| 摘要 |
PURPOSE:To obtain an active material of excellent charge discharge characteristics efficiently by the heat treatment at a specified temperature of a deposit or residual solid substance obtained by melting and vaporizing a vanadate. CONSTITUTION:An alkali metal or ammonium salt of vanadic acid is dissolved in an aqueous solution. The solution is then concentrated, and the deposit or the residual solid substance therefrom obtained is heat-treated at a temperature of about 150 to 350 deg.C to obtain an electrode active material of vanadium oxide group. If the temperature of the heat treatment is lower than 150 deg.C the condensation of vanadium acid is not enough and also the removal of physically absorbed water is not enough, so that the temperature is improper. If the temperature exceeds 350 deg.C crystal water is removed and the substance is transformed to vanadium pentoxide, so that the temperature is also improper. The production process is simple, thereby mass production and cost reduction become possible and moreover an active material of excellent charge discharge characteristics can be efficiently obtained. |
