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Carbon composite material for secondary battery, preparation method thereof and application thereof

A carbon composite material and battery technology, applied in the direction of electrode carrier/current collector, etc., can solve the problems of low conductivity, inability to prevent graphite pulverization, low coulomb efficiency, etc., to improve energy density, avoid structural and performance shortcomings, improve The effect of comprehensive performance

Inactive Publication Date: 2019-06-28
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the need to consider the compatibility of the electrolyte with the battery cathode and anode materials, carbon-based materials that have been widely used in lithium-ion batteries and sodium-ion batteries have encountered many problems when they are used in secondary batteries with metal deposition.
For example, the ether electrolyte has good compatibility with lithium metal, but since the ether electrolyte cannot form an effective solid electrolyte interface (SEI) film on the graphite surface, it cannot prevent solvent molecules from co-intercalating into the graphite lattice, resulting in Graphite pulverization
Although pure hard carbon materials will not be pulverized due to solvent co-intercalation, there are problems such as low Coulombic efficiency, low electrical conductivity, and battery polarization.

Method used

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  • Carbon composite material for secondary battery, preparation method thereof and application thereof
  • Carbon composite material for secondary battery, preparation method thereof and application thereof
  • Carbon composite material for secondary battery, preparation method thereof and application thereof

Examples

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Embodiment 1

[0090] This example is used to illustrate the carbon composite material of the present invention and its preparation method and application.

[0091] 1. Preparation of carbon composite materials for lithium secondary batteries

[0092] 2g of polyacrylonitrile (PAN) was dissolved in 20mL of dimethylformamide (DMF), PAN was slowly added to DMF and stirred for 1 hour, and the uniformly dissolved solution was made into fibers using electrospinning technology, and then the spun The silk product was pre-fired in a muffle furnace at 280°C for 2 hours, and then fired in a tube furnace at 800°C for 6 hours under an argon (Ar) atmosphere. The resulting carbon composites are figure 1 shown.

[0093] Such as figure 2 As shown, the morphology of the prepared carbon composite is carbon fiber, and its specific surface area is 82.89m 2 / g, the pore size range is 10-500nm, and the porosity is 82%. Utilize Raman spectrum to test the carbon material that embodiment 1 obtains, the result is a...

Embodiment 2

[0103] This example is used to illustrate the carbon composite material of the present invention and its preparation method and application.

[0104] 1. Preparation of carbon composite materials for lithium secondary batteries

[0105] 1.8g PAN and 0.2g pitch were dissolved in 20mL DMF, PAN and pitch were slowly added to DMF and stirred for 1 hour, the uniformly dissolved solution was made into nanowires using electrospinning technology, and then the spinning product was Pre-fire in a Furnace at 280°C for 2 hours, then burn in a tube furnace at 800°C for 6 hours under an argon atmosphere, and use it after cooling to room temperature.

[0106] Such as Figure 5 As shown, the morphology of the prepared carbon composite material is carbon nanowires, and its specific surface area is 86.89m 2 / g, the pore size range is 5-500nm, and the porosity is 83%. Utilize Raman spectrometer to test the carbon material that embodiment 2 obtains, the result is as follows Figure 6 As shown, ...

Embodiment 3

[0111] This example is used to illustrate the carbon composite material of the present invention and its preparation method and use.

[0112] 1. Preparation of carbon composites for sodium secondary batteries

[0113] The gelatin and pitch were mechanically mixed at a mass ratio of 1:1, and the resulting mixture was pyrolyzed in a tube furnace at 800°C for 6 hours under an argon atmosphere, and a carbon composite material containing nitrogen was obtained after natural cooling.

[0114] Such as Figure 7 As shown, the morphology of the prepared carbon composite is porous carbon, and its specific surface area is 553.62m 2 / g, the pore size range is 1-100nm, and the porosity is 67%. Raman test results show that the obtained carbon material is a composite material of soft carbon and hard carbon, and photoelectron spectroscopy results show that the obtained carbon material is a nitrogen-rich carbon material.

[0115] 2. Preparation and electrochemical test of sodium secondary ba...

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Abstract

The invention provides a carbon composite material, a preparation method thereof and an application thereof. The carbon composite material is composed of soft carbon and hard carbon. When the carbon composite material provided by the invention is used as a negative electrode current collector of a secondary battery, the advantages of the soft carbon and the hard carbon can be complemented, electrochemically active substances can be uniformly embedded, adsorbed or deposited in the carbon composite material, the destruction of the structures of the carbon material and the short circuit of the battery do not occur, and at the same time, the performance of a metal secondary battery can be improved. The carbon composite material not only provides space for metal deposition but also provides a space or passage for metal ion insertion, adsorption and extraction, and the storage capacity and cycle life of the secondary battery are improved. When the carbon composite material provided by the present invention is used as the negative electrode current collector of the secondary battery, the change of the original assembly process of the battery is not needed.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a hard carbon-soft carbon composite material for metal secondary batteries, a preparation method and application thereof. Background technique [0002] With the development of portable electronic devices and electric vehicles, people's demand for high energy density energy storage devices is increasing. Therefore, it is imminent to develop new battery electrode materials with high specific capacity, high rate, and high safety. Carbon materials have become the preferred materials for high energy density battery anodes due to their stable structure, low cost and easy availability. At present, carbon materials such as graphite, soft carbon, and hard carbon have been used in lithium-ion batteries, and some hard carbon materials are also used in sodium-ion batteries. However, due to the need to consider the compatibility of the electrolyte with the battery cathode and anode mater...

Claims

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Application Information

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IPC IPC(8): H01M4/66
CPCY02E60/10
Inventor 杨高靖王兆翔陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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