Abstract: Disclosed are a precursor of an electrode active material for a lithium secondary battery, in which a metal material ionizable through electrolytic decomposition is uniformly coated on a surface of a primary precursor formed of a transition metal hydrate, and a method of preparing the same.

Abstract: The present invention provides a positive electrode active material for a lithium secondary battery which is capable of preventing the degeneration of a positive electrode active material and the generation of a gas during operating a battery due to humidity, by including a surface treatment layer of an amorphous glass including an alkali metal oxide and an alkaline earth metal oxide on the surface of a core including a lithium composite metal oxide and by decreasing humidity reactivity, and a secondary battery including the same.

Abstract: The present invention relates to a positive electrode active material for a secondary battery, which comprises a core including a lithium composite metal oxide, and a surface treatment layer located on a surface of the core and including an amorphous oxide, wherein the amorphous oxide including silicon (Si), nitrogen (N) and at least one metal element selected from the group consisting of a Group 1A element, a Group 2A element, and a Group 3B element, and a method for preparing the same.

Abstract: The present invention relates to a method for recovering a positive electrode active material from a lithium secondary battery including: 1) separating a positive electrode into a collector and a positive electrode part; 2) removing an organic substance by firing the separated positive electrode part; 3) washing the fired resultant and removing remaining fluorine (F); 4) adding a lithium-containing material into the washed resultant and firing to recover a lithium transition metal oxide.

Abstract: Disclosed are a cathode active material and a lithium secondary battery including the same, and a method of manufacturing the cathode active material, the method including: (a) manufacturing a lithium metal oxide according to formula 1 below: Li1+zNiaMnbCo1?(a+b)O2??(1) wherein 0?z?0.1, 0.1?a?0.8, 0.1?b?0.8 and a+b<1; (b) dry mixing the lithium metal oxide, and a precursor including zirconium and fluorine; and (c) changing the precursor including zirconium and fluorine into ZrO2 and substituting some of oxygen (O) anions with F by heat-treatment after dry mixing of step (b), wherein the cathode active material is coated with ZrO2 and F.

Abstract: The present invention provides a positive electrode active material for a lithium secondary battery which is capable of preventing the degeneration of a positive electrode active material and the generation of a gas during operating a battery due to humidity, by including a surface treatment layer of an amorphous glass including an alkali metal oxide and an alkaline earth metal oxide on the surface of a core including a lithium composite metal oxide and by decreasing humidity reactivity, and a secondary battery including the same.

Abstract: The present invention provides a method for treating the particle surface of a cathode active material for a lithium secondary battery, the method comprising (a) preparing a cathode active material having a lithium compound; (b) generating a plasma from a gas comprising at least one of a fluorine-containing gas and a phosphorus-containing gas as a part of a reactive gas; and (c) removing lithium impurities present on the particle surface of the cathode active material with the plasma. In accordance with the present invention, the amount of the lithium impurities present on the particle surface of the cathode active material can be reduced to suppress a side reaction of the lithium impurities and an electrolyte.

Abstract: A positive electrode active material for a secondary battery and a secondary battery including the same are provided. The positive electrode active material for a secondary battery includes on the surface of a core, a surface treatment layer composed of a B and Si-containing amorphous oxide, and thus may exhibit reduced moisture reactivity, improved thermal and chemical stability, and high-voltage stability.

Abstract: A check valve driving device for injecting gas, which enables an accurate operation of a check valve for injecting gas and long-term usage by enhancing durability, comprises: an upper portion fixing block which moves vertically by coupling onto a yoke repeating vertical movements; a lower portion fixing block which is coupled to a prechamber at a lower portion of the yoke; a roller which is rotatably coupled onto the upper portion fixing block, and of which a center portion diameter is bigger than diameters of both end portions; a guide, which is rotatably coupled onto the lower portion fixing block, for rotating when a curved surface on one side thereof comes into contact with the roller moving vertically; an operation piece, which is rotatably coupled onto the lower portion fixing block, wherein a front end of the operation piece moves vertically in accordance with the rotation of the guide; and a pressing rod which is coupled to the front end of the operation piece, and which is lowered in accordance with

Abstract: A passive cooling system of a nuclear power plant includes a steam generator, a cooling water storage tank, a water cooling heat exchanger, an air cooling heat exchanger, a divergence valve, and a cooling tower. The steam generator generates steam by heat exchange with a primary coolant system, and the cooling water storage tank stores cooling water therein. The water cooling heat exchanger is disposed in the cooling water storage tank, and the air cooling heat exchanger is connected to the steam generator. The divergence valve is controllable to divert steam from the steam generator into both the water cooling heat exchanger and the air cooling heat exchanger. Each of the cooling water storage tank, the water cooling heat exchanger, and the air cooling heat exchanger are located in the cooling tower.

Abstract: A check vale for injecting fuel comprises: an integrally formed body provided with a neck-down portion having a diameter smaller than other areas on an outer surface of an upper portion of a fuel flow hole; an integrally formed spindle perpendicularly penetrating the body and provided with a neck-down portion having a diameter smaller than other areas on an outer surface of a lower portion of the fuel flow hole of the body; a spring surrounding an upper end portion of the spindle; a spring seat for fixing the spring surrounding the upper end portion of the spindle and for guiding the spindle to a perpendicular position; a coupling ring coupled to an upper end of the body for fixing the body to a prechamber; and a spacer coupled to a lower end of the body for fixing the lower end of the body that covers an outer edge of the spindle to the prechamber.

Abstract: Disclosed are a cathode active material and a lithium secondary battery including the same, and a method of manufacturing the cathode active material, the method including: (a) manufacturing a lithium metal oxide according to formula 1 below: Li1+zNiaMnbCo1?(a+b)O2 ??(1) wherein 0?z?0.1, 0.1?a?0.8, 0.1?b?0.8 and a+b<1; (b) dry mixing the lithium metal oxide, and a precursor including zirconium and fluorine; and (c) changing the precursor including zirconium and fluorine into ZrO2 and substituting some of oxygen (O) anions with F by heat-treatment after dry mixing of step (b), wherein the cathode active material is coated with ZrO2 and F.

Abstract: Disclosed herein is a precombustion chamber structure for a gas engine. The precombustion chamber structure is configured to facilitate disassembly of a precombustion chamber tip, thus making maintenance, repair or inspection of the precombustion chamber easy. For this, the precombustion chamber structure includes: a body (110) having a main body (111), a water jacket (112) and a precombustion chamber tip (113); and a spark plug (120) for igniting fuel gas injected into the precombustion chamber (114) formed in the body (110). The precombustion chamber structure ignites fuel gas and supplies the ignited fuel gas into a main combustion chamber. A tool insert groove (1131) is formed in the junction between the precombustion chamber tip and the water jacket. The tool insert groove (1131) allows a tool for disassembly to be inserted into a space between the precombustion chamber tip and the water jacket.

Abstract: Disclosed are a precursor of an electrode active material for a lithium secondary battery, in which a metal material ionizable through electrolytic decomposition is uniformly coated on a surface of a primary precursor formed of a transition metal hydrate, and a method of preparing the same.

Abstract: A check valve driving device for injecting gas, which enables an accurate operation of a check valve for injecting gas and long-term usage by enhancing durability, comprises: an upper portion fixing block which moves vertically by coupling onto a yoke repeating vertical movements; a lower portion fixing block which is coupled to a prechamber at a lower portion of the yoke; a roller which is rotatably coupled onto the upper portion fixing block, and of which a center portion diameter is bigger than diameters of both end portions; a guide, which is rotatably coupled onto the lower portion fixing block, for rotating when a curved surface on one side thereof comes into contact with the roller moving vertically; an operation piece, which is rotatably coupled onto the lower portion fixing block, wherein a front end of the operation piece moves vertically in accordance with the rotation of the guide; and a pressing rod which is coupled to the front end of the operation piece, and which is lowered in accordance with

Abstract: A check vale for injecting gas comprises: an integrally formed body provided with a corrugated portion having a diameter smaller than other areas on an outer surface of an upper portion of a gas flow hole; an integrally formed spindle perpendicularly penetrating the body and provided with a corrugated portion having a diameter smaller than other areas on an outer surface of a lower portion of the gas flow hole of the body; a spring penetrating an upper end portion of the spindle; a spring seat for fixing the spring penetrating the upper end portion of the spindle and for guiding the spindle to a perpendicular position; a coupling ring coupled to an upper end of the body for fixing the body to a prechamber; and a spacer coupled to a lower end of the body for fixing the lower end of the body that covers an outer edge of the spindle to the prechamber.

Abstract: Disclosed herein is a precombustion chamber structure for a gas engine. The precombustion chamber structure is configured to facilitate disassembly of a precombustion chamber tip, thus making maintenance, repair or inspection of the precombustion chamber easy. For this, the precombustion chamber structure includes: a body (110) having a main body (111), a water jacket (112) and a precombustion chamber tip (113); and a spark plug (120) for igniting fuel gas injected into the precombustion chamber (114) formed in the body (110). The precombustion chamber structure ignites fuel gas and supplies the ignited fuel gas into a main combustion chamber. A tool insert groove (1131) is formed in the junction between the precombustion chamber tip and the water jacket. The tool insert groove (1131) allows a tool for disassembly to be inserted into a space between the precombustion chamber tip and the water jacket.

Abstract: The present invention provides a method for treating the particle surface of a cathode active material for a lithium secondary battery, the method comprising (a) preparing a cathode active material having a lithium compound; (b) generating a plasma from a gas comprising at least one of a fluorine-containing gas and a phosphorus-containing gas as a part of a reactive gas; and (c) removing lithium impurities present on the particle surface of the cathode active material with the plasma. In accordance with the present invention, the amount of the lithium impurities present on the particle surface of the cathode active material can be reduced to suppress a side reaction of the lithium impurities and an electrolyte.

Abstract: A method of manufacturing a unit cell of a solid oxide fuel cell using a decalcomania process, in which an anode, electrolyte, cathode and interconnect are deposited on a substrate using the decalcomania process when the unit cell of the solid oxide fuel cell having a variety of shapes, such as a planar type, a horizontal pipe type, a tubular type, a segmented type, and the like, is manufactured.