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Method for preparing C/SiOx composite lithium battery negative electrode material from liquid wastes obtained by alkali treatment of non-wood papermaking materials

A battery negative electrode and alkali treatment technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of not reaching the practical level, poor electronic conductivity, and large irreversible capacity, so as to alleviate silicon interference, expand production, and reduce Effect of silicon content

Inactive Publication Date: 2019-02-15
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SiO x Although the cycle stability of the material is better than that of simple Si, it is far from the practical level; SiO x The material is a semiconductor, and its electronic conductivity is poor, which directly restricts the electrochemical performance of the material; SiO x The first irreversible capacity of the material is large, and the first Coulombic efficiency is low

Method used

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  • Method for preparing C/SiOx composite lithium battery negative electrode material from liquid wastes obtained by alkali treatment of non-wood papermaking materials
  • Method for preparing C/SiOx composite lithium battery negative electrode material from liquid wastes obtained by alkali treatment of non-wood papermaking materials
  • Method for preparing C/SiOx composite lithium battery negative electrode material from liquid wastes obtained by alkali treatment of non-wood papermaking materials

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Effect test

Embodiment 1

[0028] ①Dry Miscanthus in the sun, remove most of the dust, and cut the raw material into short pieces of about 2cm with a guillotine. Then, go through a vibrating screen with strong magnets to remove stones, iron filings or small iron pieces introduced during the harvesting process, then wash with tap water, and finally dry;

[0029] ②Put the clean raw material obtained in step ① into the reaction vessel, add 3mol / L NaOH solution according to the solid-to-liquid ratio of 1:5 (g:mL), seal the reaction vessel, and start timing for 3 hours from room temperature to 120°C. After the reaction is completed, filter with a Buchner funnel to collect the alkali treatment waste liquid and the residue of non-wood papermaking raw materials;

[0030] ③Under the condition of continuous stirring, use an acid burette to add 4mol / L hydrochloric acid solution to the alkali treatment waste liquid obtained in step ② at a rate of 3mL / min until the pH value of the alkali treatment waste liquid is 3,...

Embodiment 2

[0034] ①Dry the bamboo in the sun, remove most of the dust, and cut the raw material into short pieces of about 2cm with a guillotine. Then, go through a vibrating screen with strong magnets to remove stones, iron filings or small iron pieces introduced during the harvesting process, then wash with tap water, and finally dry;

[0035] ② Put the clean raw material obtained in step ① into the reaction vessel, add 1.5mol / L NaOH solution according to the solid-to-liquid ratio of 1:4 (g:mL), seal the reaction vessel, and start timing from room temperature to 150°C for 2 hours. After the reaction is completed, filter with a Buchner funnel to collect the alkali treatment waste liquid and the residue of non-wood papermaking raw materials;

[0036] ③Under continuous stirring, add 1.5mol / L hydrochloric acid solution to the alkali treatment waste liquid obtained in step ② at a rate of 4mL / min with an acid burette until the pH value of the alkali treatment waste liquid is 4, and heat to 9...

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Abstract

The invention discloses a green production process for preparing a C / SiOx composite lithium battery negative electrode material from liquid wastes obtained by alkali treatment of non-wood papermakingmaterials. The process comprises the following steps: removing metal impurities introduced in a process of collecting Chinese silvergrass or bamboo by using a strong magnet, and washing with running water to remove soil in the impurities; cooking the raw materials with a NaOH solution, precipitating out a xylogen / SiO2 hybrid material from the alkali treatment waste liquor with acid liquor, carbonizing the xylogen / SiO2 hybrid material, and performing carbon thermal reduction to obtain a C / SiOx composite lithium battery negative electrode material; cooking the residues to be directly used for pulping and papermaking, neutralizing, distilling and drying the waste liquor produced in the preparation process of the C / SiOx lithium battery negative electrode material so as to obtain solid residues, wherein the solid residues can serve as edible salt of animals. Each component in the non-wood papermaking materials and each of the input chemical reagents can be fully utilized.

Description

technical field [0001] The invention relates to a method for preparing a C / SiOx composite lithium battery negative electrode material from non-wood papermaking raw material alkali treatment waste liquid, which belongs to the preparation of renewable energy materials and their application in lithium ion batteries. Background technique [0002] my country still uses a large number of non-wood plant fiber raw materials such as miscanthus and bamboo in papermaking. However, the problem of high silicon content of non-wood raw materials seriously affects the pulping process compared with wood raw materials, SiO 2 The presence of black liquor will cause serious fouling when the black liquor is evaporated and concentrated, which affects the evaporation efficiency and the effective utilization of white mud. In the causticizing section, CaSiO will be generated in the causticizing reaction of green liquor 3 , during the lime mud calcination process, the silicon contained in the lime ...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/48H01M4/625Y02E60/10
Inventor 崔金龙张永强赫文秀张海浜
Owner INNER MONGOLIA UNIV OF SCI & TECH