Electrochemical performance testing device

Abstract

The present application relates to an electrochemical performance testing device, including an electrochemical system, a driving system, a visualization system, and a control system, wherein the electrochemical system includes an electrolyte tank, a first electrode, a second electrode, and an electrochemical workstation. The electrolyte tank is for holding the electrolyte. One end of the first electrode is immersed in the electrolyte tank, and is in contact with the particles to be tested, and the other end of the first electrode is electrically connected to the electrochemical workstation. One end of the second electrode is immersed in the electrolyte tank while the other end of the second electrode is electrically connected to the electrochemical workstation, and the driving system is connected to the first electrode so as to drive the first electrode to contact the particle to be tested. The visualization system is used for observing the particles to be tested. The control system iselectrically coupled to the electrochemical system, the driving system, and the visualization system. The testing device enables the testing of single particles of the active material, thereby improving the accuracy of the electrochemical performance test of the active material.

Description

technical field [0001] The present application relates to the technical field of electrochemical performance testing, in particular to an electrochemical performance testing device. Background technique [0002] With the development of the new energy industry, consumers have put forward new requirements for batteries (such as lithium batteries) in terms of safety, cost, life, energy density, and power density. For example, the power battery for electric vehicles The requirement for energy density is getting higher and higher, therefore, it is particularly important to select new electrode materials that meet the requirements. At present, a variety of new electrode active materials have attracted people's attention, for example, LiFePO with high safety 4 , LiMg x Fe1 -x PO 4 (0<x<1) and other polyanionic positive electrode materials, high voltage LiNi 0.5 mn 1.5 o 4 Cathode materials, lithium-rich manganese-based cathode materials with high specific capacity, Si-...

AI Technical Summary

Problems solved by technology

[0004] In the above electrochemical performance test, the binder and the conductive agent may have some side reactions during the test process, such as binder degradation, electrolyte decomposition, etc. The above side reactions will affect the reliability of the electrochemical performance test and cannot Accurately obtain intrinsic properties of materials

In addition, the composite electrode is essentially a porous electrode, and there are defects such as uneven size distribution, uneven concentration distribution of reactants and products, uneven potential and current density distribution, etc. These defects will affect the accuracy of the measurement results.

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