CN111533815A - Preparation method of nano-crystalline lithium cellulose for lithium battery - Google Patents
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- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B11/00—Preparation of cellulose ethers
- C08B11/02—Alkyl or cycloalkyl ethers
- C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
- C08B11/10—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals
- C08B11/12—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals substituted with carboxylic radicals, e.g. carboxymethylcellulose [CMC]
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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Abstract
The invention is applicable to the technical field of lithium batteries, and provides a preparation method of nano-crystalline lithium cellulose for a lithium battery. Specifically, the nano-cellulose acid is obtained by dispersing sodium cellulose prepared by a 2,2,6, 6-tetramethylpiperidine oxide induced catalytic oxidation method in an organic solvent, adding a hydrochloric acid aqueous solution for mixing, reacting at 20-50 ℃, then removing liquid, washing with the organic solvent with the volume concentration of 80-95%, and then treating. Dispersing nano cellulose acid in organic solvent, adding LiOH & H2And neutralizing the O aqueous solution with glacial acetic acid after reaction, washing with an organic solvent, removing the solution, drying and crushing to obtain the nano-crystalline lithium cellulose. By the preparation method, water with different degrees of substitution and different viscosities can be obtainedThe nano-crystalline cellulose lithium with excellent solubility provides a novel water-soluble binder with low price and excellent performance for the lithium battery.
Description
Technical Field
The invention belongs to the field of lithium batteries, and particularly relates to a preparation method of nano-crystalline lithium cellulose for a lithium battery.
Background
The lithium ion battery is a high-performance secondary battery, has the advantages of high working voltage, high volume and weight energy density, long service life, low self-discharge efficiency, no memory effect, environmental friendliness and the like, and is widely applied to the fields of mobile communication equipment, notebook computers, PDAs (personal digital assistants), digital cameras, electric tools, electric automobiles and the like. In recent years, the manufacturing technology of lithium ion batteries has been greatly improved, so that the capacity of cylindrical batteries with the model number of 18650 is improved from the initial 1200mAh to 2400 mAh. However, the coating method is still used for the production method of the battery electrode sheet (positive electrode sheet and negative electrode sheet). The coating method comprises oil-phase coating and water-phase coating. At present, the oil phase coating technology is still generally adopted when the pole pieces are produced on a large scale. Currently, the most used adhesives are fluoropolymer adhesives. For example: polyvinylidene fluoride (PVDF) and N-methyl pyrrolidone solution are used as binders. The fluorine-containing olefin polymer is used as an adhesive of an electrode material of a lithium ion battery, and the volatilization of a solvent in the manufacturing process pollutes the environment and also harms the health of operators. In addition, the solvent of the fluorine-containing polymer is expensive, which undoubtedly increases the production cost of the lithium ion battery.
The carboxymethyl cellulose for lithium ion batteries currently available on the market is sodium carboxymethyl cellulose (CMC-Na) or lithium carboxymethyl cellulose (CMC-Li), belongs to ionic cellulose ether, and is generally obtained by alkalization, etherification, neutralization and washing. By adopting the traditional CMC-Na preparation process, as the alkalinity of LiOH is far less than that of NaOH and the solubility is far less than that of NaOH, in the alkalization process, the cellulose is not uniformly contacted with alkali liquor, the alkalization is incomplete, a high-purity product cannot be obtained, the free alkali is excessive, the utilization rate of an etherifying agent is low in the etherification process, and byproducts are increased. Therefore, the CMC-Li product prepared by the process method for preparing CMC-Na has low degree of substitution, is not easy to dissolve and has weak binding power, and the use of the lithium carboxymethyl cellulose as the lithium battery binding agent is seriously limited.
In the patent CN101942028A, a process for preparing food-grade potassium carboxymethyl cellulose is described, which comprises adding 10% -40% sulfuric acid into food-grade sodium carboxymethyl cellulose for acidification, reacting at a certain temperature and time to obtain crude carboxymethyl cellulose acid, washing, dehydrating, drying and pulverizing to obtain pure carboxymethyl cellulose acid, and then adding solid alkali such as K2CO3, (NH4)2CO3 for neutralization to obtain potassium carboxymethyl cellulose.
In CN201110125121 patent, a preparation method of lithium carboxymethyl cellulose for lithium battery is introduced, which belongs to the field of chemical modification of natural polymer. The preparation method comprises the steps of dispersing sodium carboxymethylcellulose prepared by a slurry method in an organic solvent, adding a hydrochloric acid aqueous solution for mixing, reacting at the temperature of 20-50 ℃, then removing liquid, washing with the organic solvent with the volume concentration of 80-95%, then removing liquid, drying and crushing to obtain carboxymethyl cellulose acid; dispersing carboxymethyl cellulose acid in an organic solvent, adding an aqueous solution of LiOH & H2O, reacting at 40-60 ℃, neutralizing with glacial acetic acid until the pH value is 6-8, washing with an organic solvent with the concentration of 75-85%, removing liquid, drying, and crushing to obtain the lithium carboxymethyl cellulose. By the preparation method, the carboxymethyl cellulose lithium with different degrees of substitution and different viscosities and excellent water solubility can be obtained.
In the patent CN106366203B, a method for preparing low sodium salt lithium carboxymethyl cellulose is introduced. The invention provides a preparation method of lithium carboxymethyl cellulose, which comprises the following steps: A. acidifying: dispersing an acid solution in an organic solvent, and adding sodium carboxymethyl cellulose to obtain a mixed solution 1; reacting at 50-75 ℃, and removing liquid after the reaction is finished to obtain a crude product of carboxymethyl cellulose acid; washing and removing liquid; B. and (3) lithiation: dispersing carboxymethyl cellulose acid in an organic solvent, and adding a LiOH aqueous solution to obtain a mixed solution 2; reacting at 10-40 ℃, neutralizing until the pH is 7-8 after the reaction is finished, and removing the liquid to obtain a crude product of the lithium carboxymethyl cellulose; washing, removing liquid, drying and crushing to obtain the finished product of the lithium carboxymethyl cellulose. The method can prepare the low-sodium-salt lithium carboxymethyl cellulose.
Disclosure of Invention
The invention provides a preparation method of nano-crystalline lithium cellulose for a lithium battery, and aims to solve the problems of environmental pollution and high price of the existing battery binder. The nano-crystalline lithium cellulose has outstanding performance, strong thickening capacity, easy dissolution and dispersion, microscopic three-dimensional network structure in aqueous solution, high mechanical performance, and capability of coating on the surface of lithium battery negative active materials such as graphite to prevent serious quality faults such as pole piece coating cracking and the like.
The invention is realized in such a way that a preparation method of nano-crystalline lithium cellulose for a lithium battery comprises the following steps:
s1, preparing nano cellulose acid:
s101, dispersing sodium nanocellulose prepared by a 2,2,6, 6-tetramethylpiperidine oxide induced catalytic oxidation method in an organic solvent, and adding a hydrochloric acid aqueous solution to obtain a mixed solution;
s102: reacting the mixed solution obtained in the step 1 at the temperature of 20-50 ℃, and then removing the solution to obtain a crude product of the nano cellulose acid;
s103: washing the crude nano-cellulose acid obtained in the step S102 by using an organic solvent with the volume concentration of 80-95%, and then removing liquid, drying and crushing to obtain carboxymethyl cellulose acid;
s2, preparing nano-crystalline lithium cellulose:
s201, dispersing the nano cellulose acid obtained in the step S103 in an organic solvent, and adding LiOH & H2O water solution to obtain mixed solution;
s202: reacting the mixed solution obtained in the step S201 at 40-60 ℃, and neutralizing the reacted solution with glacial acetic acid until the pH value is 6-8 to obtain crude nano-crystalline lithium;
s203: after the crude product of nano-crystalline lithium cellulose obtained in the step S202 is subjected to liquid removal, washing the crude product of nano-crystalline lithium cellulose with an organic solvent with the concentration of 75-85%; removing liquid, drying and crushing to finally obtain the nano-crystalline lithium cellulose.
Preferably, in step S101, the mass concentration of the hydrochloric acid aqueous solution is 15% to 25%, and the weight ratio of the hydrochloric acid aqueous solution to the sodium nanocellulose is 30g to 150 g: 50 g.
Preferably, in step S201, the LiOH · H2O aqueous solution has a mass fraction of 6% to 12%, and LiOH · H2The mol ratio of O to the nano cellulose acid is 2: 1.
Preferably, the organic solvent is one of an ethanol solution, an isopropanol solution and an acetone solution.
Preferably, in step S101, the volume concentration of the organic solvent is 90% to 95%;
the bath ratio of the crude nano cellulose acid to the organic solvent is controlled to be 10-15: 1.
Compared with the prior art, the invention has the beneficial effects that: the invention relates to a preparation method of nano-crystalline cellulose lithium for a lithium battery, which comprises the steps of dispersing sodium nano-crystalline cellulose prepared by a 2,2,6, 6-tetramethyl piperidine oxide induced catalytic oxidation method in an organic solvent, adding a hydrochloric acid aqueous solution for mixing, reacting at 20-50 ℃, then removing liquid, washing with the organic solvent with the volume concentration of 80-95%, then removing liquid, drying and crushing to obtain nano-crystalline cellulose acid. Dispersing nano cellulose acid in an organic solvent, adding an aqueous solution of LiOH & H2O, reacting at 40-60 ℃, neutralizing with glacial acetic acid until the pH value is 6-8, washing with an organic solvent with the concentration of 75-85%, removing liquid, drying and crushing to obtain the nano lithium cellulose. By the preparation method, the nano-crystalline cellulose lithium with different degrees of substitution and different viscosities and excellent water solubility can be obtained, and a novel water-soluble binder with low price and excellent performance is provided for a lithium battery, so that the cycle stability and the discharge capacity of the lithium battery are improved.
Drawings
Fig. 1 is a schematic flow chart of a method for preparing nano-crystalline lithium cellulose for a lithium battery according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a technical solution: a preparation method of nano-crystalline lithium cellulose for a lithium battery comprises the following steps:
s1, preparing nano cellulose acid:
s101, dispersing sodium nanocellulose prepared by a 2,2,6, 6-tetramethylpiperidine oxide induced catalytic oxidation method in an organic solvent, and adding a hydrochloric acid aqueous solution to obtain a mixed solution. The mass concentration of the hydrochloric acid aqueous solution is 15-25%, and the weight ratio of the hydrochloric acid aqueous solution to the sodium nano-cellulose is 30-150 g: 50 g. The volume concentration of the organic solvent is 90-95%. The bath ratio of the crude nano cellulose acid to the organic solvent is controlled to be 10-15: 1.
S102: and (3) reacting the mixed solution obtained in the step (1) at the temperature of 20-50 ℃, and then removing the solution to obtain a crude product of the nano cellulose acid.
S103: and (3) washing the crude nano cellulose acid obtained in the step (S102) by using an organic solvent with the volume concentration of 80-95%, and then removing liquid, drying and crushing to obtain the carboxymethyl cellulose acid.
S2, preparing nano-crystalline lithium cellulose:
s201, dispersing the nano cellulose acid obtained in the step S103 in an organic solvent, and adding a LiOH & H2O aqueous solution to obtain a mixed solution. The mass fraction of the LiOH & H2O aqueous solution is 6% -12%, and the molar ratio of LiOH & H2O to the nano cellulose acid is 2: 1.
S202: and (3) reacting the mixed solution obtained in the step (S201) at 40-60 ℃, and neutralizing the reacted solution with glacial acetic acid until the pH value is 6-8 to obtain crude nano-lithium cellulose.
S203: and (3) after the crude product of the nano-crystalline lithium cellulose obtained in the step (S202) is subjected to liquid removal, washing the crude product of the nano-crystalline lithium cellulose with an organic solvent with the concentration of 75-85%. And then sequentially carrying out liquid removal, drying and crushing treatment on the washed crude nano-crystalline lithium cellulose to finally obtain the nano-crystalline lithium cellulose.
Wherein the organic solvent is one of ethanol solution, isopropanol solution and acetone solution.
In summary, the preparation method of the nano-crystalline cellulose lithium for the lithium battery of the invention comprises the steps of sequentially dispersing the nano-crystalline cellulose sodium prepared by the 2,2,6, 6-tetramethyl piperidine oxide induced catalytic oxidation method in an organic solvent, adding a hydrochloric acid aqueous solution for mixing, reacting at 20-50 ℃, then removing the liquid, washing with the organic solvent with the volume concentration of 80-95%, then removing the liquid, drying and crushing to obtain the nano-crystalline cellulose acid. Dispersing nano cellulose acid in an organic solvent, adding an aqueous solution of LiOH & H2O, reacting at 40-60 ℃, neutralizing with glacial acetic acid until the pH value is 6-8, washing with an organic solvent with the concentration of 75-85%, removing liquid, drying and crushing to obtain the nano lithium cellulose.
In addition, the preparation method of the nano-crystalline lithium cellulose for the lithium battery can obtain the nano-crystalline lithium cellulose with different degrees of substitution and different viscosities and excellent water solubility, and provides a novel water-soluble binder with low price and excellent performance for the lithium battery, thereby improving the cycle stability and the discharge capacity of the lithium battery.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A preparation method of nano-crystalline lithium cellulose for a lithium battery is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing nano cellulose acid:
s101, dispersing sodium nanocellulose prepared by a 2,2,6, 6-tetramethylpiperidine oxide induced catalytic oxidation method in an organic solvent, and adding a hydrochloric acid aqueous solution to obtain a mixed solution;
s102: reacting the mixed solution obtained in the step 1 at the temperature of 20-50 ℃, and then removing the solution to obtain a crude product of the nano cellulose acid;
s103: washing the crude nano-cellulose acid obtained in the step S102 by using an organic solvent with the volume concentration of 80-95%, and then removing liquid, drying and crushing to obtain carboxymethyl cellulose acid;
s2, preparing nano-crystalline lithium cellulose:
s201, dispersing the nano cellulose acid obtained in the step S103 in an organic solvent, and adding LiOH & H2O water solution to obtain mixed solution;
s202: reacting the mixed solution obtained in the step S201 at 40-60 ℃, and neutralizing the reacted solution with glacial acetic acid until the pH value is 6-8 to obtain crude nano-crystalline lithium;
s203: after the crude product of nano-crystalline lithium cellulose obtained in the step S202 is subjected to liquid removal, washing the crude product of nano-crystalline lithium cellulose with an organic solvent with the concentration of 75-85%; removing liquid, drying and crushing to finally obtain the nano-crystalline lithium cellulose.
2. The method for preparing nano-crystalline lithium cellulose for a lithium battery as claimed in claim 1, wherein: in step S101, the mass concentration of the hydrochloric acid aqueous solution is 15-25%, and the weight ratio of the hydrochloric acid aqueous solution to the sodium nanocellulose is 30-150 g: 50 g.
3. The method for preparing nano-crystalline lithium cellulose for a lithium battery as claimed in claim 1, wherein: in step S201, the LiOH H26 to 12 percent of O aqueous solution and LiOH H2The molar ratio of O to the nano-cellulose acid is 2: 1.
4. The method for preparing nano-crystalline lithium cellulose for a lithium battery as claimed in claim 1, wherein: the organic solvent is one of ethanol solution, isopropanol solution and acetone solution.
5. The method for preparing nano-crystalline lithium cellulose for a lithium battery as claimed in claim 1, wherein: in step S101, the volume concentration of the organic solvent is 90-95%;
the bath ratio of the crude nano cellulose acid to the organic solvent is controlled to be 10-15: 1.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116574196A (en) * | 2023-05-15 | 2023-08-11 | 南开大学 | Synthesis method of lithium phosphoryl cellulose nanocrystalline and composite gel electrolyte |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102206286A (en) * | 2011-05-16 | 2011-10-05 | 北京理工大学 | Preparation method of lithium carboxymethyl cellulose for lithium battery |
| CN106366203A (en) * | 2016-08-31 | 2017-02-01 | 泸州北方化学工业有限公司 | Preparation method of low sodium salt carboxymethyl cellulose lithium |
| CN109503723A (en) * | 2018-11-29 | 2019-03-22 | 瑞红锂电池材料(苏州)有限公司 | A kind of preparation method of nanometer of CMCLi |
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- 2020-05-14 CN CN202010404923.9A patent/CN111533815A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102206286A (en) * | 2011-05-16 | 2011-10-05 | 北京理工大学 | Preparation method of lithium carboxymethyl cellulose for lithium battery |
| CN106366203A (en) * | 2016-08-31 | 2017-02-01 | 泸州北方化学工业有限公司 | Preparation method of low sodium salt carboxymethyl cellulose lithium |
| CN109503723A (en) * | 2018-11-29 | 2019-03-22 | 瑞红锂电池材料(苏州)有限公司 | A kind of preparation method of nanometer of CMCLi |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116574196A (en) * | 2023-05-15 | 2023-08-11 | 南开大学 | Synthesis method of lithium phosphoryl cellulose nanocrystalline and composite gel electrolyte |
| CN116574196B (en) * | 2023-05-15 | 2024-04-16 | 南开大学 | Synthesis method of lithium phosphoryl cellulose nanocrystalline and composite gel electrolyte |
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