TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The silicate compound is silicate borate compound having compositional formula: A2-x+aMbSi1-xBxO4-x+c12 (2) obtained from molten material having compositional formula: A2-x+aMbSi1-xBxO4-x+c11 (1).x=more than 0 and 0.7 or less;andc11,c12=number based on a,b and valence of M.Preferred Material: The molten material (1) is obtained by heating raw material containing a compound (C1) containing element (A), its carbonate, hydrogencarbonate, hydroxide, silicate, phosphate, hydrogen phosphate salt, borate, nitrate, chloride, sulfate, acetate, and oxalate, a compound (C2) containing element (M), its oxide, oxyhydroxide, silicate, borate, phosphate, chloride, nitrate, sulfate, and organic salt, a compound (C3) containing silicon, silicon oxide, silicate of element (A), silicate of element (M), and alkoxide of silicon, and a compound (C4) containing boron chosen from boron oxide, boric acid, borate of element (A), and borate of element (M). The silicate compound is silicate borate phosphate compound having compositional formula: A2-x-y+aMbSi1-(x+y)BxPyO4-x+c22 (4) obtained from molten material having compositional formula: A2-x-y+aMbSi1-(x+y)BxPyO4-x+c21 (3).y=x;x+y=more than 0 and 0.7 or less;andc21,c22=number depending on a, b and valence of M.The molten material (3) is obtained by heating raw material containing compounds (C1)-(C4) and a compound containing phosphorus chosen from phosphorus oxide, ammonium phosphate, ammonium hydrogen phosphate, boron phosphoric acid, phosphoric acid, polyphosphoric acid, phosphorous acid, hypophosphorous acid, phosphate of element (A), and a phosphate of element (M). The silicate borate compound contains olivine-type crystal grain having compositional formula: Li2-x+a(FemMn1-m)bSi1-xBxO4-x+c12 (5) obtained from molten material having compositional formula: Li2-x+a(FemMn1-m)bSi1-xBxO4-x+c11 (5A).m=0-1.The silicate borate phosphate compound has compositional formula: Li2-x-y+a(FemMn1-m)bSi1-(x+y)BxPyO4-x+c22 (6) obtained from molten material having compositional formula: Li2-x-y+a(FemMn1-m)bSi1-(x+y)BxPyO4-x+c21 (6A). The cooling process is performed at cooling rate of -10-3 degrees C/second to -10-10 degrees C/second. The heating is carried out at 500-1000 degrees C. The solidified material is obtained from carbon source chosen from organic compound and a carbon powder. The ratio of carbon equivalent amount (mass) in carbon source is 0.1-20 %mass with respect to total amount of solidified material. Preferred Definitions:    A=Li;and    M=Fe and/or Mn.