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Method for monitoring potentials of anode and cathode of lithium-ion battery

A lithium-ion battery, positive and negative electrode technology, which is applied in the field of effectively monitoring the positive and negative voltages of lithium-ion batteries, can solve the problems of potential drift, the third electrode is easily affected by external factors, and the production process is cumbersome, and achieves simple production. Effect

Active Publication Date: 2012-07-18
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only has a cumbersome production process, but also requires a high production environment for adding lithium sheets in the middle, and the production success rate is low, and because the third electrode is easily affected by external factors, the measured results have potential drift.
Therefore, it is difficult to accurately monitor the positive and negative electrode potentials continuously for a long time using the three-electrode method

Method used

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  • Method for monitoring potentials of anode and cathode of lithium-ion battery
  • Method for monitoring potentials of anode and cathode of lithium-ion battery
  • Method for monitoring potentials of anode and cathode of lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of working cell 1:

[0044] Preparation of positive electrode sheet:

[0045] The positive electrode active material lithium cobalt oxide (LiCoO 2 ), the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) were added to the solvent N-methylpyrrolidone (NMP) in a mass ratio of 96:1.5:2.5 to disperse evenly to prepare the positive electrode slurry. Then, the positive electrode slurry was coated on the Al foil (12 μm in thickness), and operations such as rolling, slicing, drying and welding of the positive electrode tab 11 were performed to obtain the positive electrode sheet.

[0046] Preparation of negative electrode sheet:

[0047] Negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber emulsion and thickener sodium carboxymethyl cellulose are added to solvent water according to the mass ratio of 94:1.5:2.5:2 and mixed evenly, and the negative electrode is prepared after sti...

Embodiment 2

[0055] The preparation of the working cell 1 is the same as that in Example 1.

[0056] The preparation of reference battery cell 2, reference battery cell 2 is a negative electrode sheet, and its preparation method is as follows:

[0057] Add soft carbon as the negative electrode active material, acetylene black as the conductive agent, styrene-butadiene rubber emulsion as the binder, and sodium carboxymethylcellulose as the thickener according to the mass ratio of 94:1.5:2.5:2, and mix them evenly in solvent water. Negative slurry. Then the negative electrode slurry is coated on the Cu foil (thickness is 16 μm), and then roll pressing, slicing, drying and welding the first tab 21 and the second tab 22 and other operations to prepare the negative electrode sheet, that is, the reference Cell 2.

[0058] Preparation of four-electrode lithium-ion battery:

[0059] Such as figure 1 As shown, the working cell 1 and the reference cell 2 are packaged in the same packaging bag 3,...

Embodiment 3

[0062] The preparation of the working cell 1 is the same as that in Example 1.

[0063] Preparation of reference cell 2:

[0064] Preparation of positive electrode sheet:

[0065] The positive electrode active material lithium nickel cobalt manganese oxide (LiNi 0.4 co 0.4 al 0.2 o 2 ), the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) were added to the solvent N-methylpyrrolidone (NMP) in a mass ratio of 96:1.5:2.5 to disperse evenly to prepare the positive electrode slurry. Then the positive electrode slurry was coated on the Al foil (12 μm in thickness), and operations such as rolling, slicing, drying, and welding of the first tab 21 were performed to obtain the positive electrode sheet.

[0066] Preparation of negative electrode sheet:

[0067] The negative electrode active material hard carbon, the conductive agent acetylene black, the binder styrene-butadiene rubber emulsion and the thickener sodium carboxymethyl cellulose are adde...

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for monitoring potentials of an anode and a cathode of a lithium-ion battery. The method includes packing a working cell and a reference cell in the same packaging bag, immitting electrolyte to obtain a four-electrode lithium-ion battery after formation, aging and capacity sorting, wherein an electronic insulating film is arranged between the working cell and the reference cell, a positive lug and a negative lug are arranged at the front end of the working cell, and a first lug and a second lug are arranged at the front end of the reference cell; connecting the positive lug and the negative lug with either the first lug or the second lug respectively, and monitoring the potential of the anode and the cathode of the lithium-ion battery. Compared with the prior art, the method for monitoring the potential of the anode and the cathode of the lithium-ion battery has the advantages that both anode and cathode of the reference cell have stable potentials with small drifting and little variation over time in a half-charged state; and potential change of the anode and the cathode of the battery in a test and in work can be effectively monitored.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for effectively monitoring the positive and negative electrode voltages of lithium ion batteries. Background technique [0002] Since Japan's Sony (Sony) took the lead in commercializing lithium-ion batteries in 1991, they have been widely used in various fields due to their advantages of high energy density, high voltage, low self-discharge rate and light weight. In recent years, with the advancement of science and technology, people's requirements for the performance of lithium-ion batteries are increasing day by day. [0003] A lithium-ion battery generally includes a positive electrode, a negative electrode, a separator spaced between the positive electrode and the negative electrode, and an electrolyte. Among them, the positive and negative electrodes have a great influence on the performance of the lithium-ion battery. In order to find ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/48
CPCY02E60/12Y02E60/10
Inventor 向登姜斌刘凯
Owner DONGGUAN AMPEREX TECH
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