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Protected active metal electrode and lithium-metal electrode and device with the electrodes

A technology of lithium metal electrodes and active metals, which is applied in the field of lithium metal electrodes and components with such electrodes, and active metal electrodes, can solve the problems that the layers of the electrodes cannot maintain a stable compatible structure, volume expansion, and affect the service life, etc., to achieve Avoid surface morphology change, best resistance effect

Active Publication Date: 2014-07-09
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, if the multilayer structure contains ion-conducting ceramics, ion-conducting salts, organic compounds, polymers, etc., it is easy to have the problem of poor electron conduction ability.
If the multilayer structure contains metals that can alloy with ions, it is easy to inevitably produce volume expansion during the alloying process with ions, resulting in the inability of each layer of the electrode to maintain a stable and compatible structure, which affects the service life, and even the protective layer material fragmented situation

Method used

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  • Protected active metal electrode and lithium-metal electrode and device with the electrodes
  • Protected active metal electrode and lithium-metal electrode and device with the electrodes
  • Protected active metal electrode and lithium-metal electrode and device with the electrodes

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0089] The lithium metal electrode of Production Example 4, Comparative Example 1 and Comparative Example 2 was used as the negative electrode material, and lithium cobalt oxide was used as the positive electrode and the binder was mixed and coated on the aluminum foil as the positive electrode, and the electrolyte solution containing lithium ions was used. Constituent element one, control element one and control element two.

[0090] The above three components were tested, and the following table 1 was obtained.

[0091] Table I

[0092]

[0093] Zp: positive electrode impedance; Ze: electrolyte impedance; Zn: negative electrode impedance.

[0094] As can be seen from Table 1, using the traditional non-conductive lithium nitride to protect the lithium electrode will cause a significant increase in impedance. However, the device 1 of the present invention has lower impedance performance than the unprotected lithium electrode in terms of impedance.

experiment example 2

[0096] The initial capacitance of element 1 and control element 1 of experimental example 1 was measured and recorded in Table 2 below together with their total impedance.

[0097] In addition, element 1 and control element 1 were assembled in the same manner as in Experimental Example 1, but the following degradation tests were performed on the lithium negative electrode before composition.

[0098] Deterioration test: Expose various lithium electrodes to an atmospheric environment at 25°C and 70%RH for 3 minutes.

[0099] Then, the initial capacitance and total impedance of the element 1 and the control element 1 having the lithium negative electrode of the degradation test were measured, and the results are also recorded in Table 2 below.

[0100] Table II

[0101]

[0102] It can be seen from Table 2 that the total impedance of the unprotected lithium electrode increased significantly after the degradation test, and the active capacitance decreased significantly. Usin...

experiment example 3

[0104] In the same manner as in Experimental Example 1, component 1, control component 1 and control component 2 were composed, and then 20 charge-discharge cycles were performed. The relationship between the number of cycles and the capacitance is shown in Figure 5 , and the capacitance results after the initial and 20 cycles are recorded in Table 3 below.

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Abstract

A protected active metal electrode and lithium-metal electrode and a device with the electrodes are provided. The protected active metal electrode includes an active metal substrate and a protection layer on a surface of the active metal substrate. The protection layer at least includes a metal thin film covering the surface of the active metal substrate and an electrically-conductive thin film covering a surface of the metal thin film. A material of the metal thin film is Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, or W. A material of the electrically-conductive thin film is selected from nitride of a metal in the metal thin film, carbide of a metal in the metal thin film, a diamond-like carbon (DLC), and a combination thereof.

Description

technical field [0001] The present invention relates to the structure of an active metal electrode, and in particular to a protected active metal electrode, a lithium metal electrode and components with the electrode. Background technique [0002] Improving storage capacity is one of the current research and development priorities of secondary batteries. In secondary batteries, the positive and negative electrodes of lithium-ion batteries can have the highest energy density by using materials that can intercalate / extract lithium ions, but due to the limited capacity of the positive and negative materials, lithium-ion batteries can The highest energy density achieved is limited by the material bottleneck and cannot be improved upwards. Therefore, the development of electrode materials with high capacitance is urgently needed. [0003] Among many materials, the use of active metals such as lithium, sodium, magnesium, calcium, aluminum, etc. as the active material of the batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134
CPCB82Y30/00H01M4/134H01M4/366H01M10/0525H01M4/13H01M4/38H01M4/382H01M4/483H01M4/581H01M4/624H01M4/625H01M2004/021Y02E60/10Y10S977/742Y10S977/948
Inventor 吴金宝蔡丽端张嘉珍吕明生黄震宇李俊龙
Owner IND TECH RES INST
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