Testing method for effective pore volume and porosity of lithium ion battery pole piece

A test method, pore volume technology, applied in the direction of measuring devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve problems such as expensive equipment, threats to human health, operators and environmental hazards, and achieve easy The production and test methods are simple and reliable, and the effect is easy to promote

Active Publication Date: 2013-09-04
TIANJIN LISHEN BATTERY +1
View PDF4 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the mercury porosity method is mostly used to test the porosity of the pole piece. This method is mainly to press mercury into the pores of the pole piece under the condition of gradually increasing the pressure, and calculate the porosity of the pole piece according to the amount of mercury injected. This test The method needs to b...

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
  • Testing method for effective pore volume and porosity of lithium ion battery pole piece
  • Testing method for effective pore volume and porosity of lithium ion battery pole piece
  • Testing method for effective pore volume and porosity of lithium ion battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In this example, the effective pore volume and porosity of lithium-ion battery cathode sheets with different compacted thicknesses were tested, and compared with the mercury porosimetry test data. The mercury porosimeter used was Autopore Ⅳ 9500 from American Mike Company, and the digitally controlled ultrasonic cleaner was KQ2200DE from Kunshan Ultrasonic Instrument Co., Ltd.

[0019] Take the positive electrode sheet of the lithium-ion battery to be tested, the compacted thicknesses are respectively: 98 μm and 102 μm, and dry them in a vacuum oven. First take a sample of 98 μm for testing: cut two samples with a length of 16 cm from the pole piece, and the width is the original width of the pole piece, which are recorded as S1 and S2 respectively, wipe the surface with a soft cloth, and weigh the mass with an analytical balance Recorded as m1 and m2, recorded in Table 1.

[0020] Table 1 Test results of effective pore volume and porosity of pole pieces

[0021] ...

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

No PUM Login to view more

Abstract

The invention discloses a testing method for effective pore volume and porosity of a lithium ion battery pole piece. The effective pore volume and porosity of the pole piece is calculated by testing a pore-containing total volume and an actual volume of the pore filled by a liquid, of the pole piece. The testing method is carried out according to the following steps of firstly testing a pore-containing total volume (Vt) of the pole piece and then testing the actual volume (Vz) of the pole piece. The calculation methods for the effective pore volume and the effective porosity are described in the specification. The testing method is in no need of large-scale equipment; the testing device can be manufactured easily; the used reagent is non-toxic and harmless; and the testing method is simple and reliable and is convenient for popularization.

Description

technical field [0001] The invention relates to a method for testing the effective pore volume and porosity of a lithium-ion battery pole piece. Background technique [0002] In the manufacturing process of lithium-ion batteries, especially lithium-ion power batteries, the porosity of the pole piece has a great influence on the performance of the battery. Experiments have proved that porosity is closely related to specific capacity, efficiency, internal resistance, and battery cycle performance. Finding the optimal porosity of the pole piece is very important for battery design. Zhang Zhengming, an expert in the lithium battery industry, has emphasized the impact of porous electrodes on battery performance at several meetings. Appropriate pole piece porosity can provide more free channels for the insertion and extraction of lithium ions, which can increase the discharge capacity of the battery and reduce the Internal resistance, reducing polarization loss, prolonging the cy...

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): G01N15/08
Inventor 李慧芳马佳鑫高俊奎
Owner TIANJIN LISHEN BATTERY
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