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A kind of phenolic resin/sucrose-based hard carbon microsphere material and its preparation method and sodium ion battery

A technology of phenolic resin and sucrose, which is applied in the field of phenolic resin/sucrose-based hard carbon microsphere materials and its preparation method and sodium ion batteries, can solve the problems of unsatisfactory practical application, fast capacity decay, and low initial coulombic efficiency, and achieve Conducive to intercalation/extraction and rapid migration, large layer spacing, and short ion diffusion paths

Active Publication Date: 2022-03-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Sucrose and phenolic resin are two common hard carbon precursors. Hard carbon materials prepared by direct pyrolysis are used as anodes for sodium-ion batteries. The capacity decays quickly and the first Coulombic efficiency is low, which cannot meet practical applications.

Method used

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  • A kind of phenolic resin/sucrose-based hard carbon microsphere material and its preparation method and sodium ion battery
  • A kind of phenolic resin/sucrose-based hard carbon microsphere material and its preparation method and sodium ion battery
  • A kind of phenolic resin/sucrose-based hard carbon microsphere material and its preparation method and sodium ion battery

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preparation example Construction

[0029] The invention provides a method for preparing a phenolic resin / sucrose-based hard carbon microsphere material, comprising the following steps:

[0030] (1) mixing phenolic resin, sucrose and solvent to carry out solvothermal reaction to obtain a cross-linked product;

[0031] (2) Subjecting the cross-linked product obtained in the step (1) to high-temperature carbonization treatment to obtain a phenolic resin / sucrose-based hard carbon microsphere material.

[0032] The invention mixes phenolic resin, sucrose and solvent to carry out solvothermal reaction to obtain a cross-linked product.

[0033] In the present invention, the phenolic resin is preferably an alcohol-soluble thermoplastic phenolic resin, more preferably at least one of phenol-formaldehyde resin, resorcinol-formaldehyde resin, hydroquinone-formaldehyde resin and phenol-furfural resin . In the present invention, the above-mentioned common alcohol-soluble thermoplastic phenolic resin is used as a hard carb...

Embodiment 1

[0051] Preparation of phenolic resin / sucrose-based hard carbon microspheres:

[0052] Dissolve 10g of phenol-formaldehyde resin in 80mL of absolute ethanol to form a solution with a concentration of 0.125g / mL, and stir for 0.5h; dissolve 10g of sucrose in 80mL of deionized water to form a solution with a concentration of 0.125g / mL, and stir for 0.5 h; add the sucrose solution into the phenolic resin solution, stir for 1 h until the solution is uniform; transfer the mixture solution to the reaction kettle, and perform a solvothermal reaction at 180 ° C for 8 h; Each was washed 3 times, and then dried in an oven at 100°C for 12 hours to obtain a solid powder; the powder was put into a tube furnace, protected by inert gas argon, and heated at a heating rate of 5°C / min to 1000° C., and carbonization treatment was carried out at 1000° C. for 2 hours to obtain phenolic resin / sucrose-based hard carbon microspheres. (The mass ratio of raw material phenol-formaldehyde resin to sucrose...

Embodiment 2

[0058] Dissolve 10g of phenol-formaldehyde resin in 80mL of absolute ethanol to form a solution with a concentration of 0.125g / mL, and stir for 0.5h; dissolve 10g of sucrose in 80mL of deionized water to form a solution with a concentration of 0.125g / mL, and stir for 0.5 h; add the sucrose solution into the phenolic resin solution, and stir for 1 hour until the solution is uniform; transfer the mixture solution to a reaction kettle, and conduct a hydrothermal reaction at 180°C for 8 hours; use deionized water and absolute ethanol to prepare the products after the hydrothermal reaction, respectively. Wash 3 times, and then dry in an oven at 100°C for 12 hours to obtain a solid powder; put the powder into a tube furnace, pass through the inert gas argon protection, and raise the temperature to 1400°C at a heating rate of 5°C / min. Carry out carbonization treatment at 1400° C. for 2 hours to obtain phenolic resin / sucrose-based hard carbon microspheres. (The mass ratio of raw mater...

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Abstract

The invention relates to the technical field of sodium ion batteries, and provides a method for preparing a phenolic resin / sucrose-based hard carbon microsphere material. In the present invention, phenolic resin, sucrose and solvent are mixed for solvothermal reaction, and the abundant functional groups of sucrose and phenolic resin are utilized. The unsaturated groups in the unsaturated groups undergo a crosslinking reaction, and the product slowly crystallizes to obtain spherical particles with a smooth surface. After high-temperature carbonization treatment, a hard carbon material with a spherical structure is obtained, which has the advantage of a shorter ion diffusion path and a larger layer. The spacing is conducive to the intercalation / extraction and fast migration of ions, resulting in excellent electrochemical sodium storage performance. Experimental results show that the hard carbon material provided by the present invention maintains a high initial coulombic efficiency and cycle stability as a negative electrode of a sodium ion battery, and at the same time has a high reversible capacity.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a phenolic resin / sucrose-based hard carbon microsphere material, a preparation method thereof, and a sodium ion battery. Background technique [0002] Na has the advantages of similar properties to lithium, abundant reserves, low cost and high potential safety, so sodium-ion batteries have great development prospects in large-scale energy storage applications. Hard carbon materials have a macroscopic non-graphite structure with large interlayer spacing, and at the same time, the microstructure is disordered and graphitization is not easy to occur. Hard carbon precursors are rich in sources, including resins (epoxy resins, phenolic resins, etc.), polymers, biomass, etc. Hard carbon, as an electrode material for sodium-ion batteries, has a high low-voltage platform capacity and is the most promising for sodium-ion batteries. One of the negative electrode materials wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/054
CPCC01B32/05H01M4/587H01M10/054Y02E60/10
Inventor 徐斌徐冉孙宁常夏青
Owner BEIJING UNIV OF CHEM TECH