Abstract: A lamellar sodium-cobalt-manganese oxide represented by the general formula NaxCoyMn1−yO2 (where 0.6≦x≦0.8, 0.4≦y≦0.6) is disclosed, which is obtained by the steps of: mixing a sodium salt, a cobalt salt and a manganese salt in an aqueous solution state so as to be a molar ratio of sodium, cobalt and manganese of x: y: 1−y (where 0.6≦x≦0.8, 0.4≦y≦0.6) and drying the obtained mixture, sintering the obtained dried body in an oxygen-containing gas at 700 to 900° C., and quenching the sintered body from a temperature between 700° C. and 800° C. The lamellar sodium-cobalt manganese oxide of the present invention has a uniform composition and a single crystal structure, which is useful as an electrode active material for a lithium ion secondary battery.

Abstract: A molded solid electrolyte, a molded electrode and an electrochemical device which contain a polymer composition consisting of 50 to 100 wt % of 1,2-polybutadiene having a 1,2-vinyl content of 70% or more and a crystallinity of 5 to 50%, and 0 to 50 wt % of polar rubber. According to the present invention, it becomes possible to obtain a molded solid electrolyte provided with high ionic conductivity and high workability, or a molded electrode having high electrode activity, and it is also possible to obtain an electrochemical device showing excellent activating properties by using the molded solid electrolyte and the molded electrode.

Abstract: A solid-state secondary lithium battery with excellent charge and discharge cycle characteristics, using a negative electrode active material which shows discontinuous change of potential caused by the lithium ion insertion and extraction reactions, wherein the amount of the lithium ion inserted, until discontinuous change of potential of the negative electrode takes place, is equal to or smaller than the maximum amount of extraction of lithium ions within the range where lithium ions are inserted and extracted into or from the lithium transition metal oxide reversibly, and a battery assembly using these batteries.

Abstract: A lithium secondary battery free from problems encountered with a positive electrode active material exhibiting an electrode potential of not lower than 4.5 volts versus Li—a deterioration in performances because of self-discharge with decomposition of the electrolyte. The lithium secondary battery uses a sulfide based lithium ion conductive solid electrolyte as the electrolyte. Thus, a lithium secondary battery with a very low self-discharge tendency, that is, with the decomposition of electrolyte highly controlled, can be obtained even using the positive electrode active material generating a high voltage.

Abstract: The present invention related to a lithium battery comprising a pair of electrodes disposed by means of a separator in the presence of a lithium ion conductive electrolyte, wherein at least one of said electrodes comprises a lithium iron oxide having a corrugated layer crystal structure and represented by the formula (1): Lix(Fe(1−y)My)O2  (1) wherein M represents at least one element selected from the group consisting of cobalt, nickel, manganese and aluminum, x is more than 0 and less than 2, and y is 0.005 to 0.1, Which has improved battery characteristics, an excellent cycle life and a higher electric current operated.

Abstract: A lithium ion conductive inorganic solid electrolyte is used as an electrolyte in a lithium secondary battery which uses a transition metal chalcogenide or a lithium• transition metal chalcogenide as an active material for negative electrode. There is provided a lithium secondary battery improved in reversibility and in charge and discharge cycle characteristics as compared with lithium secondary batteries which use a liquid electrolyte or a molten salt electrolyte as the electrolyte.

Abstract: A totally-solid lithium secondary battery can be improved in charge and discharge characteristics by adding to the negative electrode a first transition metal chalcogenide or lithium•transition metal chalcogenide which acts as the active material for negative electrode and a second transition metal chalcogenide or lithium•transition metal chalcogenide which inhibits precipitation of metallic lithium.

Abstract: Disclosed are a molded solid electrolyte and molded electrode having excellent electrochemical properties and high procesability. As a binder for these molded articles, a hydrogenated block copolymer is used which is obtained by hydrogenating a straight chain or branched block copolymer containing a block (A) comprising polybutadiene whose 1,2-vinyl bond content is 15% or less and a block (B) comprising a butadiene (co)polymer consisting of 50 to 100% by weight of butadiene and 0 to 50% by weight of other monomers in which 1,2-vinyl bond content of butadiene portion is 20 to 90%, wherein (A)/(B)=5 to 70/95 to 30% by weight.

Abstract: A solid-state secondary lithium battery with excellent charge and discharge cycle characteristics, using a negative electrode active material which shows discontinuous change of potential caused by the lithium ion insertion and extraction reactions, wherein the amount of the lithium ion inserted, until discontinuous change of potential of the negative elctrode takes place, is equal to or smaller than the maximum amount of extraction of lithium ions within the range where lithium ions are inserted and extracted into or from the lithium transition metal oxide reversibly, and a battery assembly using these batteries.

Abstract: A solid-state secondary lithium battery with excellent charge and discharge cycle characteristics, using a negative electrode active material which shows discontinuous change of potential caused by the lithium ion insertion and extraction reactions, wherein the amount of the lithium ion inserted, until discontinuous change of potential of the negative elctrode takes place, is equal to or smaller than the maximum amount of extraction of lithium ions within the range where lithium ions are inserted and extracted into or from the lithium transition metal oxide reversibly, and a battery assembly using these batteries.

Abstract: A method for producing an electrochemically advantageous lithium ion-conductive solid electrolyte with high ionic conductivity, low electronic conduction and electrochemical stability is disclosed. The method comprises the steps of synthesizing lithium sulfide by reacting lithium hydroxide with a gaseous sulfur source at a temperature of not less than 130.degree. C. and not more than 445.degree. C., thermally melting plural compounds containing at least silicon sulfide and the synthesized lithium sulfide, and cooling the molten mixture. The silicon sulfide is synthesized by the steps of adding a silicon powder to molten sulfur while stirring to disperse the silicon powder in the molten sulfur and heating the silicon powder-dispersed sulfur in a reaction chamber under reduced pressure.

Abstract: A lithium iron oxide which can be used as an electrode active material for a lithium battery is disclosed. A lithium iron oxide represented by Li.sub.x FeO.sub.2, where 0<x<2, having a tunnel structure similar to .beta.-FeO(OH) can be synthesized by heating a suspension prepared by suspending .beta.-FeO(OH) and a lithium compound in an alcohol at a temperature of not lower than 50.degree. C., more preferably at a temperature of lower than the boiling point of the alcohol used for the suspension.

Abstract: A protonic conductor comprises a silicon oxide doped with a Br.o slashed.nsted acid and a thermoplastic elastomer. It has excellent protonic conductivity, which is not substantially lowered even in a dry atmosphere and thereby ensures excellent working properties.

Abstract: A solid-state lithium secondary battery having a high safety and being free from the formation and growth of lithium dendrites is disclosed. It comprises a cathode having as an active material at least one compound selected from the group consisting of oxides and sulfides of a transition metal, a lithium ion-conductive solid electrolyte of a glass comprising Li.sub.2 S, and an anode having as an active material a metal capable of forming an alloy with lithium, wherein at least one of the cathode active material and anode active material contains lithium.

Abstract: An ion conductive, fibrous solid electrolyte having a high ion conductivity, a distinguished mechanical strength and a good processability is provided by making an ion conductive solid electrolyte fibrous and glassy and shaping the resulting fibrous glassy solid electrolyte alone or together with thermoplastic resin fibers, and the shaped product is used in a cell as a solid electrolyte layer.

Abstract: Electrochemical devices comprise at least a pair of electrodes and a lithium ion conductive electrolyte provided between the pair of electrodes. At least one of the electrodes comprises a lithium nitride-metal compound having a one-dimensional chain structure. By this, the number of end groups which greatly take part in characteristic degradation of the device can be reduced significantly, ensuring good characteristic properties. The devices include lithium secondary cells, electric double-layer capacitors, and electrochemical display devices.

Abstract: A sulfide-based lithium ion conductive solid electrolyte having a high ion conductivity and a high decomposition voltage contains crosslinking oxygen ions and silicon ions combined with the crosslinking oxygen ions in a structure of ##STR1##

Abstract: The present invention provides an ionic conductor used for a solid electrolyte with a high ionic conductivity including fluorine, an element belonging to the fourth group or the second group of the periodic table and zirconium. The invention also provides an ionic conductor including fluorine, lead or tin and zirconium. The invention also provides an ionic conductor being Pb.sub.1-x Sn.sub.1-y Zr.sub.x+y F.sub.4+2x+2y wherein 0<x+y.ltoreq.0.16. The invention further provides an ionic conductor being Pb.sub.1-x Sn.sub.1-y Zr.sub.x+y F.sub.4+2x+2y wherein 0<x+y.ltoreq.0.02.

Abstract: A lithium-ion conducting solid electrolyte of the present invention comprises a parent material, a lithium-ion conducting sulfide glass represented by the formula Li.sub.2 S--X (X is at least one sulfide selected from the group consisting of B.sub.2 S.sub.3, SiS.sub.2, P.sub.2 S.sub.5, Al.sub.2 S.sub.3, and GeS.sub.2), and a high-temperature lithium-ion conducting compound (i.e. Li.sub.3 PO.sub.4 or Li.sub.2 SO.sub.4). The lithium-ion conducting solid electrolyte has higher ionic conductivity and higher decomposition voltage compared to the parent material. By the use of this solid electrolyte for electrical/chemical components such as batteries, condensers, electrochromic displays, and the like, electronic apparatus that includes such elements may have improved performance.

Abstract: A solid-state electrochemical cell is disclosed that comprises at least one pair of electrodes and a silver-ion conductive solid-electrolyte layer disposed between the electrodes, wherein at least one of the electrodes contains as an electrode active material a compound oxide composed of silver and transition metal oxide. The electrochemical cell is used as a solid-state rechargeable battery, solid-state analogue memory cell, or the like.