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Lithium supplementing method of lithium ion battery

A technology for lithium-ion batteries and lithium supplementation, which is applied to battery electrodes, secondary batteries, and secondary battery repair/maintenance, etc. It can solve the problem of insufficient lithium supplementation materials, lithium supplementation at the negative electrode of lithium supplementation materials, and failure to achieve expected results. and other problems to achieve the effect of overcoming lithium precipitation at the negative electrode, increasing the amount of addition, and prolonging the service life

Active Publication Date: 2022-03-01
QINGTAO KUNSHAN ENERGY DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned one or more technical problems existing in the prior art, an embodiment of the present application provides a method for replenishing lithium in a lithium-ion battery, so as to solve the problem that the amount of lithium replenishing materials existing in the lithium replenishing method in the prior art is too much It is easy to cause problems such as lithium precipitation at the negative electrode, and the expected effect cannot be achieved if the amount of lithium supplementary material is too small.

Method used

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  • Lithium supplementing method of lithium ion battery
  • Lithium supplementing method of lithium ion battery
  • Lithium supplementing method of lithium ion battery

Examples

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preparation example Construction

[0085] figure 2 It is a flow chart of the preparation method of the positive electrode of the lithium ion battery provided by the embodiment of the present application, referring to figure 2 As shown, the embodiment of the present application also provides a method for preparing the positive electrode of the above-mentioned lithium ion battery, the preparation method comprising:

[0086] S101: Dissolving the first positive electrode active material, the first lithium-supplementing material, the binding material, and the conductive material in the first predetermined proportion in a predetermined solvent to obtain a first positive electrode slurry, and coating the first positive electrode slurry onto the current collector and dried to obtain the first active material layer;

[0087] S102: Dissolving the second positive electrode active material, the second lithium-supplementing material, the binding material, and the conductive material in a preset solvent in a second predet...

Embodiment 1

[0114] An embodiment of the present application provides a lithium-ion battery, which includes a negative electrode, a diaphragm stack, and a positive electrode of a lithium-ion battery, wherein the positive electrode of a lithium-ion battery includes a current collector and an active material layer disposed on the surface of the current collector, and the active material layer includes at least The first active material layer in contact with the surface of the current collector and the second active material layer arranged on the surface of the first active material layer, the first active material layer contains a first lithium supplementary material, and the second active material layer contains a second supplementary lithium material. For the lithium material, the decomposition voltage of the first lithium supplementary material in the first active material layer is lower than the decomposition voltage of the second lithium supplementary material in the second active materia...

Embodiment 2

[0127] The difference from Example 1 is that the preparation process of the lithium-ion battery is as follows:

[0128] The NCM811, , PVDF and SUPER-P are proportioned according to the mass ratio of 92:3:2:3, dissolved in NMP to obtain the first positive electrode slurry, and the first positive electrode slurry is coated on the aluminum foil and dried to obtain a first active material layer;

[0129] Will , , PVDF and SUPER-P are proportioned according to the mass ratio of 89:7:2:2, dissolved in NMP to obtain the second positive electrode slurry, and the second positive electrode slurry is coated on the first active material layer, Drying to obtain the positive electrode sheet of the lithium-ion battery;

[0130] Dissolving graphite, (CMC+SBR) and super-P in NMP at a ratio of 95:2:3 to obtain negative electrode slurry, coating the negative electrode slurry on copper foil, and drying to obtain negative electrode sheet;

[0131] The positive electrode sheet, the negative e...

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Abstract

The invention provides a lithium supplement method of a lithium ion battery, which comprises the following steps: charging the lithium ion battery by using a first voltage to decompose a first lithium supplement material, performing first lithium supplement on the lithium ion battery, and charging the lithium ion battery by using a second voltage when the capacity of the lithium ion battery is reduced to a preset threshold value, the lithium supplement materials in the two active material layers are decomposed at different time, so that the purpose of secondary lithium supplement is achieved, the addition amount of the lithium supplement materials is improved, and the defects that in the prior art, the lithium supplement materials are too high, so that lithium precipitation of a negative electrode is easily caused, and the lithium supplement efficiency is high are overcome. And the expected effect cannot be achieved due to too few lithium supplementing materials, and the service life of the lithium ion battery is greatly prolonged.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to a method for replenishing lithium in lithium-ion batteries. Background technique [0002] Due to the inevitable irreversible loss of lithium in the actual use of lithium batteries, it is necessary to supplement lithium to the positive or negative electrodes. Commonly used methods of lithium supplementation include lithium foil supplementation, lithium powder supplementation, electrochemical lithium supplementation, and positive and negative lithium supplementation. Among them, positive electrode lithium supplementation can directly add lithium supplementation materials in the homogenization process of positive electrode slurry, without additional process improvement and low cost, so it is more suitable for the current lithium-ion battery manufacturing process, and is known as the most promising supplementary material. lithium technology. [0003] However, the curren...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525H01M10/42
CPCH01M10/4235H01M10/0525H01M4/5825H01M4/48Y02E60/10
Inventor 冯玉川何泓材许蕾李峥
Owner QINGTAO KUNSHAN ENERGY DEV CO LTD
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