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Preparation method of CMCLi and application thereof

A technology of reaction and ionic liquid, which is applied in the field of CMCLi preparation, can solve the problems of carboxymethyl cellulose lithium with many by-products and low purity, and achieve the effect of high degree of substitution, high purity and easy biodegradation

Inactive Publication Date: 2019-03-29
瑞红锂电池材料(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carboxymethyl cellulose lithium by-product that above-mentioned method produces is more, and purity is lower

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of CMCLi comprises the steps,

[0035] Step 1: Dissolve 5 parts of microcrystalline cellulose with 50 parts of 1-butyl-3-methylimidazolium chloride salt BMImCl at 140°C, then add 1 part of lithium hydroxide and mix evenly to obtain the first mixed solution;

[0036] Step 2: keep the temperature at 50° C., add 1 part of chloroacetic acid to the first mixed solution for reaction, and post-process after the reaction to obtain CMCLi.

[0037] During post-treatment, the crude CMCLi was neutralized with glacial acetic acid to a pH of 6, precipitated with methanol, washed with methanol, filtered to remove liquid, dried at 60°C, and pulverized to obtain CMCLi.

Embodiment 2

[0039] The preparation method of CMCLi comprises the steps,

[0040] Step 1: Dissolve 5 parts of microcrystalline cellulose at 140°C with 80 parts of 1-methylimidazolium chloride salt MImCl, then add 2 parts of lithium hydroxide and mix evenly to obtain the first mixed solution;

[0041] Step 2: keep the temperature at 55° C., add 2 parts of chloroacetic acid to the first mixed solution for reaction, and post-process after the reaction to obtain CMCLi.

[0042] During post-treatment, the crude CMCLi is neutralized with glacial acetic acid to a pH of 6, precipitated through a mixture of methanol and water, washed with a mixture of methanol and water, filtered to remove the liquid, dried at 70°C, and pulverized to obtain CMCLi. Methanol accounts for 65% of the mass of the mixture.

Embodiment 3

[0044] The preparation method of CMCLi comprises the steps,

[0045] Step 1: Dissolve 5.1 parts of microcrystalline cellulose with 100 parts of 1-ethyl-3-methylimidazolium chloride salt EMImCl at 120°C, then add 3 parts of lithium hydroxide and mix evenly to obtain the first mixed solution;

[0046] Step 2: keep the temperature at 60° C., add 3 parts of chloroacetic acid to the first mixed solution for reaction, and post-process after the reaction to obtain CMCLi.

[0047] During the post-treatment, the crude CMCLi is neutralized with glacial acetic acid to a pH of 6, precipitated through a mixture of ethanol and water, washed with a mixture of ethanol and water, filtered to remove the liquid, dried at 75°C, and pulverized to obtain CMCLi. Wherein ethanol accounts for 70% of the mixed solution quality.

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Abstract

The invention relates to a preparation method of CMCLi and an application thereof, which belong to the field of a lithium battery material. The method comprises the following steps: step 1) dissolvingthe cellulose by using ionic liquid, adding lithium hydroxide and uniformly mixing the materials to obtain first mixed liquid; and step 2: adding an acetylating reagent to the first mixed liquid, andafter the reaction is finished, performing post-treatment to obtain CMCLi. The ionic liquid is selected as a solvent, and then alkalized and acetylated to generate the CMCLi. The generated CMCLi hasa controllable structure, uniform distribution of substituents, high substitution degree of cellulose branch, high flexibility, and high purity.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a preparation method and application of CMCLi. Background technique [0002] Lithium-ion batteries currently produced in my country can be divided into the following two categories according to electrolytes: one uses liquid organic electrolytes and organic solvents dissolved with conductive salts; the other uses colloidal polymer electrolytes, all of which require steel shells or Sturdy secondary packaging such as an aluminum shell to contain the flammable organic solvent active ingredient electrolyte to prevent leakage. [0003] However, the potential pollution after these batteries are discarded has attracted widespread attention from all walks of life, because these batteries contain a large amount of electrolyte solutions such as heavy metals, waste acid, and waste alkali, and rotten batteries contain heavy metals such as chromium, lead, mercury, nickel, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12H01M4/62H01M10/0525
CPCC08B11/12H01M4/621H01M10/0525Y02E60/10
Inventor 周振文邱磊朱生文
Owner 瑞红锂电池材料(苏州)有限公司
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