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Method for measuring bonding strength of granules of pole piece active material layer

A technology of active material layer and bond strength, which is applied in the direction of analyzing materials, measuring devices, and weighing by removing certain components, can solve the problem of inability to detect the bond strength of active particles in the active material layer, and achieve accuracy high effect

Inactive Publication Date: 2009-11-18
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses ultrasonic waves to oscillate the pole piece, so that the active material layer of the pole piece is separated from the current collector, and the material loss of the pole piece is used to indicate the strength of the pole piece dressing. The disadvantage of this method is that it can only measure the active material layer and the current collector. The bond strength between fluids, while the bond strength of the active particles in the active material layer cannot be detected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 A negative electrode sheet for measuring the bonding strength of active material layer particles was prepared.

[0020] 1.0 parts by weight of sodium carboxymethylcellulose (CMC) is dissolved in 110 parts by weight of deionized water, then 100 parts by weight of negative electrode active material natural graphite is added to the solution, fully mixed, and finally 3.0 parts by weight of Styrene-butadiene rubber (SBR) emulsion was made into slurry. The slurry was evenly coated on both sides of a 0.016 mm copper foil, dried at 120° C., and rolled to obtain an experimental negative electrode sheet.

Embodiment 2-5

[0022] Examples 2-5 Prepare negative electrode sheets for measuring the bonding strength of active material layer particles.

[0023] According to the same method as in Example 1, the experimental negative electrode sheet was made, except that the weight ratios of natural graphite, sodium carboxymethyl cellulose, styrene-butadiene rubber and deionized water were 100: 1.5: 3.0: 110; 100 :2.0:3.0:110; 100:2.5:3.0:110 and 100:3.0:3.0:110.

Embodiment 6

[0025] Example 6 A positive electrode sheet for measuring the bonding strength of the active material layer particles was prepared.

[0026] 100 parts by weight of LiCoO 2 , 2.0 parts by weight of binder polyvinylidene fluoride (PVDF), 4.5 parts by weight of conductive agent acetylene black are added in 70 parts by weight of N-methylpyrrolidone (NMP), then stirred in a vacuum mixer to form a uniform positive electrode slurry . The slurry was evenly coated on both sides of a 0.016 mm aluminum foil, then dried at 120° C. and rolled to make an experimental positive electrode sheet.

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PUM

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Abstract

The invention provides a method for measuring the bonding strength of granules of a pole piece active material layer, which comprises the following steps: the pole piece active material layer is rubbed so as to ensure that materials drop from the active material layer ; and the bonding strength of the granules of the pole piece active material layer is expressed through a material dropping quantity under a constant rubbing condition. In the method provided by the invention, the pole piece active material layer is rubbed so as to ensure that materials drop from the active material layer, and the bonding strength of the granules of the pole piece active material layer is expressed through the material dropping quantity. The method is simple and convenient, has high accuracy and solves the problem of detecting the bonding strength of the granules of the pole piece active material layer.

Description

technical field [0001] The invention relates to a method for measuring the bonding strength of particles in an active material layer of a pole piece. Background technique [0002] The pole piece of the lithium-ion battery includes a current collector and an active material layer coated and / or filled on the current collector. The bond strength of the pole piece includes two aspects, that is, the bond strength between the active material layer and the current collector , and the bond strength of the particles in the active material layer. [0003] The low bonding strength of the pole piece will lead to material loss of the pole piece during processing and during the charge-discharge cycle after the battery is made. There are also two cases of falling material, one is the separation between the active material layer and the current collector, and the other is the separation of particles in the active material layer. The material falling off of the pole piece will reduce the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04G01N5/04
Inventor 刘峰赵磊刁家喜王炜娜
Owner BYD CO LTD