Abstract: The method for manufacturing a solid electrolyte using an LLZ material for a lithium-ion battery comprises the steps of: providing a starting material in which lanthanum nitrate [La(NO3)3.6H2O] and zirconium nitrate [ZrO(NO3)2.6H2O] are mixed at a mole ratio of 3:2; forming an aqueous solution by dissolving the starting material; forming a precipitate by putting ammonia, which is a complex agent, and sodium hydroxide, which adjusts the pH of a reactor, into the aqueous solution, mixing the same, and then co-precipitating the mixture; forming a primary precursor powder by cleaning, drying and pulverizing the precipitate; forming a secondary precursor powder by mixing lithium powder [LiOH.H2O] with the primary precursor powder and ball-milling the mixture so as to solidify the lithium; and forming a solid electrolyte powder by heat-treating the secondary precursor powder.

Abstract: The present invention relates to an all-solid-state lithium secondary battery and a method of manufacturing the same. The all-solid-state lithium secondary battery includes a cathode, an anode, and a composite solid electrolyte layer between the cathode and the anode, wherein first and second LLZOs contained respectively in the cathode and the composite solid electrolyte layer are each independently aluminum-doped or undoped LLZO, and the battery of the invention can exhibit improved discharge capacity and cycle characteristics because both the cathode and the composite solid electrolyte layer contain a conductive polymer, a lithium salt and an inorganic ceramic solid electrolyte.

Abstract: Disclosed is a method of preparing a solid electrolyte, which includes (a) preparing a solid electrolyte precursor slurry by subjecting a mixed solution including a metal precursor solution, containing a lanthanum precursor, a zirconium precursor and an aluminum precursor, a complexing agent, and a pH controller to coprecipitation, (b) preparing a solid electrolyte precursor by washing and drying the solid electrolyte precursor slurry, (c) preparing a mixture by mixing the solid electrolyte precursor with a lithium source, and (d) preparing an aluminum-doped lithium lanthanum zirconium oxide (LLZO) solid electrolyte by calcining the mixture, and which is also capable of adjusting the aluminum content of a starting material to thus control sintering properties and of adjusting the composition of a precursor and a lithium source to thus control the crystal structure, thereby improving the ionic conductivity of the solid electrolyte.

Abstract: The method for manufacturing a solid electrolyte using an LLZ material for a lithium-ion battery comprises the steps of: providing a starting material in which lanthanum nitrate [La(NO3)3.6H2O] and zirconium nitrate [ZrO(NO3)2.6H2O] are mixed at a mole ratio of 3:2; forming an aqueous solution by dissolving the starting material; forming a precipitate by putting ammonia, which is a complex agent, and sodium hydroxide, which adjusts the pH of a reactor, into the aqueous solution, mixing the same, and then co-precipitating the mixture; forming a primary precursor powder by cleaning, drying and pulverizing the precipitate; forming a secondary precursor powder by mixing lithium powder [LiOH.H2O] with the primary precursor powder and ball-milling the mixture so as to solidify the lithium; and forming a solid electrolyte powder by heat-treating the secondary precursor powder.

Abstract: The present invention relates to an all-solid-state lithium secondary battery and a method of manufacturing the same. The all-solid-state lithium secondary battery includes a cathode, an anode, and a composite solid electrolyte layer between the cathode and the anode, wherein first and second LLZOs contained respectively in the cathode and the composite solid electrolyte layer are each independently aluminum-doped or undoped LLZO, and the battery of the invention can exhibit improved discharge capacity and cycle characteristics because both the cathode and the composite solid electrolyte layer contain a conductive polymer, a lithium salt and an inorganic ceramic solid electrolyte.

Abstract: Disclosed is a method of preparing a solid electrolyte, which includes (a) preparing a solid electrolyte precursor slurry by subjecting a mixed solution including a metal precursor solution, containing a lanthanum precursor, a zirconium precursor and an aluminum precursor, a complexing agent, and a pH controller to coprecipitation, (b) preparing a solid electrolyte precursor by washing and drying the solid electrolyte precursor slurry, (c) preparing a mixture by mixing the solid electrolyte precursor with a lithium source, and (d) preparing an aluminum-doped lithium lanthanum zirconium oxide (LLZO) solid electrolyte by calcining the mixture, and which is also capable of adjusting the aluminum content of a starting material to thus control sintering properties and of adjusting the composition of a precursor and a lithium source to thus control the crystal structure, thereby improving the ionic conductivity of the solid electrolyte.

Abstract: This disclosure synthesizes an anodic composite material Li(LixNiyCozMnwO2+?) of Li2MnO3 series whose theoretical capacity is a level of about 460 mAh/g, and to produce an electrode of a high capacity using the synthesized anodic composite material. Also provided is a method for charging and discharging the electrode. Here, the method for producing an anodic composite material for a lithium secondary battery includes the steps of: mixing a nickel nitrate solution, a manganese nitrate solution, and a cobalt nitrate solution to produce a starting material solution; and mixing the starting material solution with a complexing agent so as to produce an anodic composite material Li(LixNiyCozMnwO2+?) of Li2MnO3 series by means of coprecipitation.

Abstract: The method for manufacturing a solid electrolyte using an LLZ material for a lithium-ion battery comprises the steps of: providing a starting material in which lanthanum nitrate [La(NO3)3.6H2O] and zirconium nitrate [ZrO(NO3)2.6H2O] are mixed at a mole ratio of 3:2; forming an aqueous solution by dissolving the starting material; forming a precipitate by putting ammonia, which is a complex agent, and sodium hydroxide, which adjusts the pH of a reactor, into the aqueous solution, mixing the same, and then co-precipitating the mixture; forming a primary precursor powder by cleaning, drying and pulverizing the precipitate; forming a secondary precursor powder by mixing lithium powder [LiOH.H2O] with the primary precursor powder and ball-milling the mixture so as to solidify the lithium; and forming a solid electrolyte powder by heat-treating the secondary precursor powder.

Abstract: The present invention relates to the manufacture of a high capacity electrode by synthesizing an excellent Li2MnO3-based composite material Li(LixNiyCozMnwO2) to improve the characteristics of an inactive Li2MnO3 material with a specific capacity of about 460 mAh/g. Here, a manufacturing method of a cathode material for a lithium secondary battery uses a Li2MnO3-based composite material Li(LixNiyCozMnwO2) by reacting a starting material wherein a nickel nitrate solution, a manganese nitrate solution and a cobalt nitrate solution are mixed, with a complex agent by co-precipitation.

Abstract: This disclosure synthesizes an anodic composite material Li(LixNiyCozMnwO2+?) of Li2MnO3 series whose theoretical capacity is a level of about 460 mAh/g, and to produce an electrode of a high capacity using the synthesized anodic composite material. Also provided is a method for charging and discharging the electrode. Here, the method for producing an anodic composite material for a lithium secondary battery includes the steps of: mixing a nickel nitrate solution, a manganese nitrate solution, and a cobalt nitrate solution to produce a starting material solution; and mixing the starting material solution with a complexing agent so as to produce an anodic composite material Li(LixNiyCozMnwO2+?) of Li2MnO3 series by means of coprecipitation.

Abstract: The present invention relates to the manufacture of a high capacity electrode by synthesizing an excellent Li2MnO3-based composite material Li(LixNiyCozMnwO2) to improve the characteristics of an inactive Li2MnO3 material with a specific capacity of about 460 mAh/g. Here, a manufacturing method of a cathode material for a lithium secondary battery uses a Li2MnO3-based composite material Li(LixNiyCozMnwO2) by reacting a starting material wherein a nickel nitrate solution, a manganese nitrate solution and a cobalt nitrate solution are mixed, with a complex agent by co-precipitation.

Abstract: The present invention relates to a method for manufacturing unit cells of a solid oxide fuel cell through a process of attaching a fuel electrode reaction layer/electrolyte layer film assembly, manufactured using a tape casting method, onto a fuel electrode support (sintered body) which consists of the unit cells of the solid oxide fuel cell and which is manufactured using a tape casting method, a pressure method, a discharge plasma method, or the like.

Abstract: A manufacturing method for a solid oxide fuel cell (SOFC) unit cell is disclosed. The manufacturing method may include manufacturing an Ni—CeScSZ anode layer; manufacturing a CeScSZ electrolyte layer; manufacturing a gadolinia-doped ceria (GDC) buffer layer; and manufacturing a lanthanum strontium cobalt ferrite (LSCF) cathode layer. Accordingly, an ohmic resistance of electrolyte and a polarization resistance may be reduced and high output may be obtained even at a middle low temperature.

Abstract: A photocatalyst for the preparation of hydrogen consisting of a catalytically active ingredient, cesium (Cs), impregnated in a support, K.sub.4 Nb.sub.6 O.sub.17, represented by Formula I as follows:Cs (a) /K.sub.4 Nb.sub.6 O.sub.17wherein a is an amount of the catalytically active ingredient impregnated in the support and has a value of between 0.05 to 5.0% by weight based on total weight of the support. Such a catalyst is prepared by combining K.sub.2 CO.sub.3 with Nb.sub.2 O.sub.5 in a mole ratio of 2:3; sintering the combination at a temperature of about 1,200.degree.-1,300.degree. C. to produce the support, K.sub.4 Nb.sub.6 O.sub.17 ; and impregnating the support with the catalytically active ingredient, Cs. Hydrogen is efficiently produced by illuminating an ultraviolet light on an aqueous solution added with an oxygen-containing organic promoter at a reaction temperature of about 15.degree.-80.degree. C., under a reaction pressure of about 0.1-3.0 atm, in the presence of the photocatalyst.