A dual-phase electrolyte system suitable for lithium-oxygen batteries and application and lithium-oxygen battery thereof

By designing a two-phase electrolyte system suitable for lithium-oxygen batteries, the compatibility problem between the positive and negative electrode sides of lithium-oxygen batteries was solved, achieving high voltage tolerance and long cycle life, and improving the energy efficiency and discharge capacity of the battery.

CN122178023APending Publication Date: 2026-06-09CHANGCHUN INSTITUTE OF APPLIED CHEMISTRY CHINESE ACADEMY OF SCIENCES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGCHUN INSTITUTE OF APPLIED CHEMISTRY CHINESE ACADEMY OF SCIENCES
Filing Date
2026-01-28
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The electrolyte system of existing lithium-oxygen batteries cannot simultaneously meet the requirements of low charging overpotential on the positive electrode side and lithium stability on the negative electrode side, resulting in decreased battery reversibility and shortened cycle life.

Method used

A two-phase electrolyte system is designed in which lithium salt is dissolved in different organic solvents I and II to form homogeneous positive and negative electrode electrolytes. By adjusting the differences in hydrogen bonding and dispersion force parameters, the requirements of the positive and negative electrodes are met respectively. Acetonitrile is used as the positive electrode, which has good high voltage tolerance, and sulfolane is used as the negative electrode to form a lithium fluoride-rich SEI film.

Benefits of technology

This technology reduces side reactions on the positive electrode side of lithium-oxygen batteries, ensures uniform lithium deposition on the negative electrode side, improves battery energy efficiency and cycle life, generates amorphous discharge products, avoids decomposition during high-voltage stages, and extends battery life.

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Abstract

This invention discloses a two-phase electrolyte system suitable for lithium-oxygen batteries, its application, and the lithium-oxygen battery itself, belonging to the field of lithium-oxygen battery technology. The invention dissolves lithium salt in an organic solvent to form a homogeneous positive electrode electrolyte, and dissolves lithium salt in another organic solvent to form a homogeneous negative electrode electrolyte. The positive and negative electrode electrolytes are mixed and allowed to separate into layers to obtain the two-phase electrolyte system. Because the solvents on the negative and positive electrode sides have significantly different hydrogen bonding capabilities, the positive electrode solvent can be prevented from shuttling to the lithium negative electrode and causing corrosion. The nitrile electrolyte on the positive electrode side and the sulfone electrolyte on the negative electrode side ensure good stability for both the positive and negative electrodes of the lithium-oxygen battery, guaranteeing a long cycle life.
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