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Electrolyte membrane for all-solid-state battery, and all-solid-state battery including same

A technology of all-solid-state batteries and solid electrolyte membranes, applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, solid electrolytes, etc., can solve problems such as short circuits, and achieve the effects of improved life characteristics and uniform ion conductivity

Pending Publication Date: 2021-11-19
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium dendrites may grow in the space provided by this pore, and when the Lithium dendrite grown through this pore comes into contact with the positive electrode, a short circuit may occur

Method used

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  • Electrolyte membrane for all-solid-state battery, and all-solid-state battery including same
  • Electrolyte membrane for all-solid-state battery, and all-solid-state battery including same
  • Electrolyte membrane for all-solid-state battery, and all-solid-state battery including same

Examples

Experimental program
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Effect test

Embodiment 1

[0085] (1) Prepare the lower solid electrolyte membrane layer

[0086] Polyethylene oxide (PEO) (Mw=4,000,000 g / mol) was dissolved in a solvent of acetonitrile (AN) to prepare a 4% by weight polymer solution. In this case, the addition of lithium salt LiTFSI makes [EO] / [Li + ]=18 / 1 (molar ratio). The polymer solution was stirred overnight at 70 °C to fully dissolve the PEO and lithium salt. Subsequently, an additive solution including an initiator and a curing agent is prepared. The curing agent is polyethylene glycol diacrylate (PEGDA) (Mw=575), and the initiator is benzoyl peroxide (BPO). PEGDA was present in an amount of 20% by weight based on PEO and BPO was present in an amount of 1% by weight based on PEGDA. The solvent used was acetonitrile. The additive solution was stirred for about 1 hour to thoroughly mix the added ingredients. Subsequently, the additive solution was added to the polymer solution and the two solutions were thoroughly mixed together. Spread an...

Embodiment 2

[0094] A solid electrolyte membrane was prepared in the same manner as in Example 1, except that, in the preparation of the solid electrolyte membrane, the concentration of the guiding material was 2% by weight.

Embodiment 3

[0096] A solid electrolyte membrane was prepared in the same manner as in Example 1, except that, in the preparation of the solid electrolyte membrane, polystyrene-block-poly(2-vinylpyridine) (S2VP, PS Mn 133kg / mol , P2VP Mn 132kg / mol) as a block copolymer for the guiding layer.

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Abstract

The present invention pertains to: a solid electrolyte membrane for an all-solid-state battery; and a battery including same. In the present invention, the battery may include lithium metal as a negative electrode active material. The solid electrolyte membrane for an all-solid-state battery according to the present invention is provided with a guide layer containing metal particles. Accordingly, lithium dendrites grow in the horizontal direction, and thus there is the effect that electrical shorts caused by dendrite growth are delayed. In addition, since the guide layer is formed through self-assembly of a polymer material, metal particles can be uniformly distributed in a very uniform pattern in the guide layer.

Description

technical field [0001] This application claims the benefit of Korean Patent Application No. 10-2019-0045631 filed with the Korean Intellectual Property Office on April 18, 2019, the disclosure of which is hereby incorporated by reference in its entirety. The invention relates to an electrolyte membrane for an all-solid battery used for inhibiting the growth of lithium dendrites and an all-solid battery comprising the electrolyte membrane. Background technique [0002] In a lithium-ion battery using a liquid electrolyte, the anode and cathode are separated by a separator, and when the separator is damaged by deformation or external impact, a short circuit may occur, resulting in overheating or explosion. Therefore, it is very important to develop a safe solid electrolyte in the field of lithium ion secondary batteries. [0003] A lithium secondary battery using a solid electrolyte has enhanced battery safety, prevents leakage of the electrolyte, thereby improving battery rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/056H01M10/0525H01M10/0565H01M10/052Y02E60/10H01M10/4235H01M2300/0082H01M4/382H01M10/0562H01M4/13H01M2300/0091H01M2300/0068H01M2300/0071H01M50/446H01M2004/027H01M2004/028
Inventor 李廷弼金恩妃柳志勋李锡佑
Owner LG ENERGY SOLUTION LTD