Test method of lithium ion battery slurry viscoelasticity

A lithium-ion battery and testing method technology, which is applied in the field of viscoelasticity testing of lithium-ion battery slurry, can solve problems such as instability of viscoelasticity test data, influence of coating characteristics, etc., and achieve simple operation and good repeatability

Active Publication Date: 2019-04-05
SVOLT ENERGY TECHNOLOGY CO LTD
View PDF10 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of the influence of the lithium ion battery slurry on the coating characteristics during the coating process due to the instability of the slurry viscoelasticity test data during the coating of the lithium ion battery slurry, and provides A test method for the viscoelasti...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Test method of lithium ion battery slurry viscoelasticity
  • Test method of lithium ion battery slurry viscoelasticity
  • Test method of lithium ion battery slurry viscoelasticity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] According to this embodiment figure 1 The process shown is carried out. Specifically, take the slurry A of the positive electrode material of the lithium ion battery (NCM:SP:PVDF is mixed in a mass ratio of 96:2:2, the same below), stir for 10 minutes and mix, and then add the sample to the In the rheometer, stand still for 10 minutes. At this time, the temperature of the slurry is constant at 25°C±0.5°C. Start the rotation module of the rheometer for rotation processing. The rotation processing process includes: 100s at the first shear rate -1 Rotate the rotor for 5min, then at the second shear rate 00.01s -1 Rotate the rotor for 15 minutes, close the rotary module of the dynamic rheometer, and obtain the processed sample; start the vibration module of the rheometer, and perform a vibration test. The vibration test process includes: setting the range of the shear strain to 0.1%- 101%, and take 19 points by the method of logarithmically divided points, record the shear...

Embodiment 2

[0049] Carry out according to the method of embodiment 1, difference is: add sample to rheometer through spatula.

[0050] The results of this embodiment are shown in Table 2 and image 3 shown by Table 2 and image 3 It can be seen that in this example, the maximum value of the storage modulus representing the elasticity of the slurry is 21.597Pa, the maximum value of the loss modulus representing the viscosity of the slurry is 24.252Pa, and the torque parameter (greater than 1 μN m) reflects The accuracy of the data illustrates the accuracy of the viscoelasticity data in this example.

[0051] Table 2

[0052] data point number

Embodiment 3

[0054] Repeat the operation according to the method of Example 1.

[0055] The results of this embodiment are shown in Table 3 and Figure 4 shown by Table 3 and Figure 4 It can be seen that in this embodiment, the maximum value of the storage modulus representing the elasticity of the slurry is 21.683Pa, the maximum value of the loss modulus representing the viscosity of the slurry is 24.272Pa, and the torque parameter (greater than 1 μN m) reflects The accuracy of the data illustrates the accuracy of the viscoelasticity data in this example.

[0056] table 3

[0057]

[0058]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Storage modulusaaaaaaaaaa
Loss modulusaaaaaaaaaa
Storage modulusaaaaaaaaaa
Login to view more

Abstract

The invention relates to the field of a lithium ion battery, and discloses a test method of lithium ion battery slurry viscoelasticity. The method comprises the following steps of (1) performing stillstanding and constant temperature treatment on lithium ion battery slurry before test to obtain a sample to be tested; (2) contacting a rotor of a rheometer with the sample to be tested; performing rotating treatment to obtain a treated sample; and (3) performing oscillation test on the treated sample by using the rotor of the rheometer; setting different shearing strain; measuring an energy storage modulus and a loss modulus corresponding to each shearing strain; expressing the slurry elasticity by using the maximum value of the energy storage modulus; and expressing the slurry viscosity bythe maximum value of the loss modulus, wherein the rotating treatment process comprises the steps of rotating the rotor for 4 to 8 min at the first shearing speed of 80 to 120 s<-1>, and then rotatingthe rotor for 10 to 20 min at the second shearing speed of 0.005 to 0.02s<-1>. By using the method provided by the invention, after the multi-time measurement on the same slurry, viscoelasticity datawith high repeated performance and high accuracy can be provided.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a method for testing the viscoelasticity of a lithium ion battery slurry. Background technique [0002] With the depletion of traditional energy sources and the increasingly prominent environmental problems, the development direction of lithium-ion batteries as a new type of clean energy has attracted more and more attention from governments and scientists, and they are constantly committed to the development and research of more practical and efficient lithium-ion batteries. In the preparation process of lithium-ion batteries, the quality of the slurry occupies a crucial position, which will directly affect the process and quality of the subsequent lithium-ion battery production, so the slurry with excellent performance is the foundation of the preparation of lithium-ion batteries. At present, the industry only tests the viscous state of the slurry. As a viscoelastic liquid, the elastic ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N11/14
CPCG01N11/14
Inventor 何凡刘小安朴明权邱志云杨树涛马旭强
Owner SVOLT ENERGY TECHNOLOGY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap