Phenolic resin/coal tar pitch composite-base modified hard carbon negative electrode material and preparation method and application thereof

A technology of phenolic resin and negative electrode material, which is applied in the field of electrochemistry, can solve the problems of solvent ion co-embedding structure, destruction, poor compatibility, etc., and achieve the effect of good electrochemical performance, broad research prospects, and improved rate performance

Inactive Publication Date: 2016-02-03
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to its layered structure, graphite-based anode materials have poor compatibility with electrolytes, and are prone to co-intercalation of solvent ions during charge and discharge, causing structural damage, which affects the cycle stability and Coulombic efficiency of graphite anode materials. , especially reduces the rate performance of graphite anode materials, and cannot meet the continuous high-current discharge capability required by large-scale power batteries, etc.

Method used

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  • Phenolic resin/coal tar pitch composite-base modified hard carbon negative electrode material and preparation method and application thereof
  • Phenolic resin/coal tar pitch composite-base modified hard carbon negative electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 100g of phenolic resin, stir and dissolve it in 150mL of absolute ethanol, add 10g of phosphoric acid, and stir for 3 hours to completely dissolve the phenolic resin. In a 500mL beaker, add 50g of coal tar pitch, add washing oil, and dissolve it completely at 180°C, add the above-mentioned modified phenolic resin anhydrous ethanol solution, continue stirring, and pour the self-sealing bag, put into 60°C oven for pre-curing for 10h.

[0032] The pre-cured sample was put into a tube furnace, and carbonized at 800°C for 3h at a heating rate of 3°C / min under an argon atmosphere. The carbonized sample was milled in a ball mill at 400r / min for 10h. Then pass through a 400-mesh sieve to obtain the phenolic resin / coal tar pitch composite base modified hard carbon negative electrode material.

Embodiment 2

[0034] Weigh 100g of phenolic resin, stir and dissolve it in 150mL of absolute ethanol, add 20g of phosphoric acid, and stir for 3 hours to completely dissolve the phenolic resin. In a 500mL beaker, add 100g of coal tar pitch, add washing oil, and dissolve it completely at 180°C, add the above-mentioned modified phenolic resin anhydrous ethanol solution, continue stirring, and pour the self-sealing bag, put into a 60°C oven for pre-curing for 8 hours.

[0035] The pre-cured sample was placed in a tube furnace, and carbonized at 1000°C for 3h at a heating rate of 5°C / min in an argon atmosphere. The carbonized sample was milled in a ball mill at 400r / min for 10h. Then pass through a 400-mesh sieve to obtain the phenolic resin / coal tar pitch composite base modified hard carbon negative electrode material.

Embodiment 3

[0037] Weigh 100g of phenolic resin, stir and dissolve it in 150mL of absolute ethanol, add 20g of phosphoric acid, and stir for 3 hours to completely dissolve the phenolic resin. In a 500mL beaker, add 150g of coal tar pitch, add washing oil, and dissolve it completely at 180°C, add the modified phenolic resin anhydrous ethanol solution prepared above, continue to stir, and pour the self-sealing bag, put into a 60°C oven for pre-curing for 12h.

[0038] The pre-cured sample was placed in a tube furnace, and carbonized at 1200°C for 5h at a heating rate of 5°C / min under an argon atmosphere. The carbonized sample was milled in a ball mill at 600r / min for 6h. Then pass through a 400-mesh sieve to obtain the phenolic resin / coal tar pitch composite base modified hard carbon negative electrode material.

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Abstract

The invention discloses a phenolic resin/coal tar pitch composite-base modified hard carbon negative electrode material and a preparation method and application thereof, and belongs to the field of electrochemistry. According to the phenolic resin/coal tar pitch composite-base modified hard carbon negative electrode material, phenolic resin and coal tar pitch serve as hard carbon precursors, and the mass ratio of the phenolic resin to the coal tar pitch is 2:1-4. The phenolic resin is modified through phosphoric acid, and the mass ratio of the phosphoric acid to the phenolic resin is 1-5:10. The particle size range of the hard carbon negative electrode material is 10-50 microns. The primary coulombic efficiency of the negative electrode material under the 0.5 C multiplying power is 80.55%, under the 2 C multiplying power, the volume is kept to be about 221 mAh/g after recycling is conducted 300 times, the volume does not greatly differ from the volume under the 0.5 C multiplying power and the 1 C multiplying power, and it shows that good volume maintaining performance and coulombic efficiency are achieved.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a phenolic resin / coal tar pitch composite base modified hard carbon negative electrode material, a preparation method and application thereof. Background technique [0002] Graphite carbon anode materials have the advantages of low electrode potential, long cycle life, good safety and low price, and have become the main anode materials for commercial lithium-ion batteries. [0003] However, due to its layered structure, graphite-based anode materials have poor compatibility with electrolytes, and are prone to co-intercalation of solvent ions during charge and discharge, causing structural damage, which affects the cycle stability and Coulombic efficiency of graphite anode materials. , especially reduces the rate performance of graphite anode materials, and cannot meet the continuous high-current discharge capability required by large-scale power batteries. [0004] Compared with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/583H01M4/62H01M10/0525
CPCY02E60/10
Inventor 石永倩唐其伟王瑛王胜伟赵成龙高洪森宋楠楠于恒杰田崇社马运法
Owner SHANDONG YUHUANG NEW ENERGY TECH
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