Abstract: A polyoxymethylene-based all-solid-state polymer electrolyte prepared by in-situ ring-opening polymerization is used in forming an all-solid-state secondary lithium battery. A trioxymethylene monomer, an additive and lithium salt initiates in-situ ring-opening polymerization on a porous support material through a catalyst to form the all-solid-state polymer electrolyte, which has a thickness of 10 ?m-800 ?m, an ionic conductivity of 4×10?5 S/cm?8×10?3 S/cm at room temperature and an electrochemical window not lower than 4.2 V.

Abstract: An exemplary embodiment of the present invention provides a spiral-wound electrode assembly including: a negative electrode and a positive electrode, each of which is configured to include a substrate, and a first composite material and a second composite material formed on opposite surfaces of the substrate; and a separator disposed between the negative electrode and the anode, wherein the first composite material of the negative electrode is disposed farther away from a center of the electrode assembly than the second composite material of the negative electrode, and the first composite material of the negative electrode is oriented with respect to a first surface of the substrate of the negative electrode.

Abstract: The present invention relates to a positive electrode material comprising a core material and a coating layer coated on the surface of the core material, the core material comprises nickel hydroxide, and the coating layer comprises a tetravalent cobalt compound; and based on the weight of the coating layer, the content of the tetravalent cobalt compound is no less than 45 wt %. The present invention also relates to a preparation method for the positive electrode material. The present invention further relates to an alkaline secondary battery containing the positive electrode material.

Abstract: Provided is a power storage element including: an outer collector including outer opposing walls facing each other with a gap therebetween in an opposition direction, an inner collector including inner opposing walls, and an electrode member disposed in a space defined between the opposing walls. The electrode member includes: an electrode laminate having a sheet-like shape and including a positive electrode body, a negative electrode body, and a separator interposed between the positive and negative electrode bodies. The electrode laminate forms a plurality of unit electrode layers laminated in a lamination direction perpendicular to the opposition direction, and adjacent unit electrode layers in the lamination direction are continued in a bending manner at end portions of the unit electrode layers in an extension direction. The positive electrode body and the negative electrode body are in contact with a first collector and a second collector, respectively, to be electrically connected thereto.

Abstract: An electrolyte solution additive, a non-aqueous electrolyte solution including the same, and a lithium secondary battery including the same are disclosed herein. In some embodiments, an electrolyte solution additive is represented by Formula 1 wherein, in Formula 1, R is a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms.

Abstract: An anode active material for a lithium secondary battery according to an embodiment of the present invention includes a first anode active material and a second anode active material, each of which includes a carbon-based active material and has a crystallite size in a range from 50 nm to 60 nm. An XRD orientation ratio of the first anode active material is in a range from 0.9 to 1.2, and an XRD orientation ratio of the second anode active material is in a range from 1 to 5. High-temperature storage and life-span properties are improved while maintaining high capacity using the combination of the first and second anode active materials.

Abstract: A slurry is prepared by mixing active material particles, capsule-shaped particles, a binder, and an organic solvent. The slurry is applied to a surface of a substrate to form a coating film. The coating film is heated to dry to form an active material layer. The active material layer is compressed to produce an electrode. Each of the capsule-shaped particles includes a thermoplastic resin. The thermoplastic resin softens when heated in the presence of the organic solvent. When the thermoplastic resin softens, the capsule-shaped particles shrink to form voids in the active material layer.

Abstract: Presented are electrochemical devices with in-stack reference electrodes, methods for making/using such devices, and battery cells with stacked electrodes segregated by electrode separator assemblies including thermal barriers and built-in reference electrodes. An electrochemical device, such as a lithium-class secondary battery cell, includes an insulated and sealed housing with an ion-conducting electrolyte located inside the housing. A stack of working electrodes is also located inside the device housing, in electrochemical contact with the electrolyte. At least one electrode separator assembly is located inside the device housing, interposed between a neighboring pair of (anode and cathode) working electrodes. The electrode separator assembly includes a separator layer fabricated with an electrically insulating material that is sufficiently porous to transmit therethrough the ions of the electrolyte.

Abstract: An electrode assembly includes a positive electrode member including a positive electrode current collector and a positive electrode active material coating layer formed on the positive electrode current collector; and a negative electrode member including a negative electrode current collector and a negative active material coating layer formed on the negative electrode current collector, wherein the positive electrode current collector comprises a disk-shaped positive electrode disk part, and a cylindrical-shaped positive electrode cylinder part extended from one surface of the positive electrode disk part, wherein the negative electrode current collector comprises a disk-shaped negative electrode disk part, and a cylindrical-shaped negative electrode cylinder part extended from one surface of the negative electrode disk part, and wherein the positive electrode member and the negative electrode member are assembled so that the positive electrode cylinder part and the negative electrode cylinder part are adj