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Hard carbon composite material, and preparation method and application thereof

A composite material and hard carbon technology, applied in the preparation/purification of carbon, fluorinated carbon, negative electrode, etc., can solve the problems of difficult formation of protective film on the surface of hard carbon, unfavorable battery cycle, high initial irreversible capacity, etc., to achieve cycle Optimizing the balance of life, realizing the effect of capacity and short cycle

Active Publication Date: 2020-11-27
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, the hard carbon surface is not easy to form a protective film, which is not conducive to long-term battery cycles, and is easy to cause high initial irreversible capacity, so some modification of the surface is required

Method used

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  • Hard carbon composite material, and preparation method and application thereof
  • Hard carbon composite material, and preparation method and application thereof
  • Hard carbon composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1g of commercial hard carbon was heat-treated at 1400°C for 3 hours in an argon atmosphere; the heat-treated hard carbon and 2 grams of polyvinylidene fluoride were separately placed in two magnetic boats, and then the magnetic boat was placed in a heat treatment furnace, and then placed in a In an argon atmosphere, heat treatment was performed at 400° C. for 3 hours to obtain a hard carbon composite material. The product is analyzed by XPS, and the surface contains carbon fluoride, see figure 1 .

[0039] The hard carbon composite material prepared in this embodiment is used as the working electrode, the metal sodium is used as the counter electrode, the glass fiber membrane is used as the separator, and NaPF 6 The propylene carbonate (PC) / ethyl methyl carbonate (EMC) solution is used as the electrolyte, and the charge and discharge test is carried out. The charge and discharge curve is as follows figure 2 shown. Constant current charge and discharge test (current ...

Embodiment 2

[0043] 1g of commercial hard carbon was heat-treated at 1200°C for 4 hours in an argon atmosphere; the heat-treated hard carbon and 1 gram of polytetrafluoroethylene were separately placed in two magnetic boats, and then the magnetic boat was placed in a heat treatment furnace, and then placed in a In an argon atmosphere, heat treatment was performed at 450° C. for 2 hours to obtain a hard carbon composite material.

Embodiment 3

[0045] 1g of commercial hard carbon was heat-treated at 1500°C for 2 hours in an argon atmosphere; the heat-treated hard carbon and 1 gram of polyperfluoroethylene propylene were placed in two magnetic boats, and then the magnetic boat was placed in a heat treatment furnace. Then, heat treatment was performed at 500° C. for 1 hour in an argon atmosphere to obtain a hard carbon composite material.

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Abstract

The invention discloses a hard carbon composite material, and a preparation method and application thereof. The composite carbon material disclosed by the invention is of a core-shell structure, consists of a hard carbon material of an inner core and carbon fluoride of an outer shell, and is prepared from commercial hard carbon and a fluorine-containing polymer through simple heat treatment. Whenthe hard carbon composite material is used for the negative electrode of a sodium-ion battery, optimal balance of capacity, coulombic efficiency and cycle life can be realized. The hard carbon composite material is prepared from cheap raw materials by the simple method, and is low in energy consumption, low in cost, short in period and beneficial to large-scale production.

Description

technical field [0001] The invention relates to the technical field of energy storage batteries, in particular to a hard carbon composite material and its preparation method and application. Background technique [0002] With the increasing seriousness of energy and environmental problems around the world, the development of sustainable clean energy, such as solar energy, tidal energy, and wind energy, has received increasing attention, and the effective use of these clean energy depends on high performance, sustainability, low cost and environmental friendliness energy storage battery. On the other hand, with the development of the smart grid, energy storage batteries also play a key role in effectively using the grid. [0003] Currently, common energy storage batteries include lithium-ion batteries, lead-acid batteries, and flow batteries. Lithium-ion batteries have high energy density and long life, but they are expensive and limited by lithium resources, and they also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/587H01M4/62H01M10/054C01B32/05C01B32/10
CPCC01P2004/80C01P2006/40C01B32/05C01B32/10H01M4/366H01M4/5835H01M4/587H01M4/628H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 梅简裘吕超张杰聂建波赵洲峰张江丰谢健孙元坡孙庆峰邹君文徐冬梅罗宏建李小英
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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