A kind of electroplating preparation method of lithium ion battery with reference electrode

Abstract

The invention relates to a preparation method of a lithium ion battery with a reference electrode, and belongs to the technical field of electrode potential detection and electrode production. The reference electrode can be inserted into the battery in advance, and then the metal lithium is electroplated on the reference electrode by electroplating, or the electrolytic cell and other equipment are used to complete the electroplating of the reference electrode, and then inserted into the battery to complete the electroplating process with the reference electrode. Three-electrode cell fabrication with specific electrodes. The method preserves the porous property of the substrate while electroplating metal lithium on the surface of the substrate, so that small molecules in the electrolytic solution can pass through the pores. At the same time, the coating thickness of the lithium layer on the substrate can be controlled to ensure that the porous nature of the substrate material is preserved, and at the same time, the material is loaded with enough lithium to meet the test requirements. The reference electrode prepared by the method has a long service life, and the manufacturing process is simple, which meets the requirements of industrial production, and makes the industrial production and application of the lithium ion battery with the reference electrode possible.

Description

technical field [0001] The invention relates to an electroplating preparation method of a lithium ion battery with a reference electrode, and belongs to the technical field of electrode potential detection and electrode production. Background technique [0002] Electrode potential is a very important parameter in the research technology of electrochemistry and battery. The electrode potential in a thermodynamic equilibrium state is the open circuit potential. In practical applications, the voltage-SOC curve obtained by charging and discharging with a small current can be approximately considered to be the open circuit voltage curve of the battery. When a current flows through the electrodes, the electrodes are polarized, and the electrode potential shifts due to the generation of an overpotential. By measuring the potential change curve of a single electrode, the detailed information of the internal reaction of the electrode can be obtained. For example, for lithium-ion ba...

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Problems solved by technology

However, this physical connection method is difficult to ensure that the connection between lithium and copper is firm. If the connection is poor, the ohmic resistance of the reference electrode will be extremely large, which will affect the use of the reference electrode.

[0005] In summary, the current development dilemma of the reference electrode is mainly caused by the lithium content of the electrode: in order to reduce the barrier effect of the reference on lithium ions in the electrolyte, the size of the reference electrode must be reduced as much as possible, but the overall content of the material will be reduced. The amount of lithium is less, the signal is weak, and it is easy to cause electrode loss or potential drift due to the measurement of micro current

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