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Lignin-based hard carbon/carbon nanotube composite material and preparation method and application thereof in negative electrode materials of lithium ion batteries

A technology of carbon nanotubes and composite materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reduced first-time charge and discharge efficiency, reduced lithium-ion battery capacity, and increased difficulty, achieving good cycle stability, High energy density, environmental protection effect

Active Publication Date: 2018-04-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, functional groups such as C-O and C-H are likely to remain on the surface of lignin-based hard carbon materials, and it is more difficult to form a stable surface solid electrolyte film in the electrolyte, which will easily lead to a decrease in the first charge and discharge efficiency.
In addition, the rich pore structure is easy to collapse due to volume expansion during charging and discharging, reducing the capacity of lithium-ion batteries.

Method used

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  • Lignin-based hard carbon/carbon nanotube composite material and preparation method and application thereof in negative electrode materials of lithium ion batteries
  • Lignin-based hard carbon/carbon nanotube composite material and preparation method and application thereof in negative electrode materials of lithium ion batteries
  • Lignin-based hard carbon/carbon nanotube composite material and preparation method and application thereof in negative electrode materials of lithium ion batteries

Examples

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Effect test

Embodiment 1

[0060] Take 200g of enzymatic lignin as raw material and put it in sodium hydroxide solution, stir at 70°C for 2 hours, and ensure that the pH of the solution is ≥ 12; after the dissolution is complete, filter to remove insoluble impurities and collect the filtrate, and add 50% of the filtrate dropwise Sulfuric acid solution, adjust the pH value of the solution to 2, so that the enzymatic lignin aggregates and settles; let it stand for more than 24 hours, and after the lignin has settled completely, filter, wash, and dry to obtain purified enzymatic lignin (EHL).

[0061] Take 250 mg of enzymatic lignin and disperse it in 125 mL of aqueous ethanol (V ethanol: V water = 1:4), ultrasonicate for 30 min and stir for 30 min, then repeat the ultrasonic and stirring once; take 100 mg of carbon nanotube solid powder and add it to 50 mL of ethanol aqueous (V ethanol : V water = 1:4), ultrasonically dispersed for 30 minutes and stirred for 30 minutes, and then repeated ultrasonic and sti...

Embodiment 2

[0078] Take 200g of enzymatic lignin as raw material and put it in sodium hydroxide solution, stir at 70°C for 2 hours, and ensure that the pH of the solution is ≥ 12; after the dissolution is complete, filter to remove insoluble impurities and collect the filtrate, and add 50% of the filtrate dropwise Sulfuric acid solution, adjust the pH value of the solution to 2, so that the enzymatic lignin aggregates and settles; let it stand for more than 24 hours, and after the lignin has settled completely, filter, wash, and dry to obtain purified enzymatic lignin (EHL).

[0079] Take 300 mg of enzymatic lignin and disperse it in 150 mL of aqueous ethanol (V ethanol: V water = 1:4), sonicate for 30 min and stir for 30 min, then repeat the ultrasonic and stirring once; take 80 mg of carbon nanotube solid powder and add it to 40 mL of ethanol water (V ethanol : V water = 1:4), ultrasonically dispersed for 30 minutes and stirred for 30 minutes, and then repeated ultrasonic and stirred onc...

Embodiment 3

[0084] Dissolve 200g of raw material enzymatic lignin in sodium hydroxide solution, stir at 70°C for 2 hours, and ensure that the pH of the solution is ≥ 12; after the dissolution is complete, filter to remove insoluble impurities and collect the filtrate, and add 50% of Sulfuric acid solution, adjust the pH value of the solution to 2, so that the enzymatic lignin aggregates and settles; let it stand for more than 24 hours, and after the lignin has settled completely, filter, wash, and dry to obtain purified enzymatic lignin (EHL).

[0085] Take 250 mg of enzymatic lignin and disperse it in 125 mL of aqueous ethanol (V ethanol: V water = 1:4), ultrasonicate for 30 min and stir for 30 min, then repeat the ultrasonic and stirring once; take 100 mg of carbon nanotube solid powder and add it to 50 mL of ethanol aqueous (V ethanol : V water = 1:4), ultrasonically dispersed for 30 minutes and stirred for 30 minutes, and then repeated ultrasonic and stirred once. The above lignin dis...

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Abstract

The invention belongs to the technical field of negative electrode materials of lithium ion batteries and discloses a lignin-based hard carbon / carbon nanotube composite material and a preparation method and application thereof in the negative electrode materials of the lithium ion batteries. The preparation method includes steps: respectively ultrasonically dispersing lignin and carbon nanotubes into organic solvent aqueous solution, mixing, adding alkali for adjusting pH to alkaline, and ultrasonically uniformly dispersing; adding acid for adjusting pH to 1-4, standing, and separating to obtain a lignin / carbon nanotube compound; adding the compound and an activating agent into water, heating, well stirring, heating and drying to obtain a lignin-based hard carbon / carbon nanotube compositematerial precursor; carbonizing the precursor to obtain the lignin-based hard carbon / carbon nanotube composite material. A surface area range of the lignin-based hard carbon / carbon nanotube compositematerial prepared according to the method is 500-3000m<2> g<-1>, activation time is 0.5-6h, and the lignin-based hard carbon / carbon nanotube composite material can be applied to the negative electrodematerials of the lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials, and in particular relates to a lignin-based hard carbon / carbon nanotube composite material, a preparation method thereof and an application in lithium-ion battery negative electrode materials. Background technique [0002] With the development of society and the continuous updating of science and technology, the society's demand for low-cost and high-efficiency energy storage equipment is increasing. Lithium-ion batteries have the advantages of high energy storage density, high open circuit voltage, and low self-discharge rate, and are widely used in portable electronic equipment, grid energy storage equipment, aerospace equipment, and new energy vehicles. In recent years, the rapid development of new energy vehicles has put forward higher and higher requirements for the capacity and energy density of lithium-ion batteries. [0003] At present, in commerc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCH01M4/362H01M4/583H01M10/0525Y02E60/10
Inventor 杨东杰席跃宾邱学青王欢刘伟峰钱勇黄锦浩
Owner SOUTH CHINA UNIV OF TECH
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