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Method for manufacturing lithium secondary battery

A lithium secondary battery and electromagnetic field technology, applied in secondary battery, electrolyte storage battery manufacturing, lithium storage battery, etc., can solve the problems of battery thickness increase, battery temperature rise, electrode material degradation, organic solvent volatilization, etc., to improve life characteristics , The effect of reducing the interface resistance

Pending Publication Date: 2020-07-28
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, when liquid electrolytes are used as described above, there is a high possibility of electrode material degradation and organic solvent volatilization
In addition, there are safety concerns such as burning due to the increased temperature of the battery itself and its surroundings
In particular, lithium secondary batteries have a problem that the thickness of the battery increases due to gas generation inside the battery due to the decomposition of the carbonate organic solvent and / or the side reaction between the organic solvent and the electrode during charge / discharge.
Hot melting is a method of forming a film of a composition for electrolyte in which a polymer is melted at a high temperature and then cooling it at room temperature, and there is a problem that a low-boiling organic compound cannot be used because the polymer should be melted at a high temperature solvent
[0010] However, when the curing treatment is performed using a light-emitting device or a heat-generating device located near the outside of the case, there is a problem that the composition for the gel polymer electrolyte cannot be uniformly cured

Method used

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  • Method for manufacturing lithium secondary battery
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specific Embodiment

[0078] Hereinafter, the present invention will be described in more detail based on specific examples. However, the following examples are merely illustrative examples of the present invention and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope and spirit of the invention, and it will be obvious that such changes and modifications fall within the scope of the appended claims Inside.

Embodiment 1

[0081] 94% by weight of LiNi as the positive electrode active material 0.8 co 0.1 mn 0.1 o 2 (NCM), 3% by weight of carbon black (carbon black) as a conductive material, and 3% by weight of polyvinylidene fluoride (PVDF) as a binder were added to N-methyl-2-pyrrolidone as a solvent (NMP) to prepare positive electrode active material slurry. The positive electrode active material slurry was applied to an aluminum (Al) film having a thickness of about 20 μm as a positive electrode current collector, dried, and then roll pressed to manufacture a positive electrode.

[0082] 96% by weight of carbon powder as a negative active material, 3% by weight of PVDF as a binder, and 1% by weight of carbon black as a conductive material were added to NMP as a solvent to prepare a negative electrode Active Material Slurry. The anode active material slurry was applied to a copper (Cu) thin film having a thickness of about 10 μm as an anode current collector, dried, and then roll pressed t...

Embodiment 2

[0089] A lithium secondary battery was fabricated in the same manner as in Example 1, except that a current of 500 W was applied for 5 hours by operating the inductor while 0.5 kgf / cm 2 pressure.

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Abstract

The present invention provides a method for manufacturing a lithium secondary battery, comprising the steps of: injecting a composition for a gel polymer electrolyte into a lithium secondary battery case in which an electrode assembly including a metal electrode current collector is embedded, and then, sealing the lithium secondary battery case; positioning the lithium secondary battery case on the inside of a fixing member having an electromagnetic field generation means; and heating the metal electrode current collector by using the electromagnetic field generation means, so as to thermallycure the composition for a gel polymer electrolyte.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0062561 filed with the Korean Intellectual Property Office on May 31, 2018, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a method for manufacturing a lithium secondary battery, and more particularly, to a method for manufacturing a lithium secondary battery with an improved A method for battery performance and safety of lithium secondary batteries. Background technique [0004] Recently, with the rapid increase in demand for portable electronic products such as notebook computers, video cameras, and mobile phones, and the urgent development of electric vehicles, energy storage batteries, robots, satellites, etc., high-performance batteries that can be repeatedly charged and discharged are being actively researched. secondary battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0565H01M10/052H05B6/10
CPCH01M10/0565H01M10/052H01M10/058Y02E60/10Y02P70/50H01M2300/0085H01M2300/0082H05B6/10H01M10/0525H05B6/105
Inventor 申元景安庆昊李在原李哲行
Owner LG ENERGY SOLUTION LTD
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