Lithium Battery, Lithium Battery Multi-Stack and Method for Producing the Same

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This invention describes a new method and structure for producing all-solid-state lithium batteries, particularly those using a sulfur-based solid electrolyte. The process involves forming the electrolyte layer on a metallic transfer substrate (like aluminum or stainless steel), then bonding it with the positive electrode and removing the substrate before adding the negative electrode, optionally with an adhesion-promoting polymer layer. Critical for long battery life, especially in stacked multi-cell designs, the battery uses sulfur-tolerant current collector materials (such as stainless steel or nickel) near the negative electrode to prevent chemical degradation.

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

• Electric vehicles (EVs) requiring high-energy, long-life, and safe solid-state batteries.
• Consumer electronics needing safer, compact, and more durable batteries.
• Grid-scale energy storage systems seeking improved cycle life and reduced safety risks.
• Wearable technology that benefits from stable, dense, and flexible solid-state battery cells.
• Aerospace and satellite applications where battery safety and energy density are crucial.
• Medical implants and portable devices that demand reliable, non-flammable battery systems.

BenefitsContent extracted from patent full text and abstract with AI.

• Improved manufacturing yield and reliability over previous methods, due to better transfer and adhesion of the solid electrolyte to electrodes.
• Enhanced safety compared to traditional liquid electrolyte batteries, as solid-state design is less flammable and more chemically stable.
• Enables construction of multi-stack batteries (serially connected cells) with high energy and power density.
• Greatly increases battery lifespan by preventing degradation due to reactions between sulfur-based electrolyte and current collectors, thanks to the use of sulfur-tolerant materials.
• Cost-effective and scalable process using widely-available metals for transfer substrates and current collectors.
• Potentially enables wider adoption of solid-state batteries in demanding applications due to improved durability and manufacturability.

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Patent Abstract

The invention relates to a method for producing an all-solid-state lithium battery, comprising a positive electrode, a negative electrode and a solid electrolyte layer arranged in between, wherein first a solid electrolyte is applied to a metallic transfer substrate, the side of the solid electrolyte layer opposite from the metallic transfer substrate is brought into contact and pressed together with a positive electrode, and the metallic transfer substrate is then removed from the solid electrolyte layer before a negative electrode is arranged on the free side of the solid electrolyte layer, directly or via an adhesion promoter layer. The invention also relates to an all-solid-state lithium battery or an all-solid-state lithium battery multi-stack, comprising a positive electrode, a negative electrode, a sulfur-based solid electrolyte arranged in between and at least one current collector, wherein an adhesion promoter layer is arranged between the negative electrode and the solid electrolyte, and/or at least one current collector, preferably all of the current collectors, comprise(s) a sulfur-tolerant material adjacent to the negative electrode.