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

A solid electrolyte membrane and solid-state battery technology, applied in the direction of solid electrolyte, electrolyte, non-aqueous electrolyte, etc., can solve problems such as explosion, fire, and damage to solid electrolyte membranes, prevent thermal runaway and explosion, and improve heat resistance and safety sexual effect

Pending Publication Date: 2021-12-03
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, when polymer materials are used as solid electrolytes, the solid electrolyte membrane may be damaged by the growth of lithium dendrites
When the electrolyte membrane is damaged as described above, current is concentrated in the damaged part, causing rapid heat release, resulting in fire and explosion
In particular, in the case of a large battery, a large amount of heat is generated due to a short circuit, so there is a problem that the above-mentioned problems may become more serious

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0081] First, polystyrene-polyethylene oxide block copolymer (polystyrene-co-polyethylene oxide, PS-b-PEO, room temperature ionic conductivity: 8 × 10 -8 S / cm) and polyethylene oxide (PEO, molecular weight (Mn): 600 kg / mol) were introduced into tetrahydrofuran (THF) as a solvent at a weight ratio of 2:8 to prepare a 5% by weight polymer solution. Here, PS-b-PEO is a copolymer including polystyrene (PS) blocks and polyethylene oxide (PEO) blocks, the blocks being bonded to each other at their respective terminals. In this copolymer, the PS block has a molecular weight (Mn) of 60 kg / mol and the PEO block has a molecular weight (Mn) of 18 kg / mol. Here, LiTFSI as a lithium salt is also represented by [EO] / [Li + ]=18 / 1 molar ratio is introduced. The polymer solution was stirred overnight at 60 °C so that the PS-b-PEO, PEO and lithium salt introduced therein could be fully dissolved. The polymer solution was coated by spin coating at 1000 rpm for 1 min and dried under vacuum over...

Embodiment 2

[0083] A solid electrolyte membrane was obtained in the same manner as in Example 1, except that PS-b-PEO and PEO were used in a weight ratio of 4:6, and the thickness of the obtained solid electrolyte membrane was 30 μm.

Embodiment 3

[0085]A solid electrolyte membrane was obtained in the same manner as in Example 1, except that PS-b-PEO and PEO were used in a weight ratio of 5:5, wherein PS-b-PEO was composed of polystyrene (PS) blocks and Copolymer of polyethylene oxide (PEO) blocks (the blocks are bonded to each other at their respective ends), the PS block has a molecular weight (Mn) of 26 kg / mol and an ionic conductivity of 5×10 - 7 S / cm (room temperature), the molecular weight (Mn) of the PEO block is 32 kg / mol, and the thickness of the obtained solid electrolyte membrane is 30 μm.

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Abstract

A solid electrolyte membrane according to the present invention comprises a polymer material having low ionic conductivity, by which an ionic conduction blocking layer is formed in the electrolyte membrane through polymer phase separation under high-temperature conditions such as increases in the internal temperature of a battery, and thus the movement of lithium ions is blocked. The formation of the ionic conduction blocking layer (hereinafter, referred to as blocking layer) prevents thermal runaway and battery explosion caused thereby, and thus the thermal resistance / safety of the battery is advantageously improved.

Description

technical field [0001] This application claims priority from Korean Patent Application No. 10-2019-0113061 filed in the Republic of Korea on September 11, 2019. The present invention relates to an electrolyte membrane for a solid-state battery having improved heat resistance and safety and exhibiting an improved shutdown function, and a solid-state battery including the electrolyte membrane. Background technique [0002] In a lithium-ion battery using a liquid electrolyte, when the battery is deformed by impact or external environment, the liquid electrolyte may leak outside the battery, or the electrolyte may burn due to a short circuit, etc., causing danger such as overheating or explosion. Therefore, it can be said that the development of a solid electrolyte capable of ensuring safety is a very important issue in the field of lithium ion secondary batteries. [0003] A lithium secondary battery using a solid electrolyte is advantageous in that it has enhanced safety, pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0562H01M10/0525
CPCH01M10/0565H01M10/0562H01M10/0525H01M2300/0068H01M2300/0082H01M50/411Y02E60/10H01M10/4235H01M2300/0071H01M10/056H01M2300/0065
Inventor 李廷弼姜盛中
Owner LG ENERGY SOLUTION LTD