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A kind of lignin porous carbon with uniform pores and its preparation method and application in lithium ion battery negative electrode material

A technology of lignin and porous carbon, which is used in battery electrodes, carbon preparation/purification, circuits, etc., can solve the problems affecting lithium ion transmission and extraction/insertion, uneven pore size distribution, and uneven pore structure. The effect of uniform size, saving resources and protecting the environment

Active Publication Date: 2020-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the agglomeration of silica nanoparticles and the shrinkage and collapse of carbon sources such as glucose and petroleum pitch in the carbonization process, the pore size distribution of carbon materials is not uniform, and there are many micropores and Small pores, to a certain extent, affect lithium ion transport and extraction / intercalation
[0007] Compared with existing synthetic polymers or low molecular weight polymers, alkali lignin molecules derived from paper pulping contain a large number of carboxyl groups and hydroxyl groups, but their water solubility is poor, and there is a π-π bond stacking effect in aqueous solution However, it is in a highly aggregated state, resulting in weak interaction between it and silica nanomaterials
Silica itself is very easy to agglomerate in lignin due to the hydrogen bonding of the hydroxyl groups on the surface, and the pore structure of the prepared lignin porous carbon is not uniform, which affects its electrochemical performance.

Method used

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  • A kind of lignin porous carbon with uniform pores and its preparation method and application in lithium ion battery negative electrode material
  • A kind of lignin porous carbon with uniform pores and its preparation method and application in lithium ion battery negative electrode material
  • A kind of lignin porous carbon with uniform pores and its preparation method and application in lithium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Mix 1g of wood pulp alkali lignin solid powder and 0.1g of sodium benzoate and dissolve in 200mL of absolute ethanol, add 1g of nano-silica (particle size 20nm) and mix evenly, stir at a rate of 5mL / min 200 mL of water was added, the precipitate was separated by centrifugation, and dried to obtain a silica / lignin mixture.

[0052] Take 1g of the silica / lignin mixture and place it in a hydrothermal reaction kettle, add 100mL of water with pH=2, mix well, heat to 120°C, react for 1h, filter and separate to obtain a precipitate, dry it and place it in a nitrogen atmosphere to raise the temperature Keep at 600°C for 2 hours to obtain a silica / lignin-carbon composite material, and finally place it in a 1mol / L NaOH solution and stir for 24 hours, then wash with water, filter, and dry to obtain a lignin porous carbon material .

Embodiment 2

[0054] Mix 1g of wheatgrass lignin solid powder and 0.1g of sodium p-aminobenzoate and dissolve in 50mL of absolute ethanol, add 0.1g of nano-silica (particle size 100nm) and mix evenly, stir at 30mL / min 500 mL of water was added at a rate of 1000 mph, the precipitate was separated by centrifugation, and the silica / lignin mixture was obtained after drying.

[0055] Take 1g of the silica / lignin mixture and place it in a hydrothermal reaction kettle, add 10mL of water with pH=4, mix well, heat to 120°C, react for 3h, filter and separate to obtain a precipitate, dry it and place it in a nitrogen atmosphere to raise the temperature Keep at 900°C for 2 hours to obtain a silica / lignin carbon composite material, and finally place it in a 2mol / L NaOH solution and stir for 12 hours, then wash with water, filter and dry to obtain a lignin porous carbon material .

Embodiment 3

[0057] Mix 0.5g wheatgrass alkali lignin and 0.5g bamboo pulp alkali lignin solid powder with 0.1g sodium p-aminobenzenesulfonate and dissolve in 50mL absolute ethanol, add 0.25g nano silicon dioxide (30nm particle size) and Mix evenly, add 150 mL of water at a rate of 30 mL / min under stirring, centrifuge to separate the precipitate, and dry to obtain a silica / lignin mixture.

[0058] Take 1g of the silica / lignin mixture and place it in a hydrothermal reaction kettle, add 20mL of water with pH=3, mix well, heat to 200°C, react for 1h, filter and separate to obtain a precipitate, dry it and place it in a nitrogen atmosphere to raise the temperature Keep at 600°C for 5 hours to obtain a silica / lignin-carbon composite material, and finally place it in a 3mol / L KOH solution and stir for 10 hours, then wash with water, filter, and dry to obtain a lignin porous carbon material .

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Abstract

The invention belongs to the technical field of biomass-based carbon materials, and discloses lignin porous carbon with even pore channels and a preparation method thereof and application in a lithiumion battery anode material. The preparation method comprises the following steps that alkali lignin and a cosolvent are mixed evenly and then dissolved in ethyl alcohol to prepare an ethyl alcohol solution with the concentration of 5-20 g / L, nano-silica is added, water is added for precipitation, and sediments are separated and dried to obtain a silica / lignin mixture; the silica / lignin mixture isadded into water with the pH of 2-4 to prepare suspension liquid with the concentration of 10-100 g / L, reaction is carried out at 120-200 DEG C for 1-3 hours, filtering and drying are conducted, a product is placed in the inert atmosphere for carbonization at 500-900 DEG C for 2-5 hours, and then a silica / lignin carbon compound material is obtained; the silica / lignin carbon compound material is soaked in alkaline liquid with the concentration of 1-5 mol / L for stirring for 1-24 hours, washed with water, filtered and dried to obtain a lignin porous carbon material with the even pore channels. The lignin porous carbon material with the even pore channels can be applied to the lithium ion battery anode material.

Description

technical field [0001] The invention belongs to the technical field of biomass-based carbon materials, and in particular relates to a lignin porous carbon with uniform pores, a preparation method thereof and an application in negative electrode materials of lithium ion batteries. Background technique [0002] As the problems of energy shortage and environmental degradation become more and more prominent, countries all over the world have raised the development of green and environmentally friendly new energy to a strategic height. Therefore, developing a new type of energy storage device that is green, pollution-free, and high in power density has become a research hotspot in the world today. Due to its high energy density, long cycle life, environmental protection and safety, lithium-ion batteries have been widely used in many small electronic products, and are developing in the field of energy storage such as electric vehicles and hybrid electric vehicles. Energy matters....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01M4/48H01M4/62
CPCC01B32/05H01M4/48H01M4/625Y02E60/10
Inventor 杨东杰李常青邱学青席跃宾庞煜霞易聪华刘伟峰
Owner SOUTH CHINA UNIV OF TECH
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