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Method and device for measuring lithium pre-intercalation amount of lithium ion battery negative electrode

A technology of lithium-ion batteries and pre-embedded lithium, which is applied in the field of lithium-ion batteries, can solve problems affecting battery performance, achieve simple operation, and ensure the effect of battery production and use

Inactive Publication Date: 2020-12-04
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a method and device for measuring the amount of pre-intercalated lithium in the negative electrode of a lithium-ion battery, which is used to solve the defects in the prior art that affect the performance of the battery through weighing measurement, and to achieve convenient and accurate determination of the amount of pre-intercalated lithium in the negative electrode

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  • Method and device for measuring lithium pre-intercalation amount of lithium ion battery negative electrode

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Embodiment 1

[0038] The embodiment of the present invention provides a device for measuring the amount of pre-embedded lithium in the negative electrode of a lithium-ion battery. A lithium sheet with a thickness ≥ 50 μm is used as a counter electrode 1, a silicon oxygen carbon negative electrode is a working electrode 3, and a lithium-rich manganese-based solid solution positive electrode is used as a reference electrode. 4. Diaphragm 2 adopts polyolefin diaphragm, and is assembled according to the sequence of counter electrode 1, diaphragm 2, working electrode 3 and reference electrode 4 as follows: figure 1 In the structure shown, the counter electrode 1 and the diaphragm 2 are attached to each other, the working electrode 3, the reference electrode 4 and the diaphragm 2 are also attached, and the reference electrode 4 is in the shape of a ring, which is in the same position as the working electrode 3. On a horizontal plane but without contact, the outer radius of the ring of the referenc...

Embodiment 2

[0040] The embodiment of the present invention provides a method for measuring the amount of pre-intercalated lithium in the negative electrode of a lithium-ion battery, and the specific steps are as follows:

[0041] 1) The silicon oxygen carbon negative electrode is used as the working electrode, the lithium sheet with a thickness ≥ 50 μm is used as the counter electrode, the lithium-rich manganese-based solid solution positive electrode is used as the reference electrode, and the diaphragm is made of polyolefin diaphragm, such as figure 1 The three-electrode structure shown;

[0042] 2) Use an electrochemical workstation or a charge-discharge tester to perform lithium intercalation on the silicon oxygen carbon negative electrode working electrode with a constant current titration method for every 1-10% of the electricity, and the relaxation time is ≥ 10 hours, and record the silicon oxygen carbon negative electrode working electrode and The potential between the lithium-ric...

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Abstract

The embodiment of the invention provides a method and a device for measuring the lithium pre-intercalation amount of a lithium ion battery negative electrode. The method comprises the following steps:simulating to obtain a potential curve of the negative electrode relative to a positive electrode at different lithium intercalation amounts; and substituting indication potential into the potentialcurve by taking the stable voltage between the positive electrode and the negative electrode in the actual battery as the indication potential so as to calculate the lithium pre-embedding amount of the negative electrode in the actual battery. Compared with a traditional thickness measuring or weighing method, the method for measuring the lithium pre-embedding amount of the negative electrode of the lithium ion battery has the advantages of being easy to operate, reliable and the like. According to the method disclosed by the invention, the normal battery manufacturing process is not influenced while the negative electrode pre-embedded lithium quantity is accurately obtained, so that a reference is provided for quality control of the pre-embedded lithium battery, screening, grading, matching and the like of the later pre-embedded lithium battery, and the controllability of battery manufacturing and use is ensured.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method and a device for measuring the amount of pre-intercalated lithium in negative electrodes of lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in many fields due to their many outstanding advantages. However, with the continuous expansion of application fields and the continuous improvement of application requirements, the demand for high-performance lithium-ion batteries is more urgent. The development of high-performance lithium-ion batteries is heavily dependent on the progress of the material system. At this stage, the positive electrode materials are gradually shifting to high-nickel ternary or next-generation high-voltage materials, and the negative electrode materials are gradually mixed with silicon-based materials from complete graphite materials. , The change of these material systems often brings about the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26H01M10/0525H01M10/058
CPCG01N27/26H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 李翔钱义赵元宇祁传磊
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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