Solid-State Battery and Method for Manufacturing the Same

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This invention introduces a method for fabricating electrodes in solid-state batteries, especially for sodium-ion and lithium-ion types. The process involves creating a multi-layer ceramic solid electrolyte with both dense and porous layers. An infiltration fluid containing dissolved precursor compounds for the electrode material is introduced into the porous layer, followed by heat treatment in a reducing atmosphere. This causes the active electrode material to form directly and uniformly on the internal surfaces of the porous structure. The resulting battery exhibits high ionic conductivity and improved structural and cycling stability, making it safer and more efficient, particularly for room-temperature operation.

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• Solid-state sodium-ion or lithium-ion batteries for grid energy storage (e.g., supporting renewables like wind/solar)
• Rechargeable batteries for electric vehicles requiring high safety standards
• Stationary backup power systems that need long cycle life and stability at room temperature
• Advanced consumer electronics where non-flammable, high-performance batteries are vital
• Industrial power supplies and aerospace applications where operational safety and reliability are critical

BenefitsContent extracted from patent full text and abstract with AI.

• Enhanced safety due to the elimination of flammable liquid electrolytes and use of ceramic solids
• Improved battery performance at room temperature, including high capacity retention and cycle stability
• Superior ionic conductivity in the electrolyte enables efficient charge/discharge
• Better tolerance to electrode expansion/shrinkage, minimizing degradation and prolonging life
• Flexible manufacturing process applicable to a range of electrode materials for both anodes and cathodes
• Potentially lower cost and less reliance on scarce resources compared to conventional lithium-ion batteries
• Minimized risk of cross-contamination and solid-electrolyte interface degradation
• Scalable approach suitable for industrial-scale battery production

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Patent Abstract

The invention relates to a method for producing an electrode for a solid state battery, in which method a multi-layer ceramic solid electrolyte is provided, which comprises at least one dense layer and one porous layer and has a total ion conductivity of at least 1 mS / cm at 25 °C. An infiltration fluid is provided, in which at least one precursor of an electrode material is present in solution. Said infiltration fluid is introduced into the porous region of the solid electrolyte. The solid electrolyte is subjected to a thermal treatment in a reductive atmosphere at temperatures of between 400 °C and 900 °C, whereby the electrode material is synthesized in situ on the surface of the pores from the precursor of the electrode material. The solid state battery according to the invention comprises a multi-layer ceramic solid electrolyte, which comprises at least one dense layer and one porous layer and in the case of which the dense layer has a total ion conductivity of at least 1 mS / cm at 25 °C. The porous layer has continuous and open pores having an average diameter of less than 10 μm, on the surface of which pores the active electrode material produced in situ is arranged.