Nonaqueous electrolyte and lithium secondary battery comprising same
A non-aqueous electrolyte with a cyclic carbonate-based solvent and sulfonamide additives addresses gas generation and stability issues in lithium secondary batteries, enhancing durability and performance.
WO2026142209A1PCT designated stage Publication Date: 2026-07-02LG ENERGY SOLUTION LTD
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- LG ENERGY SOLUTION LTD
- Filing Date
- 2025-12-19
- Publication Date
- 2026-07-02
AI Technical Summary
Technical Problem
Lithium secondary batteries face issues with gas generation, reduced lifespan, and safety due to electrolyte decomposition and excessive side reactions, particularly at high temperatures, which degrade the solid electrolyte interface layer and increase resistance.
Method used
A non-aqueous electrolyte comprising a cyclic carbonate-based organic solvent, a sulfonamide-based compound, and a combination of specific additives that minimize gas generation, protect the negative electrode, and enhance stability and durability.
Benefits of technology
The solution prevents the destruction of the SEI film, improves oxidative and chemical stability, reduces resistance, and extends the lifespan of lithium secondary batteries.
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Smart Images
Figure PCTKR2025022421-APPB-IMG-000001 
Figure PCTKR2025022421-APPB-IMG-000002 
Figure PCTKR2025022421-APPB-IMG-000003
Abstract
The present invention relates to a nonaqueous electrolyte and a lithium secondary battery comprising same. The nonaqueous electrolyte comprises a lithium salt, an organic solvent, and an additive, wherein the organic solvent comprises a cyclic carbonate-based organic solvent and a compound represented by chemical formula 1, the cyclic carbonate-based organic solvent comprises ethylene carbonate, the additive comprises a first additive and a second additive, the first additive comprises a compound represented by chemical formula 2, and the second additive comprises a compound represented by chemical formula 3. The definitions of chemical formula 1, chemical formula 2, and chemical formula 3 are as described in the present specification.
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