Abstract: The present disclosure relates to an all-solid lithium secondary battery and a preparation method thereof, wherein the all-solid lithium secondary battery includes a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer, wherein the negative electrode active material layer includes a carbon structure and silver nanoparticles, the carbon structure includes a structure in which a plurality of graphene sheets are connected to each other, and the plurality of graphene sheets include two or more graphene sheets having different plane directions.

Abstract: The present disclosure relates to an all-solid lithium secondary battery and a preparation method thereof, wherein the all-solid lithium secondary battery includes a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer, wherein the negative electrode active material layer includes a carbon structure and silver nanoparticles, the carbon structure includes at least one hollow-type particle, and the hollow-type particle includes a hollow and a carbonaceous shell surrounding the hollow.

Abstract: An all-solid lithium secondary battery and a preparation method thereof are proved. The all-solid lithium secondary battery comprises a positive electrode active material layer, a negative electrode active material layer including graphitized platelet carbon nanofibers and silver nanoparticles, and a solid electrolyte layer between the positive electrode active material layer and the negative electrode active material layer.

Abstract: A negative electrode for all-solid-state battery and a lithium secondary battery including the same are provided. The negative electrode includes a negative electrode current collector formed of an electrically conductive metal material, a coating layer formed on one surface or opposite surfaces of the negative electrode current collector, the coating layer including a lithiophilic material, and an ion transport layer formed on the coating layer, the ion transport layer including amorphous carbon configured to allow lithium ions to move therethrough.

Abstract: A method for manufacturing a solid-state battery, the method preventing a reaction between lithium metal in a negative electrode and a sulfide-based solid electrolyte material in a solid electrolyte membrane during a pressurization process for binding electrode members with each other, and the method providing a solid-state battery which has low porosity in a positive electrode and the solid electrolyte membrane and reduced generation of a short-circuit, and the method providing an improved battery production yield.

Abstract: Disclosed is a lithium metal secondary battery including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a protective layer interposed between the negative electrode and the separator. The protective layer comprises an additive, and wherein the additive comprises a mixture of hexagonal boron nitride (BN) flakes and an ionomer comprising a sulfur (S)-containing anionic group and fluorine (F). The sulfur (S)-containing anionic group is at least one selected from the group consisting of SO42? and SO3?.

Abstract: Disclosed is a method for manufacturing a lithium metal secondary battery including a lithium metal electrode as a negative electrode, wherein the lithium metal electrode has a protective layer formed thereon, and the lithium metal secondary battery is discharged before its initial charge during an activation step of the lithium metal secondary battery so that stripping occurs on the surface of the lithium metal electrode.

Abstract: A solid-state battery comprising a positive electrode, a negative electrode, and a solid electrolyte membrane between the positive electrode and the negative electrode, the solid electrolyte membrane including a first solid electrolyte layer and a second solid electrolyte layer, is provided. The first solid electrolyte layer faces the positive electrode and includes a first sulfide-based solid electrolyte, and the second solid electrolyte layer includes a second sulfide-based solid electrolyte having an average particle diameter (D50) larger than an average particle diameter (D50) of the first sulfide-based solid electrolyte.

Abstract: The present invention relates to a device and method which can measure, in real time, the resistance, depending on pressure changes, of a separator that is immersed in an electrolyte, and enables analysis of the resistance properties of a separator reflecting the real operating state of a secondary battery.

Abstract: The present disclosure relates to an all-solid-state battery including a thin film current collector and a method of manufacturing the same, and more particularly to a current collector having a thickness of less than 5 µm, which is thermally treated together with a solid electrolyte, whereby interfacial resistance between the current collector and the solid electrolyte is reduced, and therefore the overall size of the all-solid-state battery is reduced.

Abstract: Disclosed is a method for manufacturing a lithium metal secondary battery including a lithium metal electrode as a negative electrode, wherein the lithium metal electrode has a protective layer formed thereon, and the lithium metal secondary battery is discharged before its initial charge during an activation step of the lithium metal secondary battery so that stripping occurs on the surface of the lithium metal electrode.

Abstract: The present disclosure relates to an oxide-based solid electrolyte for low-temperature sintering process and a method of manufacturing the same, and more particularly to a low-temperature sintering process having no problem of side reaction between a positive electrode active material and an oxide-based solid electrolyte through use of a low-melting point dissimilar oxide and a method of manufacturing an all-solid-state battery including a positive electrode manufactured thereby.

Abstract: The present disclosure relates to a solid state battery comprising silicon (Si) as a negative electrode active material. The solid state battery according to the present disclosure does not comprise a conductive material and a solid electrolyte in the negative electrode and comprise a minimum amount of binder. According to this structural feature, the battery according to the present disclosure has good electrical and chemical properties including heat resistant stability, energy density, life characteristics and Coulombic efficiency.

Abstract: A solid state battery is described, which has a negative electrode having a negative electrode active material layer including silicon (Si) as a negative electrode active material. The Si may be present as particles, e.g., microparticles, having an average particle size (D50) of 0.1 ?m to 10 ?m. The negative electrode active material layer may include the silicon (Si) in an amount of 75 wt % or more, 95 wt % or more, 99 wt % or more, or 99.9 wt % or more, based on 100 wt % of the negative electrode active material layer. The negative electrode active material layer can be free or substantially free of conductive material, carbon, solid state electrolyte, and/or binder. Preferably, after charge/discharge cycles, the negative electrode active material layer forms densified and interconnected large particles of Li—Si alloy, e.g., the Li—Si alloy may have at least one columnar structure and at least one void.

Abstract: A lithium metal secondary battery including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a protective layer interposed between the negative electrode and the separator. The protective layer includes an additive, wherein the additive comprises a mixture of hexagonal boron nitride (BN) flakes with an ionomer having a sulfur (S)-containing anionic group and fluorine (F).

Abstract: Disclosed is a method of manufacturing a lithium metal unit cell for sulfide-based all-solid-state batteries and a unit cell manufactured using the same, and more particularly to a method of manufacturing a lithium metal unit cell for sulfide-based all-solid-state batteries wherein pressing is performed using cold isostatic pressing at higher than 100 MPa to lower than 470 MPa irrespective of time or pressing is performed at 470 MPa for 1 minute in order to reduce interface resistance of a sulfide-based all-solid-state battery using a lithium metal as a negative electrode and a unit cell manufactured using the same.

Abstract: The present invention relates to a device and method which can measure, in real time, the resistance, depending on pressure changes, of a separator that is immersed in an electrolyte, and enables analysis of the resistance properties of a separator reflecting the real operating state of a secondary battery.

Abstract: A lithium metal secondary battery including: an electrode assembly including a positive electrode, a lithium metal negative electrode, a separator interposed between the positive electrode and the lithium metal negative electrode, a protective layer interposed between the lithium metal negative electrode and the separator; and a non-aqueous electrolyte injected to the electrode assembly, wherein the protective layer includes a polymer having a sulfur chain group. A battery module including the lithium metal secondary battery is also disclosed.

Abstract: An electrode includes an electrode active material layer, the electrode active material layer including an electrode active material and a conductive agent, the conductive agent including: a point-type conductive agent; and a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded to each other, wherein the carbon nanotube structure has an average length of 1 ?m to 500 ?m, and the carbon nanotube structure is contained in the electrode active material layer in an amount of 0.01 wt % to 5.0 wt %. A secondary battery including the electrode is also provided.

Abstract: A lithium metal secondary battery including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a protective layer interposed between the negative electrode and the separator. The protective layer includes an additive, wherein the additive comprises a mixture of hexagonal boron nitride (BN) flakes with an ionomer having a sulfur (S)-containing anionic group and fluorine (F).