wt% of the total mass of the mixed precursor;

[0071] (2) Place the mixed precursor in the rotary furnace, feed high-purity nitrogen, and get rid of the air in the rotary furnace;

[007...

Embodiment 3

[0074] This embodiment provides a composite positive electrode material coated with phosphorus-doped graphene, the composite positive electrode material includes a positive electrode material and phosphorus-doped graphene coated on the surface of the positive electrode material;

[0075] Among them, the positive electrode material is lithium manganese iron phosphate;

[0076] In phosphorus-doped graphene, the doping amount of phosphorus is 1mol%;

[0077] In the composite positive electrode material, the percentage of phosphorus-doped graphene to the total mass of the composite positive electrode material is 5 wt%.

[0078] Preparation:

[0079] (1) Put lithium manganese iron phosphate and nickel into a three-dimensional mixer, perform three-dimensional mixing, and the mixing time is 2 hours to obtain a mixed precursor, wherein the mass of nickel accounts for 0.7wt% of the total mass of the mixed precursor;

[0080] (2) Place the mixed precursor in the rotary furnace, feed h...

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Abstract

The invention discloses a heteroatom doped graphene coated composite electrode material and a preparation method thereof, firstly an electrode material and a catalyst are mixed to obtain a mixed precursor for catalytic chemical vapor deposition in the presence of both a compound containing a carbon source and a compound containing a doping source to obtain the heteroatom doped graphene coated composite electrode material. The composite electrode material comprises the electrode material and doped graphene coating the surface of the electrode material, and the doped atom is any one or a combination of at least two of boron, sulfur or phosphorus, in the heteroatom doped graphene coated composite electrode material, a heteroatom doped graphene coating layer has good uniformity and less lamination, the heteroatom doped graphene coating layer is uniformly and tightly combined with an electrode material matrix, is not easy to fall off, not easy to agglomerate and wrinkle, and conducive to improvement of the performance of electrical contact with the electrode material matrix, can protect the surface of the electrode material from erosion, can significantly improve the properties of the electrode material, and enhances the electrical conductivity and the cycle life of the electrode material.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode materials, and relates to a heteroatom-doped graphene-coated composite electrode material and a preparation method thereof, in particular to a heteroatom-doped graphene-coated composite electrode material and its use of catalytic chemistry. Catalytic Chemical Vapor Deposition (CCVD) realizes the in-situ growth of heteroatom-doped graphene and coats the surface of electrode materials to prepare composite electrode materials. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have many advantages, such as high operating voltage, high energy density, high power density, long cycle life, low self-discharge rate, no memory effect, and environmental friendliness. Therefore, since the commercial application of lithium-ion batteries in the 1990s, they have been widely used in digital 3C products, electronic medical instruments, aerospace and mili...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/04
CPCH01M4/0428H01M4/362H01M4/5825H01M4/625Y02E60/10
Inventor 卢吉明王张健崔伟超杨顺毅庞钧友
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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