Abstract: Provided are an aqueous electrolyte composition including hydrophilic microparticles and a sealed-type primary film battery including an electrolyte layer formed of the aqueous electrolyte composition. In the sealed-type primary film battery, a separation film is interposed between a positive electrode and a negative electrode, and has a plurality of through-holes. A non-flowable electrolyte layer interposed between the positive electrode and the negative electrode includes first and second electrolyte layers extending parallel to the positive electrode and the negative electrode, and a plurality of third electrolyte layers filled in the through-holes of the separation film so as to be integrally connected to the first electrolyte layer and the second electrolyte layer. Due to the third electrolyte layers filled in the through-holes of the separation film, an ion transfer path in the electrolyte layer is shortened.

Abstract: This invention relates to a positive electrode active material for a lithium secondary battery and a lithium secondary battery including the same, and particularly to a positive electrode active material for a lithium secondary battery, in which a lithium composite oxide having a composition of LiNi1-xMxO2 (wherein M represents one or a combination of two elements selected from the group consisting of Co, Al, Mn, Mg, Fe, Cu, Ti, Sn and Cr, and 0.96?x?1.05) is surface-modified using carbon or an organic compound, thereby achieving superior stability and improved high-rate capability compared to conventional positive electrode active materials, and to a lithium secondary battery including the same.

Abstract: Provided is a method of producing a nanoparticle-filled phase inversion polymer electrolyte. The method includes mixing a nanoparticle inorganic filler and a polymer with a solvent to obtain a slurry; casting the obtained slurry to form a membrane; obtaining an inorganic nanoparticle-filled porous polymer membrane by developing internal pores in the cast membrane using a phase inversion method; and impregnating the inorganic nanoparticle-filled porous polymer membrane with an electrolytic solution. The polymer electrolyte produced using the method can be used in a small lithium secondary battery having a high capacity, thereby providing an excellent battery property.

Abstract: There are provided an anode for a lithium metal polymer secondary battery comprising an anodic current collector having a surface on which a plurality of recesses having a predetermined shape are formed and a method of preparing the same. The plurality of recesses are formed on a surface of the anodic current collector using a physical method or a chemical method. In a lithium metal polymer secondary battery employing the anode, oxidation/reduction of lithium and the formation of dendrite occur only in the recesses formed by surface patterning of the anodic current collector. Thus, expanding and shrinking of a battery due to a change in the thickness of the lithium anode can be prevented and cycling stability and the lifespan of a battery can be improved.

Abstract: Provided are a composite polymer electrolyte for a lithium secondary battery in which a composite polymer matrix multi-layer structure composed of a plurality of polymer matrices with different pore sizes is impregnated with an electrolyte solution, and a method of manufacturing the same. Among the polymer matrices, a microporous polymer matrix with a smaller pore size contains a lithium cationic single-ion conducting inorganic filler, thereby enhancing ionic conductivity, the distribution uniformity of the impregnated electrolyte solution, and maintenance characteristics. The microporous polymer matrix containing the lithium cationic single-ion conducting inorganic filler is coated on a surface of a porous polymer matrix to form the composite polymer matrix multi-layer structure, which is then impregnated with the electrolyte solution, to manufacture the composite polymer electrolyte. The composite polymer electrolyte is used in a unit battery.

Abstract: Provided are an aqueous electrolyte composition including hydrophilic microparticles and a sealed-type primary film battery including an electrolyte layer formed of the aqueous electrolyte composition. In the sealed-type primary film battery, a separation film is interposed between a positive electrode and a negative electrode, and has a plurality of through-holes. A non-flowable electrolyte layer interposed between the positive electrode and the negative electrode includes first and second electrolyte layers extending parallel to the positive electrode and the negative electrode, and a plurality of third electrolyte layers filled in the through-holes of the separation film so as to be integrally connected to the first electrolyte layer and the second electrolyte layer. Due to the third electrolyte layers filled in the through-holes of the separation film, an ion transfer path in the electrolyte layer is shortened.

Abstract: Provided are a multi-layered polymer package for a film battery and a combined package and current collector. The polymer package for the film battery and the combined package and current collector include a multi-layered polymer film having a construction of at least three layers, which includes a first polymer film, a second polymer film, and a third polymer film, the first, second, and third polymer films being made of different materials. The first polymer film is made of a hydrocarbon compound which is unsubstituted or substituted by a fluorine (F) atom. The second polymer film is made of an amorphous polymer. The third polymer film is made of a polymer having a tensile strength of a predetermined value or more and a tensile modulus of a predetermined value or more. In the combined package and current collector, a conductive layer is disposed on a surface of the multi-layered polymer film.

Abstract: Provided are an electrolyte composition of a dye-sensitized solar cell, a manufacturing method thereof, and a dye-sensitized solar cell comprising the composition. The composition comprises a polyvinylidene fluoride (PVDF) based high polymer and titanium dioxide nanoparticles serving as an inorganic material based filler. Using the PVDF based high polymer in the composition can solidify the composition, and this solidification can contribute to the flexibility of a solar cell. Also, the inorganic material based filler, i.e., the titanium dioxide nanoparticles, can reinforce the collection and retention of an aqueous component comprising iodide ions, which are carriers within the electrolyte. Accordingly, compared to typical high polymer based electrolyte solutions, excellent photoelectric conversion efficiency can be achieved with the above electrolyte composition.

Abstract: Provided are a composite polymer electrolyte for a lithium secondary battery that includes a composite polymer matrix structure having a single ion conductor-containing polymer matrix to enhance ionic conductivity and a method of manufacturing the same. The composite polymer electrolyte includes a first polymer matrix made of a first porous polymer with a first pore size; a second polymer matrix made of a single ion conductor, an inorganic material, and a second porous polymer with a second pore size smaller than the first pore size. The second polymer matrix is coated on a surface of the first polymer matrix. The composite polymer matrix structure can increase mechanical properties. The single ion conductor-containing porous polymer matrix of a submicro-scale can enhance ionic conductivity and the charge/discharge cycle stability.

Abstract: Provided is a cathode composition for lithium secondary battery that includes a lithium-chromium-titanium-manganese oxide that has the formula Li[Li(1-x)/3CrxTi(2/3)yMn2(1-x-y)/3]O2 where 0?x?0.3, 0?y?0.3 and 0.1?x+y?0.3, and layered a-LiFeO2 structure. A method of synthesizing the lithium-chromium-titanium manganese oxide includes preparing a first mixed solution by dispersing titanium dioxide (TiO2) in a mixed solution of chrome acetate (Cr3(OH)2(CH3CO2)7) and manganese acetate ((CH3CO2)2Mn.4H2O), adding a lithium hydroxide (LiOH) solution to the first mixed solution to obtain homogeneous precipitates, forming precursor powder that has the formula Li[Li(1-x)/3CrxTi(2/3)yMn2(1-x-y)/3]O2 where 0?x?0.3, 0?y?0.3 and 0.1?x+y?0.3 by heating the homogeneous precipitates, and heating the precursor powder to form oxide powder having a layered structure.

Abstract: Provided is a lithium-cobalt-manganese oxide having the formula Li[CoxLi(1/3?x/3)Mn(2/3?2x/3)]O2(0.05<X<0.9) which provide a stable structure and a superior discharge capacity, and the method of synthesizing of the same. The method of synthesizing the oxides according to the present invention comprises: preparing an aqueous solution of lithium salt, cobalt salt, and manganese salt; forming a gel by burning the aqueous solution; making oxide powder by burning the gel; forming a fine oxide powder having a layered structure by the twice of treatments. The lithium-cobalt-manganese oxide synthesized according to the present invention has a stable and superior electrochemical characteristic. The oxide is synthesized by simple and low cost heat treatment process.

Abstract: A cathode active material for a lithium secondary cell used in a cellular phone is disclosed. The cathode active material for the lithium secondary cell and the method the same having a high capacity and a long lifetime, different from LiCoO2 and LiMn2O4, Li(Ni, Co)O2, and V-system oxide that has been researched as the active material for substituting LiCoO2 are provided. The cathode active material for the lithium secondary cell in the next formula 1 is obtained by heating or chemically treating diadochite [Fe2(PO4)(SO4)(OH).6H2O] that is the mineral containing PO43?, SO42?, and OH?. LiaFebMc(PO4)x(SO4)y(OH)z ??(1) In the formula, M is at least one element selected from a radical consisting of Mg, Ti, Cr, Mn, Co, Ni, Cu, Zn, Al, and Si, with 0?a, c?0.5, 1?b?2, 0.5?x, y, z?1.5.

Abstract: A method of preparing layered lithium-chromium-manganese oxides having the formula Li[CrxLi(1/3?x/3) Mn(2/3?2x/3)]O2 where 0.1?X?0.5 for lithium batteries. Homogeneous precipitation is prepared by adding lithium hydroxide (LiOH) solution to a mixed solution of chromium acetate (Cr3(OH)2(CH3CO2)7) and manganese acetate ((CH3CO2)2Mn.4H2O), while precursor powders are prepared by firing the precipitation. After that, the precursor powders are subjected to two heat treatment to yield Li[CrxLi(1/3?x/3) Mn(2/3?2x/3)]O2 with ?-LiFeO2 structure.

Abstract: Provided is a dye-sensitized solar cell including liquid-type imidazolium material, which is liquid at a room temperature to a high temperature, as electrolyte.. The dye-sensitized solar cell includes a semiconductor electrode; a confronting electrode; and electrolyte of 1,3-vinylalkylimidazolium iodide family being inserted between the semiconductor electrode and the confronting electrode. Since the solar cell of the present research uses 1,3-vinylalkylimidazolium iodide instead of iodine-family oxidation and reduction electrolyte including organic solvent easily volatilized at a high temperature. Thus, the solar cell can have excellent thermal stability and temperature stability as well as high energy conversion efficiency.

Abstract: Provided is a lithium-cobalt-manganese oxide having the formula Li[CoxLi(1/3-x/3)Mn(2/3-2x/3)]O2 (0.05<X<0.9) which provide a stable structure and a superior discharge capacity, and the method of synthesizing of the same. The method of synthesizing the oxides according to the present invention comprises: preparing an aqueous solution of lithium salt, cobalt salt, and manganese salt; forming a gel by burning the aqueous solution; making oxide powder by burning the gel; forming a fine oxide powder having a layered structure by the twice of treatments. The lithium-cobalt-manganese oxide synthesized according to the present invention has a stable and superior electrochemical characteristic. The oxide is synthesized by simple and low cost heat treatment process.

Abstract: A composite polymer electrolyte for a lithium secondary battery and a method of manufacturing the same are provided. The composite polymer electrolyte includes a composite film structure which includes a first porous polymer film with good mechanical properties and a second porous polymer film with submicro-scale morphology of more compact porous structure than the first porous polymer structure, coated on a surface of the first porous polymer film, and an electrolyte solution impregnated into the composite film structure. The different morphologies of the composite film structure enable to an increase in mechanical properties and ionic conductivity. Furthermore, the charge/discharge cycle performance and stability of a lithium metal polymer secondary battery are enhanced.

Abstract: Provided are a composite polymer electrolyte for a lithium secondary battery that includes a composite polymer matrix structure having a single ion conductor-containing polymer matrix to enhance ionic conductivity and a method of manufacturing the same. The composite polymer electrolyte includes a first polymer matrix made of a first porous polymer with a first pore size; a second polymer matrix made of a single ion conductor, an inorganic material, and a second porous polymer with a second pore size smaller than the first pore size. The second polymer matrix is coated on a surface of the first polymer matrix. The composite polymer matrix structure can increase mechanical properties. The single ion conductor-containing porous polymer matrix of a submicro-scale can enhance ionic conductivity and the charge/discharge cycle stability.

Abstract: Provided is a method for preparing a Li—Mn—Ni oxide for a lithium secondary battery having a composition of Li[NixLi(1/3-2x/3)Mn(2/3-X/3)O2 (0.05<X<0.6), including the steps of: a] preparing an aqueous solution by resolving lithium salt, manganese salt and nickel salt into distilled water; b) forming gel by heating the aqueous solution; c) preparing oxide powder by burning the gel; d) performing a first thermal treatment on the oxide powder, and grinding the resultant; and e) performing a second thermal treatment on the resultant powder, and grinding the resultant. The technology of the present invention can prepare a Li—Mn—Ni oxide having a composition of Li[NixLi(1/3-2x/3)Mn(2/3-x/3)O2 (0.05<X<0.6) to be used as a cathode material of a lithium secondary battery having a stable and excellent electrochemical characteristics.

Abstract: A method of preparing layered lithium-chromium-manganese oxides having the formula Li[CrxLi(1/3-x/3) Mn(2/3-2x/3)]O2 where 0.1≦X≦0.5 for lithium batteries. Homogeneous precipitation is prepared by adding lithium hydroxide (LiOH) solution to a mixed solution of chromium acetate (Cr3(OH)2(CH3CO2)7) and manganese acetate ((CH3CO2)2Mn.4H2O), while precursor powders are prepared by firing the precipitation. After that, the precursor powders are subjected to two heat treatment to yield Li[CrxLi(1/3-x/3) Mn(2/3-2x/3)]O2 with &agr;-LiFeO2 structure.

Abstract: Provided are a composite polymer electrolyte for a lithium secondary battery in which a composite polymer matrix multi-layer structure composed of a plurality of polymer matrices with different pore sizes is impregnated with an electrolyte solution, and a method of manufacturing the same. Among the polymer matrices, a microporous polymer matrix with a smaller pore size contains a lithium cationic single-ion conducting inorganic filler, thereby enhancing ionic conductivity, the distribution uniformity of the impregnated electrolyte solution, and maintenance characteristics. The microporous polymer matrix containing the lithium cationic single-ion conducting inorganic filler is coated on a surface of a porous polymer matrix to form the composite polymer matrix multi-layer structure, which is then impregnated with the electrolyte solution, to manufacture the composite polymer electrolyte. The composite polymer electrolyte is used in a unit battery.