Solid Electrolyte Interphase Stability in Silicon Anode Batteries

Lithium-based composite anodes for dendrite-free all-solid-state batteries that prevent lithium metal dendrite formation during operation. The anode composition comprises metallic lithium and a metal sulfide, where the metal sulfide is either deposited as a continuous layer or dispersed within the lithium metal lattice. The sulfide reacts with lithium to form lithium sulfide and an alloy of lithium and metal, resulting in reduced dendrite growth and improved battery performance.

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Lithium secondary battery with improved safety features through the use of a novel solid electrolyte interface layer. The battery comprises a solid electrolyte comprising a sulfide material, a cathode active material, and a protective layer deposited on the sulfide layer surface. The protective layer, which is deposited through magnetron sputtering, acts as a barrier against water vapor and facilitates the formation of a stable interface between the cathode active material and the solid electrolyte. This layer enhances the solid-solid interface properties, particularly in humid environments, while maintaining the structural integrity of the solid electrolyte.

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Solid-state lithium metal battery with interface modification layer that improves interface contact and reduces interface resistance. The battery comprises a solid electrolyte with an interface modification layer, where the modification layer is prepared through a controlled precursor solution deposition process. The interface modification layer enables enhanced interface contact between the solid electrolyte and lithium metal anode, while maintaining compatibility with the anode material. This approach addresses the interface resistance issues in solid-state lithium metal batteries, enabling higher energy density and improved safety.

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A lithium-ion battery negative electrode comprising a composite material containing lithium silicon, oxygen, and nitrogen, a conductive agent, and a binder. The material combines the benefits of high lithium-ion energy density with improved cycle performance and expansion properties, particularly in applications requiring high cycle life and swelling resistance. The composite material is prepared through a controlled reaction between lithium silicon and oxygen-based precursors, followed by incorporation of nitrogen to enhance the material's electrical conductivity and mechanical properties.

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Solid-state battery design that enables higher power density and faster charging rates through a novel interface layer between the solid electrolyte and lithium metal anode. The interface layer incorporates an electron-conductive material with a conductivity greater than that of the solid electrolyte, which significantly reduces interface resistance and improves critical current density. The layer can be formed through various methods, including depositing a metal oxide layer on the solid electrolyte surface or incorporating a conductive polymer layer. This interface layer enables the formation of solid-state batteries that can achieve power densities comparable to lithium-ion batteries while maintaining safety.

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Solid electrolyte-lithium composite for all-solid-state lithium secondary batteries, comprising a solid electrolyte with a first main surface and a second main surface opposite thereto, and a lithium-containing layer compounded on the first main surface. The lithium-containing substrate includes metal lithium or a lithium alloy. The solid electrolyte is prepared by coating a lithium-containing substrate on the first main surface in a molten state or vapor-depositing the lithium-containing substrate on the first main surface.

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Lithium metal solid-state battery with a novel interface layer that prevents lithium metal decomposition of the solid electrolyte. The layer is formed by reacting lithium metal with an acid dissolved in a non-aqueous solvent, resulting in a salt or compound that conducts lithium ions while preventing electron conduction. This interface layer acts as a barrier between the lithium metal anode and the solid electrolyte, preventing the formation of unwanted lithium salt layers and maintaining uniform current distribution across the anode surface.

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Lithium-based negative electrode material for solid-state batteries that enables improved interface compatibility between the negative electrode and solid electrolyte. The material is prepared through a novel hot-melting and compounding process that optimizes lithium metal viscosity, surface energy, and carbon content. This approach enables precise control of interface properties, including interface resistance, which is critical for achieving high cycle stability and preventing dendrite formation. The material's composition can be precisely tailored to optimize interface compatibility with the solid electrolyte, enabling reliable operation in solid-state batteries.

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Lithium anode with inorganic protective coating and preparation method for enhancing electrode stability in lithium-ion batteries. The coating layer, comprising a uniform inorganic material, prevents electrolyte side reactions, promotes uniform lithium ion deposition, and inhibits dendrite growth. The coating method enables the deposition of the protective material through various techniques, including knife coating, spin coating, spray coating, and dropping. The resulting anode exhibits improved safety and cycle stability compared to conventional lithium metal anodes.

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A porous current collector for lithium-ion batteries that prevents lithium dendrite formation and enhances cycle performance. The collector comprises a porous structure with a high surface area and controlled pore size distribution, which is prepared through a novel sol-gel method. The porous structure acts as a barrier to lithium migration between electrodes, preventing the formation of dendrites and maintaining a stable surface chemistry. This design enables high-energy density batteries with improved safety and cycle life compared to conventional current collectors.

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Solid composite lithium metal negative electrode for lithium metal batteries that combines conductive framework material with solid electrolyte protection. The electrode comprises a composite layer of upper and lower layers, including a surface solid electrolyte protective layer and a metal lithium framework at the bottom. This multi-layer design addresses both the mechanical stability of the framework material and the safety concerns of lithium dendrite growth, while maintaining the high surface area and conductivity of the metal lithium.

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A method for preparing a negative electrode layer in lithium-ion batteries that enhances uniformity and stability of lithium metal incorporation. The method involves forming a metal mixture on a current collector surface, heating it to melt the lithium, and then creating a metal framework comprising a combination of metals or metal compounds with lithium. The resulting mixed metal framework is filled with melted lithium metal, providing a uniform distribution of lithium within the negative electrode structure. This approach improves the stability of the negative electrode layer by ensuring consistent lithium distribution throughout the framework.

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Surface treatment of hard carbon negative electrodes in lithium-ion batteries to enhance charge/discharge performance without compromising safety. The treatment involves a two-step process: first, carbon powder is graphitized at high temperatures followed by electrophoretic deposition of a uniform SEI layer. This dense SEI layer prevents the irreversible capacity loss associated with SEI formation during the first charge/discharge cycles. The treatment enables high-performance cycling with improved rate capability and stability, while maintaining the safety characteristics of the electrode material.

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Reducing interfacial resistance between electrode and solid electrolyte in lithium-ion batteries through a novel solid electrolyte deposition process. The process involves depositing a mixed electrolyte layer on the electrode surface, followed by depositing a solid electrolyte layer on the mixed electrolyte layer. This creates a uniform interface between the electrode and electrolyte, enabling high current densities during charging and discharging while maintaining optimal ionic conductivity.

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Lithium metal electrode for lithium metal batteries that prevents volume expansion and dendrite growth during charging and discharging. The electrode comprises a foam substrate with multiple cell cavities, where lithium particles are distributed within these cavities. The foam material is a metal foam or carbon foam, providing excellent structural integrity and mechanical properties. This design enables the electrode to maintain its shape and prevent lithium dendrite formation during charge/discharge cycles, while maintaining the high theoretical specific capacity of lithium metal.

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Preparing a composite lithium negative electrode for solid-state batteries through electrodeposition or hot-melt infusion using a three-dimensional carbon material or foamed porous material as a carrier. The carrier material facilitates controlled deposition of lithium metal in a three-dimensional structure, mitigating dendrite formation and electrode volume changes, while improving stripping behavior. This approach enables high-performance lithium metal electrodes with improved Coulomb efficiency and reduced electrode volume changes compared to traditional lithium metal foil electrodes.

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A method for modifying the interface of lithium metal anodes in lithium-ion batteries through liquid-phase chemical replacement. The method involves immersing the anode in a solution containing a heterogeneous metal ion or chemical, followed by controlled drying to form a thin metal layer on the anode surface. This layer acts as a barrier between the anode and electrolyte, preventing dendrite formation and lithium depletion during charging cycles. The metal layer can be composed of various elements, including copper, manganese, cobalt, nickel, iron, zinc, gold, silver, and platinum, each with controlled proportions and thicknesses.

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Passivated metal lithium-carbon framework composite material for lithium-ion batteries, comprising a porous carbon material carrier and metallic lithium distributed within the pores. The composite material contains carbon nanotubes with controlled concentrations, enabling efficient lithium distribution while preventing dendrite formation during charging. The material is prepared through a simple dispersion process, allowing for scalable production of high-performance lithium-ion battery electrodes.

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A high-capacity solid-state lithium-ion battery negative electrode material and method that enables enhanced performance in lithium-ion batteries through a novel electrode architecture. The material comprises an active material coated on a current collector substrate, a three-dimensional network polymer electrolyte with conductivity > 10^-3 S/cm after activation, and a current collector substrate. The substrate undergoes hydrogen peroxide treatment before coating, followed by natural drying. This approach enables high-capacity battery performance while maintaining excellent electrochemical stability and mechanical integrity.

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Silicon-carbon composite anode materials for lithium-ion batteries that achieve high volume volume and cyclic performance of the synthetic SEI layer. The materials contain nanometer-sized silicon powder and mesocarbon microspheres, which are combined with high-temperature petroleum asphalt and polyvinylidene fluoride (PVDF) to create a composite anode structure. The composite anode exhibits superior SEI stability and volume retention compared to conventional silicon-carbon anodes, enabling higher energy density batteries with improved cycle life.

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