Silica/lignin porous carbon composite material, preparation method thereof and application in lithium ion battery anode material

A technology of silica and composite materials, applied in nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc. The electrode structure is destroyed and the active material is difficult to form the SEI film, etc., to achieve a good application prospect, suppress the volume expansion, and enhance the volume expansion effect.

Active Publication Date: 2018-11-23
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two major problems with silicon-based anode materials: one is that the volume is easily swelled during the process of extracting / intercalating lithium ions, which leads to the crushing of the active material and the destruction of the electrode structure, and the huge volume effect makes it difficult for the active material to form a stable SEI film. , resulting in rapid decay of lithium intercalation capacity and poor cycle stability; second, poor electrical conductivity, which affects the lithium storage capacity of active components and the rate performance of negative electrode materials
However, the material is poor in cycle stability and adhesion, making it difficult to achieve commercial applications
In addition, the preparation process of silicon-based composites is complicated, and the high production cost is also an obstacle to its commercial production.

Method used

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  • Silica/lignin porous carbon composite material, preparation method thereof and application in lithium ion battery anode material
  • Silica/lignin porous carbon composite material, preparation method thereof and application in lithium ion battery anode material
  • Silica/lignin porous carbon composite material, preparation method thereof and application in lithium ion battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Take 1g of alkali lignin solid powder and 0.01g of dodecanol and mix it into 200mL of absolute ethanol to dissolve; add 0.25g of nano-silica (particle size 10nm) and mix evenly; 200 mL of water was added at a high speed, the precipitate was separated by centrifugation, and the silica / lignin mixture was obtained after drying.

[0056] 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 prepare the silica / lignin-carbon composite material, then place it in 1mol / L hydrofluoric acid and stir for 4 hours, then wash with deionized water, filter and spray dry to obtain the two Silica / lignin porous carbon composites.

Embodiment 2

[0058]Take 0.5g of alkali lignin and 0.5g of enzymolytic lignin solid powder and mix them with 0.1g of n-butanol and add to 50mL of absolute ethanol to dissolve; add 1.0g of nano silicon dioxide (particle size 100nm) and mix evenly, stir 500mL of water was added at a rate of 30mL / min, the precipitate was separated by centrifugation, and the silica / lignin mixture was obtained after infrared drying.

[0059] 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 200°C, react for 3h, filter and dry the precipitate, and then 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, then place it in 0.5mol / L hydrofluoric acid and stir for 24 hours, then wash with deionized water, filter and dry to obtain the two Silica / lignin porous carbon composites.

Embodiment 3

[0061] Take 5g of enzymolytic lignin solid powder and 0.05g of ethylene glycol, mix it with 250mL of absolute ethanol and dissolve it; add 5g of nano-silicon dioxide (particle size 30nm) and mix evenly, and stir at 10mL / min Add 750 mL of water at a high rate, centrifuge to separate the precipitate, and dry to obtain a silica / lignin mixture.

[0062] Take 5g of the silica / lignin mixture and place it in a hydrothermal reaction kettle, add 50mL of water with pH = 3, mix well, heat to 160°C, react for 1h, filter and dry the precipitate, and then place it in a nitrogen atmosphere to raise the temperature Keep at 700°C for 2 hours to obtain a silica / lignin carbon composite material; then place it in 1mol / L hydrofluoric acid and stir for 4 hours, then wash with deionized water, filter and dry to obtain carbon dioxide Silicon / lignin porous carbon composites.

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Abstract

The invention belongs to the technical field of lithium ion battery anode materials, and discloses a silica/lignin porous carbon composite material, a preparation method thereof and application in a lithium ion battery anode material. The preparation method provided by the invention comprises the steps of: dissolving the industrial lignin and auxiliary agent in ethanol to prepare a solution havinga mass concentration of 5-20 g/L, adding nano silica for uniform mixing, adding water to precipitate, separating the precipitate, and drying to obtain a silica/lignin mixture; adding the mixture to water having a pH of 2 to 4 to prepare a suspension having a concentration of 10 to 100 g/L, carrying out reaction at 120 to 200 degrees centigrade for 1 to 3 hours, drying the precipitate after filtration, carrying out carbonization in the inert atmosphere of 500 to 900 degrees centigrade for 2 to 5 hours, immersing in 0.05-2mol/L of hydrofluoric acid for stirring for 1 to 24 hours, and obtainingthe silica/lignin porous carbon composite material after washing, filtering and drying. The invention may be applied to lithium ion battery anode materials.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials, and in particular relates to a silicon dioxide / lignin porous carbon composite material, a preparation method thereof, and an application in lithium-ion battery negative electrode materials. 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, the development of a new type of energy storage device with green, pollution-free and high 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 elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/485H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 邱学青杨东杰李常青刘伟峰楼宏铭钱勇欧阳新平
Owner SOUTH CHINA UNIV OF TECH
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