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A kind of analysis method of lithium metal negative electrode expansion amplitude

A lithium metal negative electrode and analysis method technology, applied in the direction of mechanical thickness measurement, instrument, secondary battery repair/maintenance, etc., to achieve the effect of significant production practice significance

Active Publication Date: 2020-05-19
TIANJIN LISHEN BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there is no method at present, which can accurately and reliably grasp the expansion of the large-area lithium metal negative electrode, so as to test and analyze the expansion of the large-area lithium metal negative electrode, which is conducive to grasping the overall performance of the final lithium-ion battery. performance

Method used

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  • A kind of analysis method of lithium metal negative electrode expansion amplitude
  • A kind of analysis method of lithium metal negative electrode expansion amplitude
  • A kind of analysis method of lithium metal negative electrode expansion amplitude

Examples

Experimental program
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Effect test

Embodiment 1

[0054] For the method for testing the expansion amplitude of lithium metal negative electrode provided by the present invention, the steps are as follows:

[0055] The first step: select a soft-coated thin-film lithium-ion battery with a lithium metal negative electrode, and then conduct charge and discharge tests on it;

[0056] In terms of specific implementation, it is used for the preparation of special soft-packed thin-film batteries for thickness expansion testing: according to the traditional laminated battery process, the positive electrode, large-area lithium metal negative electrode, tabs, diaphragm, electro-hydraulic, soft-pack battery shell and other battery components are prepared, and large Area lithium metal anode thickness expansion special soft-packed film battery (such as figure 1 Shown). Among them, the lithium metal negative electrode is an independently supported negative electrode with a length of 5 cm, a width of 5 cm, and a thickness of 40 μm. Among them, t...

Embodiment 2

[0064] For the method for testing the expansion amplitude of lithium metal negative electrode provided by the present invention, the steps are as follows:

[0065] The first step: select a soft-coated thin-film lithium-ion battery with a lithium metal negative electrode, and then conduct charge and discharge tests on it;

[0066] In terms of specific implementation, it is used for the preparation of special soft-packed thin-film batteries for thickness expansion testing: according to the traditional laminated battery process, the positive electrode, large-area lithium metal negative electrode, tabs, diaphragm, electro-hydraulic, soft-pack battery shell and other battery components are prepared, and large Area lithium metal anode thickness expansion special soft-packed film battery (such as figure 1 Shown). Among them, the lithium metal negative electrode is an independently supported negative electrode with a length of 5 cm, a width of 5 cm, and a thickness of 40 μm. Among them, t...

Embodiment 3

[0074] Regarding the method for testing the expansion amplitude of lithium metal negative electrode provided by the present invention, from Examples 1 and 2, the following conclusions can be analytically obtained:

[0075] During the first cycle, when charging, lithium is extracted from the positive electrode and deposited on the negative electrode. The theoretical thickness is 9 microns, and the actual thickness is 11 microns. The difference in thickness is caused by the lack of dense lithium metal deposition. In the first cycle, when discharging, lithium is extracted from the negative electrode, and lithium is inserted in the positive electrode, and the thickness of lithium metal is finally reduced to 1 micron. It shows that the lithium metal deposited in the first cycle of charging is active and can basically be returned to the positive electrode by intercalating lithium.

[0076] After five cycles, when charging, the thickness of the pole piece increases to 17 microns. When dis...

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Abstract

The invention discloses a method for analyzing the expansion extent of a lithium metal cathode. The method comprises the following steps: (1) selecting a soft-package thin film lithium ion battery with a lithium metal cathode, and carrying out charging and discharging tests on the soft-package thin film lithium ion battery; and (2) measuring the thickness of the soft-package thin film lithium ionbattery once in real time at set intervals in the testing process, and carrying out comparison on the thickness measured in real time and the pre-collected original thickness of the soft-package thinfilm lithium ion battery so as to obtain the corresponding thickness expansion extent of the soft-package thin film lithium ion battery, wherein the thickness expansion extent of the soft-package thinfilm lithium ion battery is taken as the thickness expansion extent of the corresponding lithium metal cathode. According to the method disclosed by the invention, the expansion condition of the large-area lithium metal cathode can be accurately and reliably grasped and can be tested and analyzed.

Description

Technical field [0001] The invention relates to the technical field of batteries, in particular to a method for analyzing the expansion range of a lithium metal negative electrode. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, many cycles of use, and long storage time. They are not only widely used in portable electronic devices such as mobile phones, digital cameras and laptops, but also widely used in electric vehicles, electric bicycles and electric vehicles. In terms of large and medium-sized electric equipment such as tools, the performance requirements of lithium-ion batteries are becoming higher and higher. [0003] At present, lithium-ion batteries constitute the main energy storage device of current electric vehicles, and the improvement of the energy density of lithium-ion batteries is a necessary condition for the wide application of electric vehicles. Compared with the current mature anode materials, the lithium metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/44G01R31/36G01B5/06
CPCG01B5/06H01M10/42H01M10/4285H01M10/44Y02E60/10
Inventor 高凡孟繁慧谢富国王欣全周江伍绍中
Owner TIANJIN LISHEN BATTERY
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