Abstract: Electrode active material of the invention is such that a Li3PO4 phase is mixed in with an amorphous iron-phosphate complex having a LixFePyOz composition. Applying the electrode active material of the invention to a secondary battery inhibits an irreversible reaction which reduces the irreversible capacity, thus enabling a high capacity to be maintained even when it is used at a high potential.

Abstract: Electrode active material of the invention is mainly an amorphous transition metal complex represented by AxMPyOz (where x and y are values which independently satisfy 0?x?2 and 0?y?2, respectively, and z=(x+5y+valence of M)/2 to satisfy stoichiometry; also, A is an alkali metal and M is a metal element selected from transition metals), and has a peak near 220 cm?1 in Raman spectroscopy. Applying the electrode active material of the invention to a nonaqueous electrolyte secondary battery increases the capacity of the nonaqueous electrolyte secondary battery.

Abstract: Disclosed is an ion-conductive material which comprises an ionic liquid and can realize a higher level of safety. Also disclosed is an electrochemical device using the ion-conductive material. Further disclosed is a method for manufacturing an electrochemical device. An ion-conductive material comprising an ionic liquid satisfying the following conditions: the ionic liquid comprises two or more types of anion, such that at least one type thereof is an anion having a structure in which one or more electron-withdrawing groups are bonded to a central atom having one more non-covalent electron pairs; and the ionic liquid has a maximum exothermic heat-flow peak height no greater than 2 W/g as measured by DSC (measurement temperature range: ordinary temperature to 500° C., rate of temperature rise: 2° C./minute). Preferably, the ion-conductive material comprises an ionic liquid having a gross calorific value of no greater than 1000 J/g as measured by the DSC.

Abstract: The main object of the invention is to obtain LiMnPO4 having an excellent crystalline and a high purity at a lower temperature. The present invention provides a method for manufacturing LiMnPO4 including the steps of: precipitating for obtaining precipitate of manganese hydroxide (Mn(OH)x) by adding a precipitant to a Mn source solution in which a Mn source is dissolved; reducing for obtaining a reduced dispersion solution by dispersing the precipitate in a reducing solvent; adding for obtaining an added dispersion solution by adding a Li source solution and a P source solution to the reduced dispersion solution; pH adjusting for adjusting the pH of the added dispersion solution in the range of 3 to 6 to obtain a pH-adjusted dispersion solution; and synthesizing for synthesizing by reacting the pH-controlled dispersion solution by a heating under pressure condition.

Abstract: A process for the production of nano-structured olivine lithium manganese phosphate (LiMnPO.sub.4) electrode material comprising of the following steps: sol gel preparation in a chelating environment; preparation of lithium manganese phosphate/carbon composite by ball-milling; and electrode preparation.