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Preparation method and application of heteroatom modified composite negative electrode material

A negative electrode material and heteroatom technology, which is applied in the field of preparation of heteroatom modified composite negative electrode materials, can solve the problems of fewer synthesis steps and complexity, and achieve the effects of large current discharge capacity, increased capacity, and high initial charge and discharge efficiency

Pending Publication Date: 2022-02-01
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the synthesis of co-doped microporous carbon materials and most of the synthesis steps are complex, so more simple and effective preparation methods need to be further explored.

Method used

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  • Preparation method and application of heteroatom modified composite negative electrode material
  • Preparation method and application of heteroatom modified composite negative electrode material
  • Preparation method and application of heteroatom modified composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a heteroatom-modified composite negative electrode material, specifically comprising the following steps:

[0038] 1) Precursor preparation: Weigh 8.3g of polytetrafluoroethylene, 24.9g of soft carbon, and 49.8g of hard carbon, mix them, fully melt and stir the above mixture at 300°C for 2 hours, cool it at room temperature, and then crush it into In granular form, a precursor with a particle size of about 4 μm is obtained;

[0039] 2) Chemical vapor deposition: place the precursor in the temperature zone of the CVD tube furnace near the gas outlet, place urea in the temperature zone of the CVD tube furnace close to the gas inlet, and vacuumize the CVD quartz tube after placing it After reaching below 5Pa, the carrier gas argon is introduced at a flow rate of 145 sccm / min, and then the precursor temperature zone is heated, and the nitrogen source temperature zone is heated after approaching 300°C; when the temperature on one side of the nitrogen s...

Embodiment 2

[0041] A method for preparing a heteroatom-modified composite negative electrode material, specifically comprising the following steps:

[0042] 1) Precursor preparation: Weigh 9.1g of polytetrafluoroethylene, 31.85g of soft carbon, and 50.05g of hard carbon, mix them, fully melt and stir the above mixture at 300°C for 2 hours, cool it at room temperature, and then crush it into In granular form, a precursor with a particle size of about 4 μm is obtained;

[0043] 2) Chemical vapor deposition: place the precursor in the temperature zone of the CVD tube furnace near the gas outlet, place the urea in the temperature zone of the CVD tube furnace close to the gas inlet, and vacuumize the CVD quartz tube after placement to achieve After the flow rate is below 5Pa, the carrier gas argon is introduced at a flow rate of 145 sccm / min, and then the temperature zone of the precursor is heated, and the temperature zone of the nitrogen source is heated after approaching 300°C; when the tem...

Embodiment 3

[0045] A method for preparing a heteroatom-modified composite negative electrode material, specifically comprising the following steps:

[0046] 1) Precursor preparation: Weigh 8.3g of polyvinylidene fluoride, 33.2g of soft carbon, and 41.5g of hard carbon, mix them, fully melt and stir the above mixture at 300°C for 2 hours, cool it at room temperature, and then crush it into particles in a jet mill Shape, to obtain a precursor with a particle size of about 4 μm;

[0047]2) Chemical vapor deposition: place the precursor in the temperature zone of the CVD tube furnace near the gas outlet, place urea in the temperature zone of the CVD tube furnace close to the gas inlet, and vacuumize the CVD quartz tube after placing it , after reaching below 5Pa, the carrier gas argon is introduced at a flow rate of 145 sccm / min, and then the precursor temperature zone is heated, and the nitrogen source temperature zone is heated when it is close to 350°C. When the temperature of one side of ...

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Abstract

The invention belongs to the field of high-power lithium ion capacitors, and particularly relates to a preparation method and application of a heteroatom modified composite negative electrode material. The method comprises the steps that soft carbon, hard carbon and a heteroatom modifier are subjected to high-temperature ball milling and mixed to be uniform, a precursor is obtained, then the heteroatom modified composite negative electrode material is prepared through a chemical vapor deposition method, in the preparation process, urea or melamine is adopted as a nitrogen source and reacts with a precursor at a proper CVD temperature to complete preparation of the fluorine and nitrogen heteroatom co-doped composite negative electrode material. The method is simple in preparation process, easy to operate and low in cost, and the prepared composite negative electrode material has excellent electrochemical activity and stable product performance, and is applied to the field of ultra-high power lithium ion capacitors.

Description

technical field [0001] The invention belongs to the field of high-power lithium ion capacitors, and in particular relates to a preparation method and application of a heteroatom-modified composite negative electrode material. Background technique [0002] As a new type of energy storage device, lithium ion capacitor has the advantages of high power density, high electrostatic capacity and long cycle life, and is expected to be widely used in new energy vehicles, solar energy, wind energy and other fields. [0003] Since lithium-ion capacitors have the characteristics of high power density and high energy density, higher requirements are placed on the high-current discharge capability of their negative electrode materials. The traditional graphite anode material has a highly oriented layered structure due to its high degree of graphitization, but the compatibility between graphite and electrolyte is poor, and solvent ion co-intercalation is prone to occur during charge and di...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525H01G11/30H01G11/38H01G11/50H01G11/86
CPCH01M4/362H01M4/583H01M4/388H01M4/38H01M10/0525H01G11/38H01G11/50H01G11/30H01G11/86H01M2004/027Y02E60/10Y02E60/13
Inventor 刘江涛周雄陈晓涛刘富亮石斌
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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