Simple sulphur-based solid electrolyte conductivity test method

Abstract

The invention discloses a simple sulphur-based solid electrolyte conductivity test method. Piece lamination is performed according to the order of porous metal base material, sulphur-based solid electrolyte powder and porous metal base material from the bottom to the top in an anhydrous environment, wherein the size of the lower porous metal base material is greater than that of the upper porous metal base material, the exposed sulphur-based solid electrolyte in the laminated piece is sealed, and impedance value testing is performed on the laminated piece by adopting an electrochemical work station; and impedance of the solid electrolyte laminated piece is determined according to an AC impedance diagram, and conductivity is calculated. Common materials and instruments are used, and solid electrolyte conductivity testing can be performed by the simple method so that contact between a sample to be tested and a blocking electrode is compact, and repeatability of sample testing is great.

Description

Technical field [0001] The invention relates to a conductivity test method, in particular to a simple and convenient test method for the conductivity of a sulfur-based solid electrolyte. Background technique [0002] The core of the power plant of a new energy vehicle is the power battery. In addition to energy density, voltage, cycle life and other parameters that have higher requirements, safety is the primary condition of the power battery. Traditional lithium-ion batteries use organic solvent electrolytes, which are prone to fire and explosion under abuse conditions. The use of solid electrolytes is the fundamental way to solve safety problems. At present, solid electrolytes include polymer solid electrolytes and inorganic solid electrolytes, the most important indicator of which is electrical conductivity. [0003] The usual method for testing electrical conductivity is to make a solid electrolyte into a test piece with a certain thickness and area, add blocking electrodes on...

AI Technical Summary

Problems solved by technology

Sulfur-based solid electrolytes will undergo crystal structure changes at high temperatures. The annealed silver colloid method cannot be used, and ion sputtering often causes short circuits and requires high equipment.

[0004] Patent Publication No. CN102323453A discloses a fixture for conductivity testing and its assembly method. The conductivity test is completed by selecting different clamping modules for different test objects. Patent Publication No. CN201191307Y discloses a measurement device for solid electrolyte thin films. Achieving multiple samples to be tested and comparative samples to test conductivity in the same environment, but the device is complicated and the test is troublesome; Patent Publication No. CN204330723U discloses a device for testing the performance of solid electrolytes, which uses a double helix structure to seal and act as a blocking electrode test

Although the above patents can test the conductivity of solid electrolytes, it is difficult to achieve molecular-level contact between blocking electrodes and solid electrolytes with these technologies, resulting in large interface resistance and affecting the accuracy of test results. At the same time, some technologies cannot guarantee the isolation of solid electrolytes Moisture affects test accuracy and requires complex equipment