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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
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  • 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 be equipped with a special mercury porosimeter, which is expensive; and because the test reagent is mercury, and mercury is a heavy metal pollutant with strong biological toxicity in the environment, it is difficult to be discharged after entering the organism, which seriously threatens human health , so it is very harmful to the operator and the environment

Method used

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  • 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

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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] ...

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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

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Application Information

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IPC IPC(8): G01N15/08
Inventor 李慧芳马佳鑫高俊奎
Owner TIANJIN LISHEN BATTERY
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