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Method and apparatus for measuring bonding force between graphite and binder of negative electrode of lithium battery

A measurement method and technology of measurement equipment, applied in the direction of measurement devices, secondary batteries, circuits, etc., can solve the problems of difficulty in accurately evaluating the bonding force between graphite and binder, high evaluation cost, and long evaluation cycle, and achieve shortening The product development cycle, the effect of improving the production efficiency of enterprises and reducing the cost of R&D and production

Inactive Publication Date: 2017-05-10
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main methods used by various lithium battery manufacturers and research institutes to evaluate the adhesion of lithium battery negative electrode sheets are through the "peeling method" or "grid drawing method", which require the preparation of the negative electrode through pulping, coating, rolling and other processes. sheet, the process is complicated and there are many influencing factors, the evaluation cycle is long and the evaluation cost is high, it is difficult to accurately evaluate the bonding force between graphite and binder

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  • Method and apparatus for measuring bonding force between graphite and binder of negative electrode of lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The method for measuring the cohesive force between lithium battery negative electrode graphite and binder by using the above-mentioned equipment comprises the following steps:

[0047] Step 1: 96 parts (parts by weight, the same below) of graphite and 2 parts (parts by weight, the same below) of CMC are put into the soaking tank and fully stirred and mixed for 30 minutes. The rotating speed of the soaking tank is 20 rpm, and the volume of the soaking tank is 2L.

[0048] Step 2: put the mixed graphite into a hydroforming device and process it into flake graphite block, put the flake graphite block into the binder forming mold, and then spread 2 parts (parts by weight, the same below) SBR on The surface of the graphite block is heated and dried to evaporate the solvent component in the SBR, so that the surface of the graphite block forms an adhesive film to obtain the sample to be tested;

[0049] Among them, the boosting speed of the hydroforming device is 2T / h, and th...

Embodiment 2

[0053] The method for measuring the cohesive force between lithium battery negative electrode graphite and binder by using the above-mentioned equipment comprises the following steps:

[0054] Step 1: Put 95 parts of graphite and 2 parts of CMC into the soaking tank and stir and mix for 30 minutes. The speed of the soaking tank is 20 rpm, and the volume of the soaking tank is 2L.

[0055] Step 2: Put the uniformly mixed graphite into a hydroforming device and process it into a flake graphite block, put the flake graphite block into a binder forming mold, and then spread 3 parts of SBR on the surface of the graphite block and heat and dry it Evaporate the solvent components in the SBR to form a binder film on the surface of the graphite block to obtain the sample to be tested;

[0056] Among them, the boosting speed of the hydroforming device is 2T / h, and the stroke speed is 2m / h. In this step, the temperature for heating the sheet-packed graphite block spread with SBR is 40° ...

Embodiment 3

[0060] The method for measuring the cohesive force between lithium battery negative electrode graphite and binder by using the above-mentioned equipment comprises the following steps:

[0061] Step 1: Put 95.5 parts of graphite and 2 parts of CMC into the soaking tank and stir and mix for 30 minutes. The speed of the soaking tank is 20 rpm, and the volume of the soaking tank is 2L.

[0062] Step 2: Put the uniformly mixed graphite into a hydroforming device and process it into a flake graphite block, put the flake graphite block into a binder forming mold, and then spread 2.5 parts of SBR on the surface of the graphite block and heat and dry it Evaporate the solvent components in the SBR to form a binder film on the surface of the graphite block to obtain the sample to be tested;

[0063] Among them, the boosting speed of the hydroforming device is 2T / h, and the stroke speed is 2m / h. In this step, the temperature for heating the sheet-packed graphite block spread with SBR is ...

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Abstract

The invention provides a method and apparatus for measuring bonding force between the graphite and binder of a negative electrode of a lithium battery. The measuring method comprises the following steps: step 1, putting the graphite of the negative electrode of the lithium battery and an impregnating compound into an impregnating tank for full mixing under stirring; step 2, putting uniformly mixed graphite into a hydraulic forming device for processing of a flaky graphite block, coating the surface of the flaky graphite block with the binder, then carrying out heating to evaporate a solvent component in the binder and allowing a binder film to be formed on the surface of the flaky graphite block so as to obtain a to-be-measured sample; and step 3, putting the to-be-measured sample into a pulling force testing device to measure peel strength of the binder film and the flaky graphite block so as to obtain the bonding force between the graphite and binder of the negative electrode. The measuring method and apparatus provided by the invention can efficiently, rapidly and accurately measure bonding force between graphite and binders of different types or between graphite and the binder in different ratios without slurrying through stirring, coating, baking and rolling.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a method and equipment for measuring the cohesive force between lithium battery negative electrode graphite and a binder. Background technique [0002] With global warming and environmental pollution intensifying, the development of clean and environment-friendly energy has become a major energy strategy actively advocated and promoted by governments of all countries. Especially in developed countries and developing countries with international influence, on the one hand, guide the society to develop clean renewable energy through industry regulations, and on the other hand, encourage new energy companies to increase R&D investment and production in the field of new energy through active fiscal policies. out. At present, China is in the policy guidance and encouragement period for the government to actively promote the new energy industry. The national and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04H01M10/0525
CPCG01N19/04H01M10/0525Y02E60/10
Inventor 兰建云冯树南从长杰
Owner TIANJIN ENERGIES