Abstract: Disclosed are an apparatus and system for evaluating a welding condition on the basis of three-dimensional data. An aspect of the present embodiment provides an apparatus for evaluating a welding condition, the apparatus including a communication unit configured to receive a three-dimensional image for an evaluation target from the outside, a base material recognition unit configured to recognize a base material from the three-dimensional image for the evaluation target by using a point cloud, a bead extraction unit configured to extract a welding bead welded between the base materials, a bead cross-section acquisition unit configured to acquire cross-sections at preset intervals for the extracted welding bead, and a profile analysis unit configured to analyze a profile of the welding bead for the cross-section acquired by the bead cross-section acquisition unit.

Abstract: Disclosed is a battery residual value evaluation system, which includes a measurement unit that measures a voltage and a current of an external battery to generate a voltage signal and a current signal, a resistance calculation unit that generates a resistance value, a resistance change value, and a resistance change rate of the external battery for each of charging and discharging cycles of the external battery based on the voltage signal and the current signal, an external input unit that receives reference ranges from an outside, a determination unit that determines a battery residual value based on whether the resistance value, the resistance change value, and the resistance change rate fall within the reference ranges, respectively, and an output unit that outputs the determination result to the outside.

Abstract: An electrolyte composition of the inventive concept may include a solvent, an electrolyte salt, a first additive, and a second additive. The first additive may include at least one among a phosphor (P) compound, a nitrogen (N) compound, a sulfur (S) compound, and a lithium (Li) compound, or combinations thereof, and the second additive may include at least one among a carbonate compound, a sulfur (S) compound, and a lithium (Li) compound, or combinations thereof.

Abstract: The present disclosure relates to an all-solid-state secondary battery, and more particularly, to an all-solid-state secondary battery including a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive electrode and the negative electrode. Here, at least one of the positive electrode and the negative electrode includes a sulfide-based active material, the sulfide-based active material has a particle size of about 50 nm to about 5 µm, and the sulfide-based active material has a grain size of about 1 nm to about 10 nm.

Abstract: A lithium battery according to the inventive concept includes: a first electrode structure; a second electrode structure separated from the first electrode structure; and an electrolyte between the first electrode structure and the second electrode structure, wherein the electrolyte includes: a lithium salt; an organic solvent; and an additive, the additive includes a polymer additive, and the polymer additive may be a mixture of at least two or more polymers among a halogen-based polymer, a silicon-based polymer and an acrylic polymer, or a copolymer thereof.

Abstract: A lithium battery according to the inventive concept includes: a first electrode structure; a second electrode structure separated from the first electrode structure; and an electrolyte between the first electrode structure and the second electrode structure, wherein the electrolyte includes: a lithium salt; an organic solvent; and at least one among a material represented by Formula 1 and a material represented by Formula 2.

Abstract: Provided is a cellulose derivative composition for a secondary battery binder, a method of preparing a composition for a secondary battery electrode, including the same, and a secondary battery including the same. According to the inventive concept, the cellulose derivative composition for a secondary battery binder may include a compound represented by Formula 1 below.

Abstract: Provided is a method of preparing a coating composition for a separator of a secondary battery, and particularly a method including dispersing a first monomer and a surfactant in a solvent to form micelles, adding a first initiator to the solvent and performing first polymerization reaction to form a precursor solution including an emulsion-type binder, and adding a second monomer and a second initiator to the precursor solution and performing second polymerization reaction to form an aqueous binder solution including a solution-type binder, wherein the emulsion-type binder has a core shape, the solution-type binder has a shell shape wrapping the emulsion-type binder, and the emulsion-type binder and the solution-type binder are chemically bonded.

Abstract: Provided is a composite electrode for an all-solid-state secondary battery including a first active material and a second active material, wherein the first active material and the second active material include different materials from each other, and the content of the first active material is 50 vol % to 98 vol % based on the total volume of the first active material and the second active material, the first active material has a volume change rate of 0 vol % to 30 vol % according to volume expansion/contraction during a charging/discharging process, and the second active material has a volume change rate of 35 vol % to 1000 vol % according to volume expansion/contraction during a charging/discharging process.

Abstract: Provided is a method for manufacturing a solid secondary battery, wherein the method includes forming a composite electrolyte film, and forming a positive electrode and a negative electrode respectively on both surfaces of the composite electrolyte film. The forming of a composite electrolyte film includes preparing inorganic ion conductor powder coated with an ion resistance layer, removing the ion resistance layer to expose the surface of the inorganic ion conductor powder, mixing the inorganic ion conductor powder with an organic ion conductor and a solvent to prepare a composite electrolyte solution, and removing the solvent from the composite electrolyte solution.

Abstract: Provided is a method of manufacturing a secondary battery separator including dissolving a polymer binder in water to prepare an aqueous binder solution, dispersing particles in the aqueous binder solution to prepare an aqueous slurry, and preparing a separator substrate, and applying the aqueous slurry on an upper surface and a lower surface of the separator substrate to form an aqueous slurry coating layer, wherein the separator substrate includes a hydrophobic material, the polymer binder is water-soluble, and the aqueous slurry has a viscosity of about 100 cP to about 6000 cP.

Abstract: A lithium battery according to the inventive concept may comprise a cathode, an anode separated from the cathode, a first separator disposed between the cathode and the anode, the first separator having first pores, a second separator disposed on the first separator, the second separator having second pores, and an electrolyte filling a gap between the cathode and the anode. Diameters of the second pores may be smaller than those of the first pores. A standard deviation of the diameters of the second pores is smaller than that of the first pores.

Abstract: Provided is a method for preparing a multi-dopant, oxide-based solid electrolyte. The method comprising preparing a mixture including a lithium (Li) compound, a lanthanum (La) compound, and a metal compound, the metal compound including a first metal element represented by M, adding a first precursor including a second metal element and a second precursor including a third metal element to the mixture, and performing a crystallization operation to form a compound represented by LixLa3M2O12 from the mixture having the first precursor and the second precursor mixed therein, wherein the compound is doped with the second and third metal elements.

Abstract: Provided is a lithium composite anode including a metal film, and lithium ion conductors and electron conductors dispersed on one surface of the metal film, wherein portions of the lithium ion conductors and electron conductors are impregnated into the metal film from the one surface of the metal film.

Abstract: Provided is a method for manufacturing a lithium battery, wherein the method may include preparing a first electrode structure including a first current collector, a first electrode layer, and first electrode columns, which are stacked, preparing a second electrode structure including a second current collector and a second electrode layer, and forming an electrolyte between the first electrode structure and the second electrode structure, the electrolyte may extend in between the first electrode columns, and the forming of the electrolyte may include preparing a mixture including inorganic particles, a polymer, and an organic solution, preparing a liquid-state mixture by heating the mixture, and applying the liquid-state mixture onto the first electrode columns, and the polymer may have nitrile groups.

Abstract: Provided is a solid electrolyte composition including a solid electrolyte with a protective layer provided on a surface thereof, and a polymer binder. The protective layer includes at least one of an inorganic layer, including at least one of an oxide, a nitride, and a sulfide, an organic layer, including a polydopamine derivative, and a self-assembled monolayer, including an organosilane.

Abstract: A lithium battery according to the inventive concept may comprise a cathode, an anode separated from the cathode, a first separator disposed between the cathode and the anode, the first separator having first pores, a second separator disposed on the first separator, the second separator having second pores, and an electrolyte filling a gap between the cathode and the anode. Diameters of the second pores may be smaller than those of the first pores. A standard deviation of the diameters of the second pores is smaller than that of the first pores.

Abstract: A pouch-type flexible film battery, including: (a) a cathode structure including a cathode pouch, a cathode conductive carbon layer, and a cathode layer; (b) an anode structure including an anode pouch, an anode conductive carbon layer, and an anode layer; and (c) a polymer electrolyte layer that is provided between the cathode and anode structures, that is bonded to the cathode layer and to the anode layer, and that is a gel-type electrolyte having adhesive properties and including a cellulose-based polymer.

Abstract: Provided is a lithium battery including a first pouch film, a first anode part on the first pouch film, a second cathode part on the first anode part, a polymer insulating film on the second cathode part, the polymer insulating film including a disk which is configured to penetrate the polymer insulating film, a second anode part on the polymer insulating film, a first cathode part on the second anode part, and a second pouch film on the first cathode part. Herein, the second cathode part is electrically connected to the second anode part through the disk.

Abstract: Provided is a method for preparing an oxide based solid electrolyte, the method comprising preparing a mixture including a lithium (Li) compound, a lanthanum (La) compound, and a metal compound, the metal compound including a first metal element represented by M, adding a first precursor including a second metal element and a second precursor including a third metal element to the mixture, and performing a crystallization operation to form a compound represented by LixLa3M2O12 from the mixture having the first precursor and the second precursor mixed therein, wherein the compound is doped with the second and third metal elements.