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Method for testing content of insoluble substances in carboxymethylcellulose glue solution for lithium ion battery

A technology of carboxymethyl cellulose and lithium-ion batteries, which is applied in the field of testing the insoluble content of carboxymethyl cellulose glue for lithium-ion batteries, and can solve the problems of coating consistency, affecting battery consistency, unfavorable screening and Coating and other issues, to achieve the effect of rigorous method and strong persuasion

Inactive Publication Date: 2018-10-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The side reactions that may occur during the synthesis process, the amount of solvents, raw materials, production processes, etc. may introduce insolubles. The existence of insolubles in the glue is not conducive to sieving and coating. If it is introduced into the negative electrode slurry, it will be negative. The consistency of coating has a great influence, which in turn will affect the consistency of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for testing the content of carboxymethyl cellulose glue insolubles for lithium ion batteries, comprising the steps of:

[0021] S1. Stir and dissolve 35g of carboxymethyl cellulose in 465g of deionized water, the stirring speed is 500r / min, the stirring time is 4h, and stand for defoaming for 5h to obtain a transparent glue with a viscosity of 1500mPaS;

[0022] S2. Draw a line on the transparent polystyrene sheet to form a square with a side length of 1 cm, and coat the transparent glue on the surface of the transparent polystyrene sheet;

[0023] S3. Place the transparent polystyrene sheet coated with transparent glue on the transparent glass, and use a group of lampposts to irradiate the light through the transparent glass on the transparent polystyrene sheet coated with transparent glue. Measure Number of insoluble particles in each square.

Embodiment 2

[0025] A method for testing the content of carboxymethyl cellulose glue insolubles for lithium ion batteries, comprising the steps of:

[0026] S1, stirring and dissolving 15 g of carboxymethyl cellulose in 485 g of deionized water, the stirring speed was 1500 r / min, the stirring time was 2 h, and left to defoam for 10 h to obtain a transparent glue with a viscosity of 3000 mPaS;

[0027] S2. Draw a line on a transparent acrylonitrile-butadiene-styrene copolymer sheet to form a square with a side length of 2 cm, and use a scraper with a toothed cutter head to scrape and coat the transparent glue on the transparent acrylonitrile-butadiene-styrene copolymer sheet. On the surface of ethylene-styrene copolymer sheet, the tooth pitch of the scraper is 400 μm;

[0028] S3. Place the transparent acrylonitrile-butadiene-styrene copolymer thin plate coated with transparent glue on the transparent glass, and use a group of lampposts to illuminate, and the light is irradiated on the tran...

Embodiment 3

[0030] A method for testing the content of carboxymethyl cellulose glue insolubles for lithium ion batteries, comprising the steps of:

[0031] S1. Stir and dissolve 5 g of carboxymethyl cellulose in 495 g of deionized water at a stirring speed of 1000 r / min for 2.5 h, then place it in a water bath at 25°C for 6 h to defoam, and obtain a transparent glue;

[0032] S2. Draw a line on a 20×20cm transparent polymethyl methacrylate sheet to form a square with a side length of 1.5 cm. Use a scraper with a toothed blade to scrape and coat the transparent glue on the surface of the plastic sheet. The scraper The tooth pitch is 100μm;

[0033] S3. Place the transparent polymethyl methacrylate sheet coated with transparent glue on the transparent glass, and use a group of lampposts to irradiate the light through the transparent glass on the transparent polymethyl methacrylate coated with transparent glue On the methyl ester sheet, measure the number of insoluble particles in each squa...

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Abstract

The invention discloses a method for testing the content of insoluble substances in a carboxymethylcellulose glue solution for a lithium ion battery. The method comprises the following steps that carboxymethylcellulose is stirred and dissolved in deionized water; still standing and defoaming are performed to obtain a transparent glue solution; lineation is performed on a high-transparency plasticthin plate to form square grids; the transparent glue solution is coated on the surface of the plastic thin plate; the plastic thin plate coated with the transparent glue solution is put into transparent glass; a group of lamp posts are used for irradiation; lamplight is irradiated on the plastic thin plate coated with the transparent glue solution through the transparent glass; the number of insoluble substance particles in each square grid is measured. Compared with the traditional visual inspection, the method has the advantages that the quantitative standard is reached; the method is rigorous; the persuasion is high; the powerful data support is provided for judging whether the glue solution quality is high or low.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for testing the insoluble content of carboxymethyl cellulose glue used in lithium ion batteries. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, long cycle life, no memory effect, safety, reliability, and fast charging and discharging, so they have become a research hotspot. Lithium-ion battery negative electrode materials include negative electrode active materials, binders, and conductive agents. Among them, the binder often adopts a synergistic system composed of carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR), and carboxymethyl cellulose (CMC) plays the role of thickening and anti-sedimentation in the negative electrode slurry . [0003] The synthesis process of carboxymethyl cellulose (CMC) is mainly divided into two steps: first, cellulose reacts with sodium hydroxide to form alk...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/10
CPCG01N15/10G01N2015/1024
Inventor 杨亚冬樊少娟郑刚
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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