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Polymer electrolyte having multi-layer structure, and all-solid battery comprising same

An all-solid battery, multi-layer structure technology, applied in non-aqueous electrolyte batteries, electrolytes, non-aqueous electrolytes, etc., can solve problems such as being unsuitable for manufacturing high-power and high-capacity batteries, reducing interface resistance, and improving output characteristics. and the effect of energy density, interface resistance reduction, and sufficient discharge capacity

Active Publication Date: 2018-01-26
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, attempts to improve the performance of such all-solid-state batteries have failed to sufficiently reduce the interfacial resistance between positive or negative active materials and solid electrolyte materials, making them unsuitable for manufacturing high-power and high-capacity batteries.

Method used

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  • Polymer electrolyte having multi-layer structure, and all-solid battery comprising same
  • Polymer electrolyte having multi-layer structure, and all-solid battery comprising same
  • Polymer electrolyte having multi-layer structure, and all-solid battery comprising same

Examples

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preparation example 1

[0076] 1. Mix PEO (Mw≒4,000,000) and LiFSI in acetonitrile (AN) at a molar ratio of EO:Li=5:1.

[0077] 2. Using the above solution to prepare a 3 μm polymer electrolyte membrane, namely PEO, by solution casting method 5 -LiFSI film.

preparation example 2

[0079] 1. Mix PEO (Mw≒4,000,000) and LiFSI in acetonitrile (AN) at a molar ratio of EO:Li=20:1.

[0080] 2. Using the above solution to prepare a 20 μm polymer electrolyte membrane, namely PEO, by solution casting method 20 - LiFSI film.

preparation example 3

[0082] 1. Mix PEO (Mw≒4,000,000) and LiFSI in acetonitrile (AN) at a molar ratio of EO:Li=20:1.

[0083] 2. To the solution to become PEO 20 - An amount of 10% by weight of LiFSI was mixed into PEGDA (n=10) and initiator BPO (benzoyl peroxide), then stirred until a homogeneous solution was obtained. At this time, BPO was mixed so as to be 1% by weight of PEGDA.

[0084] 3. Using the above mixed solution to prepare a 20 μm polymer electrolyte membrane, namely PEO, by solution casting method 20 - LiFSI-X film.

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Abstract

The present invention relates to a polymer electrolyte for an all-solid battery, having a multi-layer structure and, more particularly, to a polymer electrolyte having a multi-layer structure, which comprises a first polymer electrolyte layer and a second polymer electrolyte layer, wherein the EO:Li molar ratio of a poly(ethylene oxide)(PEO)-based polymer and a lithium salt is different between the first and second polymer electrolyte layers. The application of the solid polymer electrolyte of the present invention to the all-solid battery can remarkably reduce the interfacial resistance withlithium and the discharge overvoltage, resulting in a sufficient discharge capacity, and can improve output characteristics and energy density.

Description

technical field [0001] This application claims priority over Korean Patent Application No. 10-2015-0151630 filed with the Korean Intellectual Property Office on October 30, 2015 and Korean Patent Application No. 10-2016-0141786 filed with the Korean Intellectual Property Office on October 28, 2016 rights and interests, the entire contents of which are incorporated herein by reference. [0002] The present invention relates to a polymer electrolyte having a multilayer structure for an all-solid battery, and more particularly, to a polymer electrolyte having a multilayer structure, the polymer electrolyte comprising a first polymer electrolyte layer and a second polymer electrolyte layer , wherein the EO:Li molar ratio of poly(ethylene oxide) (PEO)-based polymer to lithium salt is different between the first and second polymer electrolyte layers. Background technique [0003] In recent years, demand for secondary batteries has increased in various applications as power source...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0568H01M10/0585H01M10/052H01M50/414H01M50/449H01M50/497
CPCH01M10/052H01M10/0565H01M2300/0082Y02E60/10H01M50/449Y02P70/50H01M50/497H01M50/414H01M10/0568H01M10/0585H01M10/056H01M2300/0094
Inventor 高童郁梁斗景朴恩囧蔡宗铉
Owner LG ENERGY SOLUTION LTD