Lithium electrode and lithium secondary battery comprising same

A lithium electrode and current collector technology, which is applied in the field of lithium electrodes, can solve the problems of adverse effects on battery performance and different lithium forms, and achieve the effect of making up for easy cracking, thin and uniform thickness, and preventing deterioration

Active Publication Date: 2020-05-26
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since lithium thin films are formed by deposition, as described above, there is a problem that the morphology of lithium deposited on both sides of the current collector cannot be the same and battery performance will be adversely affected.

Method used

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  • Lithium electrode and lithium secondary battery comprising same
  • Lithium electrode and lithium secondary battery comprising same
  • Lithium electrode and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] Embodiment 1: the manufacture of lithium electrode

[0140] A release PET film (SKC Haas, RX12G50 μm) having release layers on both surfaces was prepared as a base material.

[0141] A PVDF-HFP coating solution was prepared as a coating solution for forming a protective layer for protecting lithium metal on one side of the substrate. PVDF-HFP coating solutions were prepared by dissolving PVDF-HFP (Arkema, LBG grade) in NMP solvent as a 5% solution.

[0142] The PVDF-HFP coating solution was coated on one side of the release PET film at a thickness of 0.2 μm using a micro-gravure coater to form a PVDF-HFP protective layer.

[0143] Lithium metal was deposited on the protective layer by vapor deposition at a temperature of 600° C. to form a lithium metal layer having a thickness of 20 μm, and the above-mentioned release PET film, PVDF-HFP protective layer, and lithium metal layer were sequentially stacked. The structure was wound at a speed of 1 m / min. Two stacked stru...

Embodiment 2

[0147] Embodiment 2: the manufacture of lithium electrode

[0148] A PVDF protective layer was formed in the same manner as in Example 1 except that PVDF was used instead of PVDF-HFP as a polymer for forming the protective layer.

Embodiment 3

[0149] Embodiment 3: the manufacture of lithium electrode

[0150] A lithium electrode was fabricated in the same manner as in Example 1 except for using a current collector having SiO coatings on both sides thereof.

[0151] At this time, in order to form the SiO coating, a mixture of SiO and graphite at a weight ratio of 1:1 was dissolved in an ethanol solvent to form a coating solution having a concentration of 1M.

[0152] The coating solution was coated on both sides of the current collector with a thickness of 80 μm using a slot die coater to form a SiO coating layer.

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Abstract

The present invention relates to a lithium electrode and a lithium secondary battery comprising the same. More particularly, the present invention is capable of manufacturing a lithium electrode having a thin and uniform thickness by: firstly forming a protective layer capable of protecting a lithium metal on a substrate while manufacturing a lithium electrode; depositing the lithium metal on theprotective layer; and then transferring the deposited lithium metal layer to at least one surface of a current collector, and thereby the energy density of a lithium secondary battery using a lithiumelectrode manufactured as above may be improved.

Description

technical field [0001] This application claims the benefit of Korean Patent Application No. 10-2017-0133772 filed on October 16, 2017 and Korean Patent Application No. 10-2018-0122935 filed on October 16, 2018, the entire contents of these Korean Patent Applications Incorporated herein by reference. [0002] The present invention relates to a lithium electrode including a lithium metal layer capable of improving energy density of a battery by having a uniform thin film shape; and a lithium secondary battery including the lithium electrode. Background technique [0003] Until recently, developing batteries with high energy density using lithium as the anode has attracted considerable attention. For example, compared to other electrochemical systems with lithium-intercalated carbon anodes and nickel or cadmium electrodes due to the presence of non-electroactive materials that increase the weight and volume of the anode, thereby reducing the energy density of the battery, due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/66H01M10/052
CPCH01M4/134H01M10/052H01M4/366H01M4/382H01M4/667H01M4/661H01M4/62H01M4/1395H01M4/0421H01M4/0402Y02E60/10H01M4/628H01M4/663H01M2004/021
Inventor 尹锡逸孙炳国崔净勋张民哲
Owner LG ENERGY SOLUTION LTD
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