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Packaging for flexible secondary battery and flexible secondary battery comprising same

A secondary battery, flexible technology, applied in secondary battery manufacturing, large-size batteries/battery packs, small-size batteries/battery packs, etc., can solve problems such as battery performance degradation, and achieve the effect of reducing stress

Active Publication Date: 2021-02-05
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vapor entering the battery passes through with the use of LiPF 6 Water in the electrolyte solution that is a lithium salt reacts and becomes a major factor that causes battery performance to deteriorate

Method used

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  • Packaging for flexible secondary battery and flexible secondary battery comprising same
  • Packaging for flexible secondary battery and flexible secondary battery comprising same
  • Packaging for flexible secondary battery and flexible secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Formation of Mechanical Support Layers - Reduced Graphene Oxide Layers

[0117] A polyethylene terephthalate film (LAMI-ACE, laminated film) was prepared as a mechanical support layer.

[0118] In order to form a reduced graphene oxide layer on the mechanical support layer, graphene oxide particles (graphene oxide powder (graphene oxide powder), Standard Graphene) were put into deionized water, and energy was applied using an ultrasonic dispersion device to prepare a concentration of 1 mg / mL of graphene oxide dispersion composition. Subsequently, CuCl was added in an amount of 1% by weight based on the weight of graphene oxide 2 (Sigma Aldrich, CuCl 2 ) added to the dispersion composition. The dispersion composition was poured onto the prepared mechanical support layer (ie, polyethylene terephthalate (PET) film), then coated by barcoating and dried to form a graphene oxide layer. The formed graphene oxide layer was immersed in a hydriodic acid solution (TCI, 57% ...

Embodiment 2

[0134] Formation of heat-shrinkable layer-reduced graphene oxide layer

[0135] A modified polyvinylidene fluoride film (YoulChon Chemical) was prepared as the heat-shrinkable layer.

[0136] Graphene oxide particles (graphene oxide powder (graphene oxide powder), StandardGraphen) were put into deionized water, and energy was applied by an ultrasonic dispersion device to prepare a graphene oxide dispersion composition with a concentration of 1 mg / mL. Subsequently, CuCl was added in an amount of 1% by weight based on the weight of graphene oxide 2 (Sigma Aldrich, CuCl 2 ) added to the dispersion composition. The dispersion composition was poured onto the prepared heat-shrinkable layer, and then coated by barcoating and dried to form a graphene oxide layer. The formed graphene oxide layer was immersed in a hydriodic acid solution (TCI, 57% Hydrodic acid) at 90° C. and kept for more than 12 hours. The formed reduced graphene oxide layer was taken out from the hydriodic acid...

Embodiment 3

[0141] The mechanical support layer-reduced graphene oxide layer was obtained by the method described in Example 1.

[0142] A heat-shrinkable tube (Youl Chon Chemical, modified polyvinylidene fluoride tube) was applied as a heat-shrinkable layer to the outside of the mechanical support layer-reduced graphene oxide layer by lamination. In this case, the surface of the reduced graphene oxide layer was modified by UVO oxidation treatment so that the surface energy of the heat-shrinkable layer was equal to that of the reduced graphene oxide. The contact angle of a water droplet was used to determine whether the surface energy of the heat-shrinkable layer and the surface energy of the reduced graphene oxide layer were equal.

[0143] Subsequently, a package for a flexible secondary battery and a flexible secondary battery were obtained by the same method as in Example 1, wherein the package for a flexible secondary battery was wound around the outer surface of the electrode assemb...

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Abstract

The present invention is to improve the moisture barrier performance and flexibility of flexible secondary batteries, and provides a packaging for a flexible secondary battery and a flexible secondarybattery comprising same. The packaging for a flexible secondary battery has a tubular form surrounding the outer surface of an electrode assembly, and comprises: a mechanical support layer; a reducedgraphene oxide (rGO) layer disposed on the upper surface of the mechanical support layer and comprising a plurality of reduced graphene oxide sheets; a heat-shrink layer disposed on the upper surfaceof the reduced graphene oxide layer; and a sealant layer disposed on the upper surface of the heat-shrink layer, wherein the plurality of reduced graphene oxide sheets in the reduced graphene oxide layer have electrostatic interactions formed between the reduced graphene oxide sheets adjacent to each other.

Description

technical field [0001] This application claims the benefit of Korean Patent Application No. 10-2018-0125543 filed with the Korean Intellectual Property Office on October 19, 2018, the disclosure of which is hereby incorporated by reference in its entirety. [0002] The present disclosure relates to a package for a flexible secondary battery and a flexible secondary battery including the package. Background technique [0003] Secondary batteries are designed to convert external electrical energy into a form of chemical energy, store it, and generate electricity when needed. Since the secondary battery can be charged multiple times, the secondary battery is also called a "rechargeable battery". Commonly used secondary batteries include lead-acid batteries, nickel-chromium batteries (NiCd), nickel-metal hydride batteries (NiMH), lithium-ion (Li-ion) batteries, and lithium-ion polymer (Li-ion polymer) batteries. Secondary batteries offer both economic and environmental advanta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/105H01M50/107H01M50/124H01M50/136H01M50/141H01M50/14B32B33/00B32B7/12B32B27/32B32B27/30H01M10/04H01M10/058H01M50/10
CPCB32B33/00Y02E60/10H01M10/052H01M50/107H01M50/202H01M50/231H01M50/238H01M50/24Y02P70/50B32B7/12B32B2255/10B32B27/16B32B27/308B32B2255/28B32B27/34B32B2307/732B32B27/28B32B27/286B32B27/285B32B2307/7244B32B2250/03B32B27/32B32B2457/10B32B27/281B32B2307/558B32B2553/00B32B27/365B32B2255/20B32B1/08B32B2307/7246B32B27/36B32B2307/728B32B2307/73B32B2307/736B32B2307/546B32B27/288B32B27/304B32B27/322B32B27/08B32B2250/24H01M50/126H01M50/136H01M50/10H01M10/058H01M50/129H01M50/117H01M50/105H01M50/133H01M50/141H01M50/186H01M50/131H01M50/183
Inventor 林骏源权友涵严仁晟李在宪
Owner LG ENERGY SOLUTION LTD
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