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Lithium secondary battery having lithium metal formed on anode and manufacturing method therefor

A lithium secondary battery and positive electrode technology, which is applied in secondary battery, electrolyte storage battery manufacturing, secondary battery repair/maintenance, etc., can solve problems such as difficult preparation and use, and achieve the effect of enhancing cycle life performance and inhibiting formation

Active Publication Date: 2018-11-09
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when lithium metal is used as a battery negative electrode, lithium foil is usually attached to a flat current collector to make the battery, and the disadvantage of lithium is that it is difficult to prepare and use in a general environment because lithium has a high reactivity as an alkali metal , thus reacting explosively with water and also with atmospheric oxygen

Method used

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  • Lithium secondary battery having lithium metal formed on anode and manufacturing method therefor
  • Lithium secondary battery having lithium metal formed on anode and manufacturing method therefor
  • Lithium secondary battery having lithium metal formed on anode and manufacturing method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0067] The LCO-based cathode active material, Super-P (conductive carbon black) and PVdF were mixed in a weight ratio of 95:2.5:2.5, and then coated on an aluminum current collector to form a cathode (load 450mg / 25cm 2 ). A lamination method was used to laminate lithium metal with a thickness of 20 μm thereon.

[0068] On one surface of the copper current collector, a negative electrode formed with a 0.2 μm thick LiPON protective layer was prepared.

[0069] A porous polyethylene separator is disposed between the prepared positive electrode and the negative electrode to prepare an electrode assembly, and after the electrode assembly is placed in the case, an electrolyte is injected therein to manufacture a lithium secondary battery. Here, the electrolyte is prepared as follows: 1M LiPF 6 And 2% by weight of vinylene carbonate (VC) dissolved in fluoroethylene carbonate (FEC): ethylene carbonate (EC): diethyl carbonate (DEC) in a volume ratio of 1:1:2:1 ): In an organic solvent form...

Embodiment 2

[0071] A lithium secondary battery was manufactured in the same manner as in Example 1, except that a LiPON protective layer was not formed in the negative electrode.

Embodiment 3

[0073] A lithium secondary battery was manufactured in the same manner as in Example 1, except that a 0.3 μm-thick PVdF-HFP (HFP content: 5 wt%) protective layer was formed on one surface of the copper current collector instead of the negative electrode LiPON protection layer in the.

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Abstract

The invention relates to a lithium secondary battery and, more particularly, to a lithium secondary battery having lithium, serving as a cathode active material, formed on an anode side thereof and amanufacturing method therefor. In the lithium secondary battery according to the invention, a lithium thin film is coated under an air tight condition during a process of forming the lithium thin filmon a cathode current collector, which can restrain the formation of a native oxide layer, attributed to oxygen and moisture in air, on the lithium thin film, with the consequent improvement of cyclelife characteristics therein.

Description

Technical field [0001] This application claims the priority and rights of Korean patent application No. 10-2016-0089154 filed with the Korean Intellectual Property Office on July 14, 2016, the entire content of which is incorporated herein by reference. [0002] The present invention relates to a lithium secondary battery, in particular to a lithium secondary battery with lithium metal formed on the positive electrode side, and a method of manufacturing the same. Background technique [0003] Various devices that require batteries from mobile phones, wireless electronic devices to electric vehicles have recently been developed, and with the development of these devices, the demand for secondary batteries has also increased. In particular, with the trend of lighter electronic products, secondary batteries also tend to be lighter and smaller. [0004] According to this trend, lithium secondary batteries using lithium metal as an active material are attracting attention. Lithium metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/42H01M10/058H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/052H01M10/058H01M10/42H01M4/0445H01M4/134H01M4/1395H01M4/382Y02P70/50Y02E60/10H01M10/4242Y02T10/70H01M4/628H01M10/0585H01M2004/028
Inventor 孙炳国张民哲崔净勋朴恩囧朴昶勋
Owner LG ENERGY SOLUTION LTD
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