US12573664USUSPTO Grant XML

Electrolyte for a lithium secondary battery including an ionic liquid containing an ether functional group and a lithium secondary battery including the same

Disclosed is an electrolyte for a secondary battery that includes an ionic liquid containing an ether functional group, thereby providing effects of lowering the viscosity and improving lithium ion conductivity even when a molecular weight is increased.

Patent

Brief

Patent brief

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Novelty

Fire-resistant electrolytes is reinforced by front-page matches on electrolyte.

Uses

Lithium-ion cells, EV batteries, Grid storage

Assignee

HYUNDAI MOTOR COMPANY

Published

Mar 10, 2026

Inventors

Kyu Ju Kwak, Won Keun Kim, Eun Ji Kwon, Samuel Seo, Dong Hyun Lee, Kyoung Han Ryu, Yeon Jong Oh, Je Seung Lee, Dae Won Kim, Su Yeon Lee

Domain

Mobility / storage

Plain-English summary

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Solution

electrolyte for a secondary battery that includes an ionic liquid containing an ether functional group, thereby providing effects of lowering the viscosity and improving lithium ion conductivity even when a molecular weight is increased.

Key novelty

Fire-resistant electrolytes is reinforced by front-page matches on electrolyte.

Applications

Lithium-ion cellsEV batteriesGrid storage

Relevant search intents

electrolyte

Claims preview

1 . An electrolyte for a lithium secondary battery, the electrolyte comprising: an ionic liquid comprising a cation and an anion; and a metal salt, wherein the cation and the anion each comprises an ether group, and wherein the ionic liquid comprises up to 7 ether groups. 2 . The electrolyte of claim 1 , wherein the cation comprises pyrrolidinium, piperidinium, morpholinium, ammonium, phosphonium, or combinations thereof. 3 . The electrolyte of claim 1 , wherein the cation comprises: or combinations thereof, wherein R 1 , R 2 , R 3 , and R 4 each comprise a substituted or unsubstituted C1-C12 alkyl group, and wherein at least one of R 1 , R 2 , R 3 , and R 4 comprises an aliphatic compound comprising the ether group.

Linked approaches

Fire-resistant electrolytes

Electrolyte formulations that suppress ignition and heat release.

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