Abstract: The present invention relates to a method of preparing a lithium ion polymer battery which has a high capacity and a good cyclability as well as no exudation of liquid electrolyte. The lithium ion polymer battery according to the present invention is prepared by the steps of forming electrode films, laminating the electrode films on both surfaces of a grid or extended metal so as to improve the interfacial adhesion between the electrode films, forming a polymer electrolyte film composed of a polymer, an electrolyte solution, and a filler, and laminating the composite anode, the polymer electrolyte and the composite cathode. The activated composite anode/polymer electrolyte film/activated composite cathode is laminated to obtain a lithium ion polymer battery structure. The lithium ion polymer battery is vacuum-packaged using a vacuum packaging apparatus.

Abstract: A gel polymer electrolyte according to the present invention comprises a polymer selected from the group consisting of vinyl acetate copolymer, poly(ethylene/vinylacetate/carbon oxide: EVACM), and poly(ethylene/vinylacetate/maleic acid anhydride: EVAMA); an inorganic filler; and a liquid electrolyte that a lithium salt is dissolved in an aprotic solvent. It is preferable that the polymer material in a gel polymer electrolyte according to the present invention is in the range of 20 to 30% by weight, the inorganic material filler is in the range of 5 to 20% by weight, and the liquid electrolyte is in the range of 60 to 80 % by weight. As a specific functional group which has a high compatibility with a liquid electrolyte in the present invention is contained in the polymer material, a lithium ion becomes to move with ease in electrolyte, and the ionic conductivity is over 0.5 mS/cm which is the demand level of a gel polymer electrolyte.

Abstract: The Li.sub.x Mn.sub.2 O.sub.4 powder for cathode active material of a lithium secondary battery of the present invention is prepared by a method of comprising the steps of mixing an acetate aqueous solution using Li acetate and Mn acetate as metal precursors, and a chelating agent aqueous solution using PVB, GA, PAA or GC as a chelating agent; heating the mixed solution at 70.about.90.degree. C. to form a sol; further heating the sol at 70.about.90.degree. C. to form a gel precursor; calcining the produced gel precursor at 200 .about.900.degree. C. for 5.about.30 hours under atmosphere. The cathode active material, Li.sub.x Mn.sub.2 O.sub.4 powder for a lithium secondary battery in accordance with the present invention has a uniform particle size distribution, a high crystallinity and a pure spinel-phase, and a particle size, a specific surface area, a lattice of a cubic structure and the like can be controlled upon the preparing conditions. The present invention also provides a method of preparing LiNi.sub.

Abstract: A solid polymer electrolyte according to the present invention comprises a polymer (A), and a liquid electrolyte (B) composed of a lithium salt and an aprotic solvent, optionally and a ceramic filler (C). The polymer (A) is poly(acrylonitrile-methyl methacrylate), poly(acrylonitrile-methyl methacrylate-oligooxyethylene ethylether methacrylate) or poly(acrylonitrilc-methyl methacrylate-styrene). The polymer (A) is poly(acrylonitrile methyl methacrylate) containing acrylonitrile of 10.about.90 mol %, preferably 26.about.46 mol %, poly(acrylonitrile-methyl methacrylate-oligooxyethylene ethylether methacrylate) containing acrylonitrile of 20.about.80 mol %, methyl methacrylate of 20.about.80 mol % and oligooxyethylene ethylether methacrylate of 5.about.20 mol %, and poly(acrylonitrile-methyl methacrylate-styrene) containing acrylonitrile of 10.about.80 mol %, methyl methacrylate of 10.about.60 mol % and styrene of 5.about.50 mol %.