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Reference electrode processing method and three-electrode lithium ion battery

A technology of reference electrode and processing method, applied in the field of lithium-ion power battery, can solve the problems of short service life and unstable potential, and achieve the effect of improving stability and prolonging service time.

Active Publication Date: 2022-07-29
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a treatment method of a reference electrode and a three-electrode lithium-ion battery to solve the problems of unstable potential and short service life of the reference electrode of the three-electrode lithium-ion battery in the prior art after long-term operation

Method used

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  • Reference electrode processing method and three-electrode lithium ion battery
  • Reference electrode processing method and three-electrode lithium ion battery
  • Reference electrode processing method and three-electrode lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Three soft-packed three-electrode cells with a capacity of 1.9Ah and a model of 4060D8 are selected. The reference electrode is realized by placing a copper wire between the positive and negative pole pieces, and plating the positive and negative electrodes in-situ with lithium. , the positive electrode of the selected battery cell is ternary NCM523 material, the negative electrode is graphite, and the upper and lower limit voltage of conventional charging and discharging is 2.5~4.1V.

[0044] (1) Charge at 0.5C to 4.1V, constant voltage to 0.05C, let stand for 10min, then discharge at 1C to 2.5V to complete one week of charge and discharge, and monitor the positive and negative potentials at the same time, the positive initial potential V1 is 3.78V, the negative electrode The initial potential V2 was 0.22V.

[0045] (2) Use the positive electrode of the battery as the positive electrode for dissolving lithium, and the reference electrode as the negative electrode for d...

Embodiment 2 to 4

[0050] The difference between Examples 2 to 4 and Example 1 is that the first charging lithium plating current and time, the second charging lithium plating current and time, the first discharging lithium dissolving current, and the second discharging lithium dissolving current are different, see Table 1 for details. . After 1500 cycles in Examples 2 and 3, the positive and negative potential curves measured by the reference electrode are similar to those in Example 1, and the reference electrode is stable and has a good lifespan. After 1000 cycles in Example 4, the positive and negative potential curves measured by the reference electrode have slight fluctuations compared with Example 1, and the reference electrode is relatively stable and has a good lifespan.

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Abstract

The invention provides a processing method of a reference electrode and a three-electrode lithium ion battery. The treatment method comprises the following steps: acquiring a three-electrode cell, wherein the three-electrode cell comprises an initial reference electrode, a positive electrode and a negative electrode; dissolving lithium in the initial reference electrode to obtain an intermediate reference electrode without lithium residue on the surface; and plating lithium on the intermediate reference electrode to obtain a target reference electrode with a lithium metal layer on the surface. According to the technical scheme, the lithium dissolving treatment is added in the use process of the reference electrode of the three-electrode lithium ion battery, so that residual lithium and reaction products on the surface of the metal conductor can be dynamically removed, the metal conductor can recover a good surface state, the smoothness, flatness and uniformity of a lithium plating layer can be kept in the subsequent lithium plating step, and the service life of the lithium plating layer is prolonged. Therefore, the stability of the reference electrode after lithium plating is effectively improved, and the service time of the reference electrode and the three-electrode lithium ion battery is prolonged.

Description

technical field [0001] The invention relates to the field of lithium ion power batteries, in particular, to a method for treating a reference electrode and a three-electrode lithium ion battery. Background technique [0002] With the increasingly prominent problems such as energy crisis and environmental pollution, the development of new energy technology has attracted the attention of all sectors of society. Lithium-ion battery is a very important energy conversion device in the field of new energy. It is widely used in transportation vehicles, portable electronic equipment, etc. People's daily life and the healthy development of society are inseparable from it, but also its performance in all aspects. put forward higher requirements. Usually, the electrical properties of the test are the results of a combination of the positive electrode, negative electrode, electrolyte and other components. It is difficult to measure the real state of the positive electrode and negative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04H01M10/0525H01M10/058
CPCH01M4/139H01M4/045H01M10/058H01M10/0525Y02E60/10
Inventor 曹志颖周灿凯黄小清
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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