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Solid electrolyte, method for preparing same, and all-solid-state battery including same

A technology of electrolyte and solid polymer, which is applied in the direction of solid electrolyte, non-aqueous electrolyte battery, electrolyte immobilization/gelation, etc. It can solve the problems of battery performance degradation, difficult battery manufacturing process, and increased internal pressure of the battery, and achieve high Mechanical stability and voltage stability, and the effect of improving ionic conductivity

Pending Publication Date: 2020-12-04
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if a liquid electrolyte as described above is used, not only the deterioration of the electrode material and the volatilization of the organic solvent are highly likely to occur, but there is also a safety hazard due to combustion caused by an increase in the ambient temperature and the temperature of the battery itself. sexual problems
In particular, lithium secondary batteries have problems in that during charge and discharge, gas is generated inside the battery due to decomposition of organic solvents and / or side reactions between organic solvents and electrodes, thereby expanding the thickness of the battery, and in During high temperature storage, the reaction is accelerated and the amount of gas produced further increases
[0004] Such continuously generated gas causes an increase in the internal pressure of the battery, which causes the prismatic battery to expand and explode in a specific direction, or deforms the center of a specific surface of the battery, resulting in a decrease in safety, and also causes the battery to be damaged. Local differences in adhesion at the surface of the electrode, leading to the disadvantage that the electrode reaction does not occur equally throughout the electrode surface, thereby deteriorating battery performance
However, gel-type polymer electrolytes have the following disadvantages: there are still stability issues and difficulties in the battery manufacturing process
However, there are still problems of ionic conductivity, low mechanical strength and narrow operating voltage range

Method used

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  • Solid electrolyte, method for preparing same, and all-solid-state battery including same
  • Solid electrolyte, method for preparing same, and all-solid-state battery including same
  • Solid electrolyte, method for preparing same, and all-solid-state battery including same

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preparation example Construction

[0051] The present invention provides a solid polymer electrolyte, which comprises multifunctional acrylate polymer, poly(C1 to C10 alkylene oxide), flame retardant polymer, lithium salt and non-aqueous solvent, wherein the multifunctional acrylate The polymer is cross-linked with the polyalkylene oxide to form a semi-interpenetrating polymer network (semi-IPN), and the flame retardant polymer is combined with the polyfunctional acrylate polymer and the polyalkylene oxide The semi-interpenetrating polymer network blending, the solid polymer electrolyte shows high solid content and flame retardancy; and the preparation method of the solid polymer electrolyte.

[0052] In the case of using existing polymer electrolytes of polyethylene oxide, there is a limitation of low ionic conductivity due to the high crystallinity of the polymer structure. However, in the case of the polymer electrolyte according to one embodiment of the present invention, by applying a polymer formed by cro...

Embodiment 1

[0111] By adding 2.5 g of polyethylene glycol diacrylate (PEGDA) as a monomer of a polyfunctional acrylate polymer, 0.15 g of polyethylene oxide (PEO, Mw= 600000g / mol to 1000000g / mol), 1.14M LiTFSI as lithium salt, 5.0g methylsulfonylmethane (DMSO 2 ) / 5.1g sulfolane, 0.07g phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (Irgacure 819) as photoinitiator and 1.0g Nofia HM1100 (FRX Polymer Corporation, P content: 11% by weight) which is a polyphosphonate-based polymer, and they were stirred at 120° C. for 24 hours to prepare an electrolyte composition.

[0112] The electrolyte composition was coated on a Teflon release film with a doctor blade and photopolymerized by applying ultraviolet rays. The solid polymer electrolyte in film form was obtained from a Teflon release film. Irradiation of ultraviolet rays was sequentially performed at a wavelength of 325 nm for 3 minutes, at a wavelength of 254 nm for 1 minute, and at a wavelength of 365 nm for 1 minute.

Embodiment 2

[0114] By adding 10 g of ethoxylated trimethylolpropane triacrylate (ETPTA) as a monomer of the polyfunctional acrylate polymer, 0.1 g of polyethylene oxide ( PEO, Mw=600000g / mol to 1000000g / mol), 0.68M LiTFSI as lithium salt, 12.6g methylsulfonylmethane (DMSO 2 ), 0.1 g of 2-hydroxyl-2-methylpropiophenone (HOMPP) as a photoinitiator, and 1.0 g of NofiaHM1100 (FRX Polymers, P content: 11% by weight) as a flame retardant polymer (which is poly phosphonate polymer), and they were stirred at 60° C. for 24 hours to prepare an electrolyte composition.

[0115] The electrolyte composition was coated on a Teflon release film with a doctor blade and photopolymerized by applying ultraviolet rays. The solid polymer electrolyte in film form was obtained from a Teflon release film. Irradiation of ultraviolet rays was sequentially performed at a wavelength of 325 nm for 5 minutes, at a wavelength of 254 nm for 2.5 minutes, and at a wavelength of 365 nm for 2.5 minutes.

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Abstract

The present invention relates to a solid polymer electrolyte and a method for preparing same. More specifically, the present invention relates to a solid polymer electrolyte and a method for preparingsame, the solid polymer electrolyte comprising a multifunctional acrylate-based polymer, C1 to C10 polyalkyleneoxide, a flame retardant polymer, a lithium salt, and a non-aqueous solvent, wherein themultifunctional acrylate-based polymer crosslinks with the polyalkyleneoxide so as to form semi-interpenetrating polymer networks (semi-IPNs), and the flame retardant polymer is blended with the semi-interpenetrating polymer networks of the multifunctional acrylate-based polymer and the polyalkyleneoxide so as to exhibit a high content of solids and flame retardant properties.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0103396 filed on August 31, 2018 and Korean Patent Application No. 10-2019-0100981 filed on August 19, 2019, which Korean Patent The entire content of the application is incorporated herein by reference. [0002] The present invention relates to a solid electrolyte, a manufacturing method thereof and an all-solid battery comprising the solid electrolyte. Background technique [0003] Currently, lithium-ion secondary batteries with high energy density, which are mainly used in notebooks and smartphones, are composed of a positive electrode made of lithium oxide, a carbon-based negative electrode, a separator, and an electrolyte. Conventionally, an ion-conductive organic liquid electrolyte in which a salt is dissolved in a liquid electrolyte, particularly a nonaqueous organic solvent, has been mainly used as an electrolyte. However, if a liquid electrolyte as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/42H01M10/052
CPCY02E60/10H01M10/052H01M10/0565H01M2300/0091H01M10/0567H01M10/0569H01M10/0568H01M2300/0085H01M10/4235H01M2300/0082H01M4/0471H01M4/131H01M4/134H01M4/364H01M10/0525H01M2300/004H01M2300/0071C08F290/141C08F12/14H01M50/411C08F20/14H01M50/417
Inventor 金大日蔡宗铉金秀桓林圣哲安智勋
Owner LG ENERGY SOLUTION LTD