Preparation method and application of lignin-based hard carbon

A lignin-based, lignin-based technology, applied in the field of lithium-ion capacitors, can solve problems such as insufficient pulse discharge capacity, high manufacturing cost, and complicated process, and achieve the effects of first-time efficiency, low cost, and simple preparation and operation

Active Publication Date: 2020-05-19
合盛科技(宁波)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high manufacturing cost, complex process and insufficient pulse discharge capacity when applied to lithium-ion capacitors in the prior art, and propose a simple manufacturing process that can be used as lithium-ion capacitor negative materials. Preparation method of lignin-based hard carbon with strong pulse discharge capability, good low-temperature performance, and low DC internal resistance, which can promote the large-scale application of hard carbon in the field of lithium-ion capacitors

Method used

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  • Preparation method and application of lignin-based hard carbon
  • Preparation method and application of lignin-based hard carbon

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Experimental program
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Effect test

Embodiment 1

[0043] (1) Pretreatment: Add 100g of sodium lignosulfonate to 500g of 2% sodium hydroxide solution with a mass concentration of 0.5 to 1.5h for ultrasonic treatment, the weight ratio of sodium lignosulfonate to sodium hydroxide solution is 1:5 , then the product after the alkali treatment is filtered, 20g hydrochloric acid is added in the filtrate, after standing until the solution is layered, the lower layer of precipitate is taken, and the steps of the above-mentioned pretreatment (alkaline treatment, acid treatment and washing) are repeated twice. The obtained precipitate was dried at 80° C. for 12 hours to obtain 65 g of sodium lignosulfonate after removal of impurities for use.

[0044] (2) Preparation of lignin nanoparticle precursor: Take 100g of acetone and 100g of deionized water and mix evenly to make an acetone aqueous solution, add 10g of pretreated sodium lignosulfonate to the acetone aqueous solution, and form lignin after fully dissolving for 4 hours Nanoparticl...

Embodiment 2

[0047](1) Pretreatment: Add 100g of sodium lignosulfonate to 500g of 2% sodium hydroxide solution with a mass concentration of 0.5 to 1.5h for ultrasonic treatment, the weight ratio of sodium lignosulfonate to sodium hydroxide solution is 1:5 , then the product after the alkali treatment is filtered, 20g hydrochloric acid is added in the filtrate, after standing until the solution is layered, the lower layer of precipitate is taken, and the steps of the above-mentioned pretreatment (alkaline treatment, acid treatment and washing) are repeated twice. The obtained precipitate was dried at 80° C. for 12 hours to obtain 65 g of sodium lignosulfonate after removal of impurities for use.

[0048] (2) Preparation of lignin nanoparticle precursor: Take 20g of acetone and 100g of deionized water and mix evenly to make an acetone aqueous solution, add 10g of pretreated sodium lignosulfonate to the acetone aqueous solution, and form lignin after fully dissolving for 4 hours Nanoparticle ...

Embodiment 3

[0051] (1) Pretreatment: Add 100g of sodium lignosulfonate to 500g of 2% sodium hydroxide solution with a mass concentration of 0.5 to 1.5h for ultrasonic treatment, the weight ratio of sodium lignosulfonate to sodium hydroxide solution is 1:5 , then the product after the alkali treatment is filtered, 20g hydrochloric acid is added in the filtrate, after standing until the solution is layered, the lower layer of precipitate is taken, and the steps of the above-mentioned pretreatment (alkaline treatment, acid treatment and washing) are repeated twice. The obtained precipitate was dried at 80° C. for 12 hours to obtain 65 g of sodium lignosulfonate after removal of impurities for use.

[0052] (2) Preparation of lignin nanoparticle precursor: Take 30g of acetone and 100g of deionized water and mix evenly to make an acetone aqueous solution, add 10g of pretreated sodium lignosulfonate to the acetone aqueous solution, and form lignin after fully dissolving for 4 hours Nanoparticle...

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Abstract

The invention relates to a preparation method and application of lignin-based hard carbon, and belongs to the technical field of energy storage. The preparation method of the lignin-based hard carboncomprises the following steps: pretreating lignin, and dissolving the pretreated lignin in an organic solvent solution to form a lignin nanoparticle precursor solution; drying the lignin nanoparticleprecursor solution to prepare a lignin nanoparticle precursor; and carrying out vacuum carbonization on the lignin nanoparticle precursor to prepare the lignin-based hard carbon. The lignin-based hardcarbon disclosed by the invention is simple in preparation process, strong in pulse discharge capability, good in low-temperature performance and low in direct-current internal resistance when beingused as a negative electrode material of a lithium ion capacitor.

Description

technical field [0001] The invention belongs to the technical field of lithium ion capacitors, and relates to a preparation method of lignin-based hard carbon and the application of lignin-based hard carbon in negative electrode materials of lithium ion capacitors. Background technique [0002] As a new type of energy storage device with high power characteristics of electric double layer capacitors and high energy density of lithium-ion batteries, lithium-ion capacitors are used in short-term high-power applications such as smart three-meter (water, gas, and electricity meters), Internet of Things, and smart homes. The field of discharge (usually requiring more than 300mA to be able to discharge for more than 1s) has been widely used. Compared with electric double layer capacitors, this type of device has high energy density (more than 5 to 10 times higher), low self-discharge current (≤2μA), and high voltage platform (the highest voltage can reach 3.8V, which can be compar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01G11/44H01G11/50H01G11/86
CPCC01B32/05H01G11/44H01G11/50H01G11/86Y02E60/13
Inventor 李辉侯保辉张志伟杨斌胡世勇
Owner 合盛科技(宁波)有限公司
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