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Hard carbon negative electrode material for sodium ion battery based on phenolic resin and its preparation method and application

A sodium-ion battery and carbon negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as limiting the application of graphite, achieve stable cycle performance, adjustable pore size distribution, and good safety performance

Active Publication Date: 2021-05-25
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 thermodynamic reasons, it is difficult for sodium ions with large radius to intercalate into graphite to form stable compounds, thus limiting the application of graphite as a negative electrode material in sodium-ion batteries.

Method used

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  • Hard carbon negative electrode material for sodium ion battery based on phenolic resin and its preparation method and application
  • Hard carbon negative electrode material for sodium ion battery based on phenolic resin and its preparation method and application
  • Hard carbon negative electrode material for sodium ion battery based on phenolic resin and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0047] This example is used to illustrate the preparation method of the hard carbon negative electrode material for sodium ion batteries based on phenolic resin of the present invention.

[0048] figure 1 The preparation method of the sodium ion battery hard carbon negative electrode material based on phenolic resin provided by the embodiment of the present invention, its steps are as follows figure 1 shown, including:

[0049] Step 110, mixing the liquid phenolic resin and ethanol in a volume ratio of 2:1-8:1, and stirring evenly;

[0050] Specifically, the stirring method is preferably mechanical stirring. The time of mechanical stirring can be determined according to the ratio of selected phenolic resin and ethanol. The mixing ratio of liquid phenolic resin and ethanol can be selected in the range of 2:1-8:1 as required.

[0051] Wherein, the phenolic resin includes one or more mixtures of phenol-formaldehyde resin, resorcinol-formaldehyde resin, p-diphenol-formaldehyde...

Embodiment 2

[0063] Mix liquid phenolic resin and ethanol at a volume ratio of 2:1 and stir evenly; transfer the mixture of phenolic resin and ethanol to a reaction kettle, and perform hydrothermal treatment at 180°C for 4 hours to cure the phenolic resin; The resin was taken out and mechanically ground into powder; then the powder was put into a tube furnace, and the temperature was raised to 1550°C at a heating rate of 3°C / min, and the raw material was subjected to high-temperature treatment for 2 hours under the protection of argon to make it Cracking, carbonization; finally cooling to room temperature, taking out the material to obtain a hard carbon material with the following microstructure characteristics.

[0064] Figure 2a The photo of the surface morphology of the cured phenolic resin powder particles prepared for this example shows that fine cracks appear on the surface of the cured phenolic resin, forming holes. Figure 2b The SEM image of the hard carbon material prepared for...

Embodiment 3

[0069] Mix the liquid phenolic resin and ethanol at a volume ratio of 8:1, and stir evenly; transfer the mixture of the phenolic resin and ethanol to a reaction kettle, and perform hydrothermal treatment at 180°C for 4 hours to cure the phenolic resin; The resin was taken out and mechanically ground into powder; then the powder was put into a tube furnace, and the temperature was raised to 1550°C at a heating rate of 3°C / min, and the raw material was subjected to high-temperature treatment for 2 hours under the protection of argon to make it Cracking, carbonization; finally cooling to room temperature, taking out the material to obtain a hard carbon material with the following microstructure characteristics.

[0070] Image 6 The SEM image of the hard carbon material prepared for this example shows that the macroscopic appearance is irregular and massive, and the particle diameter is between 50-200 μm. Its XRD pattern sees Figure 7 . It can be seen from the XRD spectrum th...

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Abstract

The invention discloses a hard carbon negative electrode material for sodium ion battery based on phenolic resin and its preparation method and application. The carbon negative electrode material for sodium ion battery is irregular in macroscopic shape and has a nanoscale microporous structure inside. Hard carbon material; wherein, the typical size of the irregular blocks is 10-200 μm; the pore diameter of the nanoscale microporous structure is less than 2nm; the hard carbon material has microstructural characteristics of short-range order and long-range disorder ; The hard carbon material takes phenolic resin as a precursor, mixes with ethanol in a ratio of 2:1-8:1 by volume, undergoes hydrothermal curing treatment, and then after mechanical pulverization, carbonizes and cracks under the protection of an inert atmosphere The phenolic resin comprises one or more mixtures of phenol-formaldehyde resin, resorcinol-formaldehyde resin, p-diphenol-formaldehyde resin and phenol-furfural resin.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a sodium ion hard carbon negative electrode material based on phenolic resin and its preparation method and application. Background technique [0002] Energy is an indispensable material basis for the development of today's human society. As people's demand for energy continues to increase, the development of low-cost, high-performance energy storage systems is a necessary condition to ensure stable and sustainable energy supply. Secondary batteries represented by lithium-ion batteries have become the most promising energy storage technology due to their high energy density, high energy conversion efficiency, and long cycle life. However, with the increasing scale of electric vehicles and consumer electronics, the scarcity and uneven spatial distribution of lithium resources limit the application of lithium-ion batteries in the field of large-scale energy storage. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M10/054
CPCY02E60/10
Inventor 胡勇胜孟庆施陆雅翔陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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