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Polymer protecting layer, lithium metal negative electrode, lithium secondary battery

Inactive Publication Date: 2017-10-19
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present disclosure is a detailed description of technology solutions and their advantages. The examples provided in the disclosure are only meant to explain the technology, and not to limit it. In simple terms, the patent describes how to make objects, devices, and systems using certain techniques and methods. The "technical effects" of this patent include explaining the techniques for making objects more clearly, and providing examples for reference.

Problems solved by technology

At present, the commercial lithium-ion battery mainly uses graphite as the negative active material, but its specific discharge capacity has been close to a theoretical value of graphite (372 mAh / g), therefore it is difficult to further increase the specific discharge capacity of the lithium-ion battery by processing a modification technology on the graphite.
However, there are two main obstacles in the further development of the lithium secondary battery: (1) the lithium dendrite is easily formed during cycle processes of the lithium secondary battery, the lithium secondary battery is easily short-circuited; (2) the lithium dendrite has a large surface area, a high reactivity and easily reacts with electrolyte, therefore the SEI membrane formed on the surface of the lithium metal is ceaselessly destroyed and formed, the electrolyte and the lithium ions are ceaselessly consumed, thereby decreasing cycle efficiency of the lithium secondary battery and shortening the cycle life of the lithium secondary battery.
Therefore, how to effectively improve the surface properties of the lithium metal and inhibit the growth of the lithium dendrite is the key issue in the further development of the lithium secondary battery.
However, there is a problem that the in-situ formed protective membrane has a weak mechanical strength and cannot completely cover the SEI membrane on the surface of the lithium metal, therefore it cannot completely prevent the SEI membrane from being severely and ceaselessly destroyed and formed during the lithium deposition / dissolution processes which is caused by change of the lithium metal topography.
The growth of the lithium dendrite and the problems caused by the lithium dendrite are not solved substantially.

Method used

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  • Polymer protecting layer, lithium metal negative electrode, lithium secondary battery
  • Polymer protecting layer, lithium metal negative electrode, lithium secondary battery
  • Polymer protecting layer, lithium metal negative electrode, lithium secondary battery

Examples

Experimental program
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Effect test

example 1

[0049]Preparation of the positive electrode P1#: lithium cobalt oxide (LiCoO2, positive active material), conductive carbon black (Super-P, conductive agent) and polyvinylidene fluoride (PVDF, binder) were uniformly dispersed in 1-methyl-2-pyrrolidinone (NMP, solvent) to form a positive electrode slurry. A solid content of the positive electrode slurry was 77 wt %, solid components in the positive electrode slurry were 98.26 wt % of lithium cobalt oxide, 0.9 wt % of PVDF and 0.84 wt % of conductive carbon black. Then the positive electrode slurry was uniformly coated on two surfaces of an aluminum foil (positive current collector) with a thickness of 12 μm, a coating weight on each surface of the aluminum foil was 0.0215 g / cm2; then a drying process was performed at 85° C., which was followed by cutting into a disk with a diameter (Φ) of 14 mm, and then the disk was dried under vacuum at 85° C. for 4 h, the obtained positive electrode was marked as P1#.

[0050]Preparation of the polym...

example 2

[0054]Preparation of the lithium metal negative electrode N2#: 0.8 g of Al2O3 was added into 8 g of 1-methyl-2-pyrrolidinone (NMP, solvent) by means of ultrasonic dispersion for 30 min, then 1 g of polymer ionic liquid L1# (formula II) and 0.2 g of polyvinylidene fluoride (PVDF, the number-average molecular weight was about 1,000,000) were added and stirred constantly for 5 h, the obtained mixture was uniformly coated on two surfaces of the lithium metal foil, a lithium metal negative electrode was obtained, the obtained lithium metal negative electrode was marked as N2#.

[0055]Preparation of the lithium secondary battery C2#: the preparation of the lithium secondary battery was the same as the preparation of the lithium secondary battery C1#, except that the used lithium metal negative electrode was N2#, and the obtained lithium secondary battery was marked as C2#.

example 3

[0056]Preparation of the lithium metal negative electrode N3#: 0.8 g of Al2O3 was added into 8 g of 1-methyl-2-pyrrolidinone (NMP, solvent) by means of ultrasonic dispersion for 30 min, then 1 g of polymer ionic liquid L1# (formula II) and 0.2 g of polyethylene oxide (PEO, the number-average molecular weight was about 600,000) were added and stirred constantly for 5 h, the obtained mixture was uniformly coated on two surfaces of the lithium metal foil, a lithium metal negative electrode was obtained, the obtained lithium metal negative electrode was marked as N3#.

[0057]Preparation of the lithium secondary battery C3#: the preparation of the lithium secondary battery was the same as the preparation of the lithium secondary battery C1#, except that the used lithium metal negative electrode was N3#, and the obtained lithium secondary battery was marked as C3#.

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Abstract

The present disclosure provides a polymer protecting layer, a lithium metal negative electrode, a lithium secondary battery. In the lithium secondary battery of the present disclosure, a polymer protecting layer comprising a polymer ionic liquid is coated on a surface of a lithium metal sheet, which can effectively slow down or even inhibit the growth of the lithium dendrite, improve the first charge-discharge cycle coulombic efficiency of the lithium secondary battery, and significantly improve the cycle performance and the safety performance of the lithium secondary battery.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority to Chinese patent application No. CN201610242231.2, filed on Apr. 19, 2016, which is incorporated herein by reference in its entirety.FIELD OF THE PRESENT DISCLOSURE[0002]The present disclosure relates to a field of lithium secondary battery, and particularly relates to a polymer protecting layer, a lithium metal negative electrode, a lithium secondary battery.BACKGROUND OF THE PRESENT DISCLOSURE[0003]At present, the lithium-ion battery has been widely used in electronic products such as mobile phones, laptops and cameras. At present, the commercial lithium-ion battery mainly uses graphite as the negative active material, but its specific discharge capacity has been close to a theoretical value of graphite (372 mAh / g), therefore it is difficult to further increase the specific discharge capacity of the lithium-ion battery by processing a modification technology on the graphite. The theoretical value...

Claims

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Application Information

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IPC IPC(8): H01M4/62C08J5/22B01J43/00H01M4/134H01M10/0525H01M4/38
CPCH01M4/628H01M10/0525H01M4/134C08J2325/18C08J5/2231B01J43/00H01M4/382H01M4/137H01M4/483H01M4/606H01M4/622H01M10/052Y02E60/10
Inventor LIU, CHENGYONGWU, BINGBINGUO, YONGSHENGYI, ZIQIAN, LI
Owner NINGDE AMPEREX TECH
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