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Three-electrode battery

A three-electrode and battery technology, which is applied in the direction of secondary batteries, circuits, non-aqueous electrolyte battery electrodes, etc., can solve the problems of potential drift, difficulty in fixing the internal position of copper wire batteries, and complicated operation, so as to improve stability and facilitate large-scale operation. Large-scale production or mass production, the effect of simple operation

Inactive Publication Date: 2020-12-08
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the existing patent, copper wire is selected as the third electrode potential material, and the copper wire and the tab with tab glue (commonly made of aluminum) are welded together by welding. This method is complicated to operate and there are copper wires The internal position of the battery is difficult to fix, and the signal monitoring is inaccurate. For example, the three electrodes made of electroplated lithium often have potential drift and lithium metal loss during the test process, resulting in unreliable data.

Method used

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Examples

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Embodiment 1

[0048] 1. Preparation of two-electrode lithium-ion battery

[0049] The preparation method of the two-electrode lithium-ion battery is not particularly limited, and mature methods in the art can be used. According to a specific example of the present invention, this step may include:

[0050] (1) Preparation of positive pole piece

[0051] The active material of the positive pole piece is nickel-cobalt lithium manganese oxide (NCM811), and the mass ratio of the formula nickel-cobalt lithium manganese oxide (NCM811), binder polyvinylidene fluoride (PVDF), and conductive agent LITX300 is 94.5:2:3.5. The three materials were put into a 50L stirring tank in proportion and stirred evenly, and then N-methylpyrrolidone (NMP) was added to prepare the positive electrode slurry, and the solid content of the slurry was adjusted to be 64%±2%. When the slurry has a viscosity range of 5000±1000MPa and a fineness of 10-30μm, it is discharged, and the slurry is coated on an aluminum foil wi...

Embodiment 2

[0062] Adopt the data collector of KEYSIGHT company to carry out data collection to the three-electrode battery prepared in embodiment 1, Figure 7 It is the data collected by the equipment after one charge and discharge cycle of the battery. The positive electrode potential in the figure is the potential of the positive electrode to the third electrode (metal lithium); the negative electrode potential is the potential change curve of the negative electrode to metal lithium; . This data accurately feeds back the potential changes during the charging and discharging process of metal lithium on ternary positive electrode materials and graphite negative electrode materials, and can accurately collect potential changes at different current densities, which further proves that the three-electrode data prepared by this patent method is accurate and signal High sensitivity, suitable for promotion and popularization.

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Abstract

The invention discloses a three-electrode battery. The three-electrode battery comprises a positive pole piece, a negative pole piece, two layers of diaphragms and a reference electrode, wherein one side of the positive pole piece is provided with a positive pole lug, one side of the negative pole piece is provided with a negative pole lug, and the positive pole lug and the negative pole lug are arranged on the same side; the diaphragms are arranged between the positive pole piece and the negative pole piece; the reference electrode comprises a body and a connecting part; the connecting part is arranged between the two layers of diaphragms and is positioned between the tops of the pole pieces and the tops of the diaphragms; and a metal lithium sheet is mounted on the surface of the connecting part. The three-electrode battery is accurate and stable in electrical performance signal output, the complexity of the traditional lithium plating, welding and other processes is avoided throughmechanical structure limiting, and the battery is simple to operate and is suitable for mass production.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular, the invention relates to a three-electrode battery. Background technique [0002] As the secondary battery with the highest energy density in the energy storage range that can be applied on a large scale, lithium-ion batteries have covered most of the communication and digital product markets, and have had an important impact on their technological progress. In recent years, with the improvement of performance and production level, lithium-ion batteries have begun to be used in green and environmentally friendly new energy electric vehicles and other electric vehicles, becoming a very important product in the new energy industry. In response to the needs of the development of lithium-ion batteries, research on the performance of lithium-ion batteries has also become more in-depth. Among them, the electrochemical performance of lithium-ion batteries is monitored by making three-ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/48H01M4/13H01M10/0525
CPCH01M4/13H01M10/0525H01M10/48Y02E60/10
Inventor 周伟杰张要军张芳芳吕豪杰
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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