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A kind of preparation method of lignin-based phenolic resin capacitor carbon
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A lignin-based, phenolic resin technology, applied in chemical instruments and methods, non-metallic elements, inorganic chemistry, etc., can solve the problems of difficult industrial application and high production cost of phenolic resin capacitor carbon, and improve the bonding strength and market competition. force and application range, cost reduction effect
Active Publication Date: 2019-10-18
JILIN UNIV
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[0007] The purpose of the present invention is to solve the problems in the prior art that the preparation cost of phenolic resin capacitor carbon is high, industrial application is difficult, and its performance as a negative electrode material of lithium ion battery needs to be further improved, and a preparation method of lignin-based phenolic resin capacitor carbon is provided
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preparation example Construction
[0037] The preparation method of lignin-based phenolic resin capacitor carbon of the present invention comprises the steps:
[0038] Step 1. Preprocessing
[0039] Mix lignin-containing biomass with sulfuric acid solution with a concentration of 1-3wt% at a solid-to-liquid ratio of 1Kg: (7-10L), heat and reflux for 2-4 hours, remove hemicellulose and soluble impurities, filter, and obtain hydrolyzed Slag, washed to neutral;
[0040] Among them, the biomass containing lignin is not particularly limited, including but not limited to plant stalks (such as wheat straw, rice straw, etc.), wood processing waste and bamboo processing waste, and the biomass containing lignin can be one or more types. Mixing in any proportion;
[0041] Step 2. Alkali-catalyzed degradation of lignin
[0042] Transfer the washed to neutral hydrolysisslag obtained in step 1 to a reaction kettle, add an alkaline solution with a concentration of 3-8wt%, heat and reflux for 3-6h, lignin is degraded into ...
Embodiment 1
[0061] Step 1. Mix the corn cob containing lignin with the sulfuric acid solution with a concentration of 3wt% at a solid-to-liquid ratio of 1Kg:10L, heat and reflux for 4 hours, remove hemicellulose and soluble impurities, filter to obtain hydrolyzed slag, and wash to medium sex;
[0062] Step 2. Transfer the washed to neutral hydrolyzed slag obtained in step 1 to a reaction kettle, add a sodiumhydroxide solution with a concentration of 4wt% to mix, heat and reflux for 3 hours, lignin is degraded into small molecules and dissolved, and the temperature is lowered to room temperature. Filter to obtain alkali lignin solution;
[0064] Step 3: Add the alkali lignin solution and phenol obtained in step 2 into the reaction kettle, then add a sodiumhydroxide solution with a concentration of 10 wt%, raise the temperature to 90° C., and reflux the phenolization modificat...
Embodiment 2
[0073] The mass of lignin in the alkali lignin solution was replaced by 30% of the total mass of lignin and phenol, and the other conditions were the same as in Example 1 to obtain a lignin-based phenolic resin capacitor carbon product 30% N-LPFC-4.
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Abstract
The invention relates to a preparation method of lignin based phenolic resin capacitor carbon, belongs to the technical field of biomass energy and chemical industry, and solves the problems of high preparation cost, difficult industrial application and to-be-improved performance as a negative electrode material of a lithiumion battery of phenolic resin capacitor carbon in the prior art. The method is as follows: acid hydrolysis of biomass, alkali extraction of lignin to obtain an alkali lignin solution, use of phenol as a phenolation reagent and an alkali as a catalyst for alkali lignin phenolation modification, substitution of the phenol with modified lignin in different proportions, addition of the modified lignin and the phenol into a formaldehyde solution for in situ polymerization for preparation of a lignin phenolic resin adhesive, curing and crushing for preparation of lignin-based phenolic resin powder, further carbonization and activation for preparation of the lignin based phenolic resin capacitor carbon. The method can control the multilevel pore structure of the capacitor carbon by adjusting of the amount of lignin, and capacitor carbon products with different multilevel pore structures can be produced according to demands of electrochemical performances.
Description
technical field [0001] The invention belongs to the field of biomass energy chemical industry, and relates to a preparation method of lignin-based phenolic resin capacitor carbon, in particular to lignin-substituted phenol, ternary copolymerization with phenol and formaldehyde to prepare lignin-based phenolic resin adhesive, and curing to prepare wood A method for preparing lignin-based phenolic resin capacitor carbon by carbonizing and activating the base phenolic resin powder. Background technique [0002] Lithium-ion batteries were first successfully developed by Sony Corporation of Japan in 1990. Its negative electrode material is formed by embedding lithium ions in carbon (petroleumcoke and graphite), and the positive electrode material is commonly used Li x CoO 2 , Li x NiO 2 , Li x MnO 4 , the electrolyte uses LiPF 6 + Diethylene carbonate (EC) + Dimethyl carbonate (DMC), mainly rely on lithium ions to move between the positive and negative electrodes to work, ...
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