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Hard carbon-metal oxide-soft carbon composite material and preparation method and application thereof

A composite material and oxide technology, applied in the field of hard carbon-metal oxide-soft carbon composite material and its preparation, can solve the problems of large-scale application limitation, first irreversibility, high electrode potential, and achieve high first charge and discharge Coulomb efficiency , low cost, small specific surface area

Active Publication Date: 2017-10-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Hard carbon is pyrolytic carbon of high molecular polymer, which is difficult to be graphitized. It has an interlaced layered structure, so that sodium ions can be embedded and extracted from various angles, thus greatly improving the speed of charge and discharge; and graphite Compared with other materials, its low-temperature performance has also been significantly improved, and hard carbon materials generally have a high reversible specific capacity, but hard carbon materials also often have disadvantages such as high electrode potential, potential hysteresis, irreversibility for the first time, and large capacity. Large-scale application is limited

Method used

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  • Hard carbon-metal oxide-soft carbon composite material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Put the aqueous glucose solution with a concentration of 0.5M into the reactor and put it in the oven, control the temperature of the oven at 180°C, and the hydrothermal reaction time is 8h;

[0025] 2) washing the reactant obtained in step 1) with deionized water, suction filtering 3 times until the pH is neutral, and drying at 80-120°C for ≥24 hours to obtain a hard carbon precursor material;

[0026] 3) Add the hard carbon precursor and tetrabutyl titanate into ethanol-water solution (the volume ratio of ethanol and deionized water is 3:7) and stir for 4 hours. After the tetrabutyl titanate is fully hydrolyzed, filter and dry to obtain the pre- Coated hard carbon precursor;

[0027] 4) Put the crucible with asphalt into a muffle furnace at 220°C for 22 hours, and obtain a soft carbon precursor after the light components in the asphalt are decomposed;

[0028] 5) The two precursor products obtained in step 3) and step 4) are fully mixed through a planetary ball mi...

Embodiment 2

[0030] 1) Add glucose aqueous solution with a concentration of 0.5M into the reactor and place it in an oven, control the temperature of the oven at 100°C, and the hydrothermal reaction time is 16 hours;

[0031] 2) washing the reactant obtained in step 1) with deionized water, suction filtering 3 times until the pH is neutral, and drying at 80-120°C for ≥24 hours to obtain a hard carbon precursor material;

[0032] 3) Add the hard carbon precursor and titanium isopropoxide into an ethylene glycol-water solution (the volume ratio of ethylene glycol and deionized water is 3:7) and stir for 4 hours. After the titanium isopropoxide is fully hydrolyzed, it is filtered and dried to obtain Pre-coated hard carbon precursor;

[0033] 4) Put the crucible with asphalt into a muffle furnace at 220°C for 22 hours, and obtain a soft carbon precursor after the light components in the asphalt are decomposed;

[0034] 5) The two precursor products obtained in step 3) and step 4) are fully mi...

Embodiment 3

[0036] 1) Put the 0.6M sucrose aqueous solution into the reactor and put it in the oven, control the oven temperature at 180°C, and the hydrothermal reaction time is 10h;

[0037] 2) Wash the reactant obtained in step 1) with deionized water and filter it three times until the pH is neutral, and dry it at 80-120°C for ≥24 hours to obtain a hard carbon precursor material;

[0038] 3) Add the hard carbon precursor and tetrabutyl titanate into propylene glycol-water solution (the volume ratio of propylene glycol and deionized water is 3:7) and stir for 4 hours. After the tetrabutyl titanate is fully hydrolyzed, it is filtered and dried to obtain the pre- Coated hard carbon precursor;

[0039] 4) Put the crucible with asphalt into a muffle furnace at 220°C for 22 hours, and obtain a soft carbon precursor after the light components in the asphalt are decomposed;

[0040] 5) The two precursor products obtained in step 3) and step 4) are fully mixed through a planetary ball mill, wh...

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Abstract

The invention discloses a hard carbon-metal oxide-soft carbon composite material and a preparation method and application thereof. The preparation method comprises the steps of firstly, performing a hydrothermal method on hydrocarbon in a reaction kettle to prepare a hard carbon precursor; secondly, pre-coating the hard carbon precursor and a titanium salt, placing asphalt in a muffle furnace for low-temperature pyrolysis reaction to obtain a soft carbon precursor; and finally, fully mixing the pre-coated hard carbon precursor and the soft carbon precursor, and performing high-temperature pyrolysis reaction under protection of an inert gas to obtain the product, wherein the product is the hard carbon-metal oxide-soft carbon composite material. The material can be used as a negative active material of a sodium ion battery. The preparation method is wide in raw material source and low in cost, and the prepared hard carbon-metal oxide-soft carbon composite material has the advantages of large reversible capacity, high initial charge-discharge coulombic efficiency, good cycle property and the like in the sodium ion battery.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a hard carbon-metal oxide-soft carbon composite material and its preparation method and application. Background technique [0002] Compared with traditional secondary batteries such as lead-acid batteries and nickel-cadmium batteries, lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life and environmental friendliness, thus attracting the attention of more and more researchers. . However, the global lithium resources are not rich, and the abundance of lithium in the earth's crust is only 0.006%. The problem of resources and price has become a worry for large-scale applications in the future. It is urgent to develop a new system of next-generation energy storage batteries with excellent comprehensive performance. Compared with lithium resources, sodium reserves are extremely abundant, the content in the earth's crust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/48H01M10/054
CPCH01M4/366H01M4/483H01M4/583H01M10/054Y02E60/10
Inventor 王涂亮包婷婷梁大宇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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