A solid-state composite electrode includes active electrode particles, ionically conductive particles, and electrically conductive particles. Each of the ionically conductive particles is at least partially coated with an isolation material that inhibits inter-diffusion of the ionically conductive particles with the active electrode particles. A battery cell includes a first current collector, a solid electrolyte layer, a first solid-state composite electrode having ionically conductive particles coated with an isolation material and positioned between the first current collector and the solid electrolyte layer, a second current collector, and a second electrode positioned between the solid electrolyte layer and the second current collector. A method of forming a solid-state composite electrode includes mixing together active electrode particles and electrically conductive particles with ionically conductive particles that are each at least partially coated with an isolation material. The mixture is formed into a film via tape-casting, and sintered at a temperature greater than 600° C.

A solid electrolyte material of the present disclosure includes Li, Zr, and F. A ratio of an amount of substance of Li to an amount of substance of Zr is less than 3.5. In an X-ray diffraction pattern obtained by an X-ray diffraction measurement of the solid electrolyte material using a Cu—Kα ray, a ratio of a value of a full width at half maximum of a peak having a highest intensity within a range of a diffraction angle 2θ from 27.5° to 29.5° to a value of a full width at half maximum of a peak corresponding to a (111) plane of Si in an X-ray diffraction pattern of Si measured under a same condition as in the X-ray diffraction measurement is more than 1.06.

A solid electrolyte material of the present disclosure includes Li, Zr, and F. A ratio of an amount of substance of Li to an amount of substance of Zr is 3.5 or more. In an X-ray diffraction pattern obtained by an X-ray diffraction measurement of the solid electrolyte material using a Cu-Kα ray, a ratio of a value of a full width at half maximum of a peak having a highest intensity within a range of a diffraction angle 2θ from 42.5° to 44.7° to a value of a full width at half maximum of a peak corresponding to a (111) plane of Si in an X-ray diffraction pattern of Si measured under a same condition as in the X-ray diffraction measurement is more than 1.19.

A solid electrolyte material of the present disclosure includes Li, Zr, Al, and F. A ratio of an amount of substance of F to a total of amounts of substance of anions constituting the solid electrolyte material of the present disclosure may be, for example, 0.50 or more and 1.0 or less. A battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer provided between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer includes the above solid electrolyte material of the present disclosure.

Passivated Li.sub.7La.sub.3Zr.sub.2O.sub.12 (LLZO) particles, tape casting powders and slip compositions including the particles, methods of forming the particles, methods of tape casting using the particles, green tapes including the particles, cast LLZO films formed from the particles, and lithium batteries including the cast LLZO film. A passivated LLZO particle includes an LLZO core, wherein the LLZO is optionally doped with one or more elements. The passivated LLZO particle also includes a shell including H-LLZO, H.sub.3O.sup.+-LLZO, and/or Li.sub.2CO.sub.3.

A method of co-extruding battery components includes forming a first thin film battery component via hot melt extrusion, and forming a second thin film battery component via hot melt extrusion. A surface treatment is applied to a surface region of at least one of the first and second components so that, relative to a remainder of the at least one component, the surface region has at least one of a decreased inter-particle distance, a decreased amount of polymer binder material, and an increased amount of exposed ionically conductive material. The first and second components are fed through a co-extrusion die to form a co-extruded multilayer thin film.

Provided is a battery comprising a cathode, an anode, and an electrolyte layer. The electrolyte layer includes a first electrolyte layer and a second electrolyte layer. The first electrolyte layer includes a first solid electrolyte material. The second electrolyte layer includes a second solid electrolyte material which is a material different from the first solid electrolyte material. The first solid electrolyte material includes lithium, at least one kind selected from the group consisting of metalloid elements and metal elements other than lithium, and at least one kind selected from the group consisting of chlorine, bromine, and iodine. The first solid electrolyte material does not include sulfur.

Provided are an inorganic solid electrolyte material including a sulfide-based inorganic solid electrolyte and an electron-insulating inorganic material that coats a surface of the sulfide-based inorganic solid electrolyte, is solid at 100° C., and fuses at a specific temperature, a slurry using the same, a solid electrolyte film for an all-solid state secondary battery, a solid electrolyte sheet for an all-solid state secondary battery, a positive electrode active material film for an all-solid state secondary battery, a negative electrode active material film for an all-solid state secondary battery, an electrode sheet for an all-solid state secondary battery, an all-solid state secondary battery, and a method for manufacturing an all-solid state secondary battery.

A boron-containing proton-exchange solid support may include a proton-exchange solid support comprising an oxygen atom and a tetravalent boron-based acid group comprising a boron atom covalently bonded to the oxygen atom.

An EB-PVD technique was used to fabricate ceramic/polymer/ceramic (LAGP/PE/LAGP) hybrid separator for rechargeable LIBs and Li batteries. The application of a ceramic electrolyte (LAGP) layer on traditional PE separator soaked in 1-M LiAsF.sub.6 liquid electrolyte combined the best attributes of traditional PE separator and solid inorganic electrolytes. The synergistic behavior of hybrid separator resulted in a high mechanical stability/flexibility, increased liquid uptake, high ion conduction, reduced cell voltage polarization, no lithium dendrite formation, and increased usable lithium content as compared to the state-of-the-art PE separator used in LIBs. The functional separator can be used to prolong life cycle and power capability of present LIBs. Thickness and density optimization of LAGP or similar electrolytes on polymer or other battery separators and their use in full Li battery (LIB, Li—S, Li—O.sub.2, Li—Ph, flow battery) cells are expected to further improve performance.