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Method for quickly and efficiently testing liquid absorptivity of pole piece

A technology of liquid absorption rate and pole piece, which is applied in the field of lithium battery process material testing, can solve the problems of inaccurate reflection of the liquid absorption rate of the pole piece, high requirements for container sealing, long soaking time, etc., and achieve fast infiltration and diffusion speed, Overcoming the time-consuming effect of shortening the time for aspiration

Inactive Publication Date: 2017-06-09
ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method takes a long time to soak, requires high sealing of the container, and the electrolyte volatilizes very quickly. The weighing error of the pole piece after soaking is large, and the liquid absorption rate of the pole piece cannot be accurately reflected, and the organic solvent and electrolyte in the electrolyte solution will affect the human body. Cause potential harm, the electrolyte after soaking is also polluting the environment, and it is troublesome to deal with

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for quickly and efficiently testing the liquid absorption rate of a pole piece, comprising the following steps:

[0026] a) Take a pole piece sample with a size of 50mm*100mm and weigh its mass M 0 ;The pole piece sample is rectangular;

[0027] b), put the weighed electrode sample into the container; the container has a cover and a hole;

[0028] c), pour 200g of analytically pure octadecane into the container, and immerse the pole piece sample;

[0029] d) Put the container into a vacuum drying oven, set the temperature at 40°C, vacuumize to -0.090Mpa, and keep it for 15 minutes;

[0030] e) Take out the pole piece, use filter paper to wipe off the free infiltration solution on the surface of the pole piece sample, and weigh its mass M 1 ;

[0031] f), calculate liquid absorption ε=(M 1 -M 0 ) / M 0 ;Electrolyte retention volume M=ε*M 0 *ρ 1 / ρ 2 where ρ 1 Electrolyte density, ρ 2 is the density of octadecane.

Embodiment 2

[0033] A method for quickly and efficiently testing the liquid absorption rate of a pole piece, comprising the following steps:

[0034] a) Take a pole piece sample with a size of 60mm*100mm and weigh its mass M 0 ;The pole piece sample is rectangular;

[0035] b), put the weighed electrode sample into the container; the container has a cover and a hole;

[0036] c), pour 250g of analytically pure octadecane into the container, and immerse the pole piece sample;

[0037] d) Put the container into a vacuum drying oven, set the temperature at 45°C, vacuumize to -0.095Mpa, and keep it for 18 minutes;

[0038] e) Take out the pole piece, use filter paper to wipe off the free infiltration solution on the surface of the pole piece sample, and weigh its mass M 1 ;

[0039] f), calculate liquid absorption ε=(M 1 -M 0 ) / M 0 ;Electrolyte retention volume M=ε*M 0 *ρ 1 / ρ 2 where ρ 1 Electrolyte density, ρ 2 is the density of octadecane.

Embodiment 3

[0041] A method for quickly and efficiently testing the liquid absorption rate of a pole piece, comprising the following steps:

[0042] a) Take a pole piece sample with a size of 60mm*120mm and weigh its mass M 0 ;The pole piece sample is rectangular;

[0043] b), put the weighed electrode sample into the container; the container has a cover and a hole;

[0044] c), pour 300g of analytically pure octadecane into the container, and immerse the pole piece sample;

[0045] d) Put the container into a vacuum drying oven, set the temperature at 50°C, vacuumize to -0.090Mpa, and keep it for 20 minutes;

[0046] e) Take out the pole piece, use filter paper to wipe off the free infiltration solution on the surface of the pole piece sample, and weigh its mass M 1 ;

[0047] f), calculate liquid absorption ε=(M 1 -M 0 ) / M 0 ;Electrolyte retention volume M=ε*M 0 *ρ 1 / ρ 2 where ρ 1 Electrolyte density, ρ 2 is the density of octadecane.

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Abstract

The invention relates to a method for quickly and efficiently testing liquid absorptivity of a pole piece. The method comprises the following steps: cutting a pole piece sample, and weighing the pole piece sample to obtain the mass M0; putting the weighed pole piece sample into a container; pouring a soaking solution into the container, and immersing the pole piece sample; putting the container into a vacuum drying oven, and keeping for 15-20 minutes; taking out the pole piece, wiping the free soaking solution on the surface of the pole piece sample by using filter paper, and weighing the pole piece sample to obtain the mass M1; and calculating the liquid absorptivity epsilon=(M1-M0) / M0 and the electrolyte maintenance dose M=epsilon*M0*rho1 / rho2, wherein rho1 is the electrolyte concentration, and rho2 is the density of the soaking solution. The used octadecane has the advantages of high stability, high flash point and low volatility, is hydrophobic, and thus, is suitable to be used as a solvent for soaking the pole piece. The method overcomes the defects of long time consumption, big measurement errors, great environmental pollution caused by the electrolyte and potential hazards to the operating personnel when the electrolyte is used for soaking the pole piece and testing the liquid absorptivity in the past.

Description

technical field [0001] The invention belongs to the field of lithium battery process material testing, and more specifically relates to a method for testing the liquid absorption rate of a pole piece. Background technique [0002] The liquid absorption rate refers to the ratio of the amount of electrolyte absorbed by the micropores of the pole piece to the weight of the pole piece itself. The liquid absorption rate is closely related to the shape and structure of the internal particles of the pole piece, and directly reflects the liquid retention capacity of the pole piece. The battery design and production process provide the basis. [0003] The pole piece is mixed and added to the solvent by active material, binder, and conductive agent in a certain proportion, and the proportion of active material is generally more than 90%. It is stirred and dispersed, then coated on the current collector and dried, and then rolled It is made by die-cutting, so the surface state and int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/02
CPCG01N5/02
Inventor 苏锋任宁李洪涛童祥黄忠杰孙延先
Owner ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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