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Method for analyzing expansion extent of lithium metal cathode

A technology of lithium metal negative electrode and analysis method, applied in the direction of mechanical thickness measurement, secondary battery testing, secondary battery charging/discharging, etc., to achieve the effect of great practical significance in production

Active Publication Date: 2018-11-27
TIANJIN LISHEN BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Method for analyzing expansion extent of lithium metal cathode
  • Method for analyzing expansion extent of lithium metal cathode
  • Method for analyzing expansion extent of lithium metal cathode

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Embodiment 1

[0054] For the test method of a kind of lithium metal negative electrode expansion range provided by the present invention, the steps are as follows:

[0055] Step 1: Select a pouch 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, the preparation of soft-packed thin-film batteries for thickness expansion testing: prepare battery components such as positive electrodes, large-area lithium metal negative electrodes, tabs, diaphragms, electro-hydraulics, and soft-packed battery cases according to the traditional laminated battery technology, and assemble large-scale Area lithium metal negative electrode thickness expansion special soft pack thin 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, the t...

Embodiment 2

[0064] For the test method of a kind of lithium metal negative electrode expansion range provided by the present invention, the steps are as follows:

[0065] Step 1: Select a pouch 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, the preparation of soft-packed thin-film batteries for thickness expansion testing: prepare battery components such as positive electrodes, large-area lithium metal negative electrodes, tabs, diaphragms, electro-hydraulics, and soft-packed battery cases according to the traditional laminated battery technology, and assemble large-scale Area lithium metal negative electrode thickness expansion special soft pack thin 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, the t...

Embodiment 3

[0074] For the test method of a kind of lithium metal negative electrode expansion range provided by the present invention, by embodiment 1 and 2, can analyze and obtain following conclusion:

[0075] In the first cycle, when charging, lithium is released 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 non-dense deposition of lithium metal. During the first cycle, when discharging, lithium is extracted from the negative electrode, and lithium is intercalated 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 charging is active, and can basically return to the positive electrode through lithium intercalation.

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

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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 lithium metal negative electrodes. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, many cycle times, and long storage time. They are not only widely used in portable electronic devices such as mobile phones, digital cameras, and laptop computers, 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 getting 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 widespread application of electric vehicles. Compared with the currently mature anode materia...

Claims

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Application Information

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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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