Electrolyte Comprising a Phospite as an Additive or Co-Solvent, Lithium Rechargeable Battery Comprising Said Electrolyte, and Method for Producing the Phosphite

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This invention describes a specialized electrolyte for lithium rechargeable batteries that contains a phosphite compound as an additive or co-solvent. By including phosphites with specific molecular structures in the battery electrolyte, the invention significantly reduces flammability and enhances performance, particularly at higher operational voltages. The patent also covers the synthesis method for these phosphite compounds and their use in improving the lifespan and safety of lithium-ion batteries.

Use CasesContent extracted from patent full text and abstract with AI.

• Lithium-ion batteries for electric vehicles (EVs) where safety and high energy density are crucial.
• Stationary energy storage systems that require long battery life and minimal fire risks.
• Consumer electronics such as smartphones, laptops, and tablets needing high-performance, safer batteries.
• High-voltage battery applications requiring stable cycling and reduced degradation over time.
• Industrial and grid-scale energy storage solutions where battery safety is paramount.

BenefitsContent extracted from patent full text and abstract with AI.

• Markedly reduces electrolyte flammability, making batteries safer and lowering fire hazards.
• Maintains or improves cycling stability and longevity even at higher charging voltages, leading to longer battery life.
• Enables use in high-voltage lithium-ion cells, expanding application potential for technologies demanding higher energy density.
• Allows for lower additive concentrations to achieve non-flammability, minimizing impact on battery performance.
• Can be synthesized efficiently and incorporated into current battery manufacturing processes.

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Inventors & Applicants

Patent Abstract

The invention relates to an electrolyte, comprising: at least one lithium salt; at least one first and one second organic solvent, the first organic solvent having a dielectric constant of more than 90 (at 40°C), and the second organic solvent having a boiling point of below 110°C; and at least one phosphite of formula (I), where R1 is a n-propoxy group, an iso-propoxy group, a tert-butoxy group, an n-pentafluoropropoxy group, an n-trifluoropropoxy group, an iso-hexafluoropropoxy group, or a tert-nonafluorobutoxy group, and R2, R3, R4 and R independently of one another, are selected from among H, a trifluoromethyl group, or a C2-C6-alkyl group which is substituted by a trifluoromethyl group. The invention also relates to the use of an electrolyte comprising a phosphite of formula (I), and to a lithium rechargeable battery comprising said electrolyte.