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Preparation method of nickel sulfide particles/cellulose-based carbon aerogel materials

A cellulose hydrogel, cellulose-based technology, applied in the field of nickel sulfide particles/cellulose-based composite carbon airgel materials and its preparation, can solve the low specific capacity of carbon airgel, adverse effects on the environment and human health , carbon aerogel limitations, etc., to achieve the effect of optimizing electrochemical performance, ingenious design ideas, and low price

Active Publication Date: 2017-11-21
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Carbon airgel is used to prepare electrode materials because of its high specific surface area, good electrical conductivity and thermal stability, but the specific capacity of carbon aerogel is low, and it is one of the commonly used raw materials for the preparation of this carbon aerogel Formaldehyde is a toxic gas that can adversely affect the environment and human health
Therefore, carbon aerogels are limited during use

Method used

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  • Preparation method of nickel sulfide particles/cellulose-based carbon aerogel materials
  • Preparation method of nickel sulfide particles/cellulose-based carbon aerogel materials
  • Preparation method of nickel sulfide particles/cellulose-based carbon aerogel materials

Examples

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Embodiment 1

[0029] Fully dissolve 20g of sodium hydroxide in 80g of deionized water to prepare a 20wt% sodium hydroxide solution; fully dissolve 30g of urea in 70g of deionized water to prepare a 30wt% urea solution. Among them, sodium hydroxide can also be replaced by other alkaline substances, such as potassium hydroxide and lithium hydroxide.

[0030] Get 19g of 20wt% sodium hydroxide mixed with 19g of 30wt% urea solution, add 2g of bacterial cellulose, and transfer it to a refrigerator to freeze, and the cooling temperature range is -18 to 10°C. Stir the frozen bacterial cellulose / sodium hydroxide / urea / water mixture rapidly to dissolve the cellulose to obtain a concentrated solution of bacterial cellulose.

[0031] The obtained concentrated cellulose solution is poured into a mold and heated in water for a period of time to obtain an alkaline cellulose hydrogel. Wherein the heating temperature is 50-120°C, preferably 60-90°C, and the heating time is 1-10 hours, preferably 2-6 hours. ...

Embodiment 2

[0037] Fully dissolve 10g of sodium hydroxide in 90g of deionized water to prepare a 10wt% sodium hydroxide solution; fully dissolve 20g of urea in 80g of deionized water to prepare a 20wt% urea solution. Get 99g of 10wt% sodium hydroxide mixed with 99g of 20wt% urea solution, add 2g of plant cellulose, and transfer it to a refrigerator to freeze, and the cooling temperature range is -18~10°C. Other processes of the preparation of the nickel sulfide / cellulose-based composite carbon aerogel are the same as in Example 1.

Embodiment 3

[0039] Fully dissolve 15g of sodium hydroxide in 85g of deionized water to prepare a 15wt% sodium hydroxide solution; fully dissolve 25g of urea in 75g of deionized water to prepare a 25wt% urea solution. Get 49g of 15wt% sodium hydroxide mixed with 49g of 25wt% urea solution, add 2g of bacterial cellulose, and transfer it to a refrigerator to freeze, and the cooling temperature range is -18 to 10°C. Other processes of the preparation of the nickel sulfide / cellulose-based composite carbon aerogel are the same as in Example 1.

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Abstract

The present invention discloses a preparation method of nickel sulfide particles / cellulose-based carbon aerogel materials. The nickel sulfide / cellulose-based carbon aerogel takes one or more than one types of celluloses, nickel salt and sulfur sources as raw materials. The preparation process comprises: dissolving the celluloses to cellulose concentrated solution, and preparing cellulose aerogel through the collosol-gel process and the freeze drying technology; preparing and obtaining cellulose-based carbon aerogel through the high-temperature carbonization processing; and performing in-situ growth of nickel sulfide particles on the cellulose-based carbon aerogel through a single-step solvothermal method. The method provided by the invention employs celluloses with wide sources and low cost as a precursor without usage of poisonous and harmful reagent, the prepared nickel sulfide particles / cellulose-based carbon aerogel is uniform in distribution of nickel sulfide particles, high in specific surface area and high in conductivity, and therefore the nickel sulfide particles / cellulose-based carbon aerogel materials are ideal electrode materials of a new energy device such as a supercapacitor, a lithium ion battery and the like.

Description

technical field [0001] The invention belongs to the technical field of transition metal sulfide-carbon airgel, and in particular relates to a nickel sulfide particle / cellulose-based composite carbon airgel material and a preparation method thereof. Background technique [0002] Airgel is a kind of porous gel substance with a three-dimensional network structure using gas as the dispersion medium. The porosity is generally 80-99.8%, and the specific surface area is generally 200-1000m2. 2 g -1 , with a density usually less than 0.1 g cm -3 . Since Kistler prepared the first aerogel-silica aerogel in 1931, polymer aerogels, carbon aerogels and other aerogels have appeared successively. In recent years, carbon aerogels have attracted extensive attention and applications due to their high porosity, low density, high specific surface area, high electrical conductivity, controllable structure, and good stability. The advantages of high porosity and high specific surface area ma...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/34H01M4/583H01M4/58H01M4/139H01G9/20H01G9/042
CPCH01G9/042H01G9/20H01G11/30H01G11/34H01M4/139H01M4/362H01M4/5815H01M4/583Y02E10/542Y02E60/10Y02E60/13
Inventor 刘天西左立增张由芳樊玮尹一戈董玥
Owner FUDAN UNIV
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