Electrolyte for an electrochemical device, method for manufacturing same, and electrochemical device including same

An electrochemical and electrolyte technology, applied in the direction of non-aqueous electrolyte batteries, electrochemical generators, circuits, etc., can solve the problems of not having mechanical properties and complicated processes

Active Publication Date: 2013-09-25
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even in these cases, the electrolyte will not have sufficient mechanical properties to eliminate the need for a separator
Drying is required to remove the solvent used to dissolve the linear polymer, complicating the process

Method used

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  • Electrolyte for an electrochemical device, method for manufacturing same, and electrochemical device including same
  • Electrolyte for an electrochemical device, method for manufacturing same, and electrochemical device including same
  • Electrolyte for an electrochemical device, method for manufacturing same, and electrochemical device including same

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Experimental program
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Effect test

Embodiment 1

[0058] Embodiment 1: Preparation of PCE / PEGDMA / PEGMA solid electrolyte

[0059] For 50 parts by weight of succinonitrile as a plastic crystal electrolyte (PCE), 25 parts by weight of polyethylene glycol dimethacrylate (PEGDMA) with a weight average molecular weight of 400, and 25 parts by weight of polyethylene glycol dimethacrylate (PEGDMA) with a weight average molecular weight of 400 Alcohol methacrylate for mixing. Lithium bis(trifluoromethanesulfonyl)imide was added to the mixture in a molar ratio of lithium salt to PEGDMA and ethylene oxide units of PEGMA of 1:8. After homogenizing the mixture, benzoin as UV initiator was added to the mixture in an amount of 3% by weight, based on the total weight of PEGDMA and PEGMA.

[0060] Thereafter, the prepared mixture was cast on a glass plate and irradiated with UV light for 1 minute. As a result of the polymerization, an electrolyte is produced in the form of a membrane.

Embodiment 2

[0061] Embodiment 2: Preparation of PCE / PEO / PEGDMA / PEGMA solid electrolyte

[0062] For 50 parts by weight of succinonitrile, 25 parts by weight of polyethylene oxide, 12.5 parts by weight of polyethylene glycol dimethacrylate (PEGDMA) with a weight average molecular weight of 400 and 12.5 parts by weight of polyethylene glycol dimethacrylate (PEGDMA) with a weight average molecular weight of 400 Polyethylene glycol methacrylate for mixing. Lithium bis(trifluoromethanesulfonyl)imide was added to the mixture in a molar ratio of lithium salt to ethylene oxide units of PEO, PEGDMA and PEGMA of 1:8. After homogenizing the mixture, benzoin as UV initiator was added to the mixture in an amount of 3% by weight, based on the total weight of PEGDMA and PEGMA.

[0063] Thereafter, the prepared mixture was cast on a glass plate and irradiated with UV light for 1 minute. As a result of the polymerization, an electrolyte is produced in the form of a membrane.

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Abstract

The present invention relates to a solid electrolyte for an electrochemical device comprising a plastic crystal matrix electrolyte doped with ionic salt, and a complex of a polymer having a cross-linking structure including a chemically bonded linear polymer having a weight average molecular weight of 100 to 5,000 and one functional group, and to a method for manufacturing same. Since the electrolyte is obtained using the plastic crystal, the electrolyte has good ion conductivity which is a feature of a liquid electrolyte. Since the electrolyte includes the polymer having the cross-linking structure, the electrolyte has good mechanical strength which is a feature of a solid electrolyte. In addition, a solvent is not necessarily required while manufacturing the electrolyte, and therefore a drying process can be omitted to simplify the manufacturing process. The electrolyte has high ion conductivity and the mechanical strength of a solid electrolyte, and therefore the electrolyte can be used in a cable-type battery, the form of which is easily modified.

Description

technical field [0001] The present invention relates to an electrolyte for an electrochemical device, a method for preparing the electrolyte, and an electrochemical device including the electrolyte. More specifically, the present invention relates to a plastic crystal matrix electrolyte. Background technique [0002] This application claims priority from Korean Patent Application No. 10-2011-0006006 filed in Korea on January 20, 2011, the entire contents of which are incorporated herein by reference. [0003] A secondary battery is a representative electrochemical device in which external electrical energy converted into chemical energy is stored and electricity is generated when needed. A secondary battery is also called a "rechargeable battery" because it can be repeatedly charged and discharged. Lead acid batteries, nickel cadmium (NiCd) batteries, nickel metal hydride (NiMH) batteries, lithium ion batteries, and lithium ion polymer batteries are often used as secondary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052H01M10/0569C08J5/22
CPCC08J5/2275C08J2323/06H01M10/052H01M10/0565H01M10/0569Y02E60/10C08J5/22
Inventor 权友涵金帝映吴丙薰金奇泰
Owner LG ENERGY SOLUTION LTD
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