Lithium Secondary Battery Comprising a Non-Aqueous Electrolyte Comprising a Non-Aqueous Solvent and a Mixed Lithium Salt

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This invention is a lithium secondary (rechargeable) battery that uses a specially formulated non-aqueous electrolyte to improve performance. The electrolyte combines a non-aqueous solvent with a mixed lithium salt system consisting of a fluorosulfonylimide-based lithium salt and lithium hexafluorophosphate (LiPF6). The cathode is built on an aluminum current collector and uses a lithium-manganese-rich oxide as the active material. Together, these components are designed to enhance the electrochemical stability and overall performance of the battery.

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• Electric vehicles requiring high-energy-density rechargeable batteries with improved cycle life.
• Grid-scale stationary energy storage systems where long-term stability of the electrolyte and cathode is critical.
• Consumer electronics such as laptops and smartphones that benefit from higher capacity cathode materials.
• Power tools and industrial equipment demanding robust battery performance under high-current conditions.
• Next-generation battery research and development targeting lithium-manganese-rich oxide cathode chemistries.

BenefitsContent extracted from patent full text and abstract with AI.

• The mixed lithium salt electrolyte (fluorosulfonylimide + LiPF6) improves ionic conductivity and electrochemical stability compared to single-salt electrolytes.
• Use of lithium-manganese-rich oxide as the cathode active material enables higher energy density than conventional lithium-ion cathode materials.
• The combination of the mixed salt electrolyte with the aluminum current collector reduces corrosion risk while maintaining low interfacial resistance.
• The fluorosulfonylimide-based salt component enhances the formation of a stable solid-electrolyte interphase (SEI), improving cycle life.
• Replacing or supplementing LiPF6 with a fluorosulfonylimide salt improves thermal stability of the electrolyte, reducing safety risks at elevated temperatures.

Inventors & Applicants

Patent Abstract

The present invention relates to a lithium secondary battery, comprising an anode, a cathode, and a non-aqueous electrolyte; wherein the non-aqueous electrolyte comprises a non-aqueous solvent and a lithium mixed salt; the lithium mixed salt comprises a fluorosulfonylimide-based lithium salt and LiPF6; the cathode comprises a cathode current collector; the cathode current collector comprises aluminum; the cathode further comprises a cathode active material; and the cathode active material comprises lithium manganese-rich oxide.