POSITIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, POSITIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY

PROBLEM TO BE SOLVED: To provide: a positive electrode material for a lithium ion secondary battery, which enables the exhibition of a high capacity even in high-speed charge; a positive electrode; and a lithium ion secondary battery using the electrode.SOLUTION: A positive electrode material for a lithium ion secondary battery comprises a dielectric represented by the following composition formula (1): (BaM1)(TiM2)O(1) [0.00≤x≤0.50; 0.00≤y≤0.50; 0.95≤z1≤1.05; 0.95≤z2≤1.05; 2.95≤z3≤3.05; M1 represents one or more elements selected from Mg, Ca, Sr, Cd, Hg, Li, Na, K, Rb, Tl, Cs and Ag; M2 represents one or more elements selected from Li, Cu, Mg, Ni, Zn, Co, Sn, Fe, Cd, Cu, Cr, Mn, Sb, Al, Yb, In, Sc, Y, Zr, Hf, Nb, Ta, Bi, W, Te and Re; and the conditions, x=y=0 and z1=z2=1.00 are not satisfied at the same time)].SELECTED DRAWING: Figure 1 【課題】高速充電においても高い容量を示すリチウムイオン二次電池用正極材料及び正極並びにこれを用いたリチウムイオン二次電池の提供。【解決手段】組成式（１）で表される誘電体を有するリチウムイオン二次電池用正極材料。（Ｂａ１−ｘＭ１ｘ）ｚ１（Ｔｉ１−ｙＭ２ｙ）ｚ２Ｏｚ３・・・（１）［０．００≦ｘ≦０．５０；０．００≦ｙ≦０．５０；０．９５≦ｚ１≦１．０５；０．９５≦ｚ２≦１．０５；２．９５≦ｚ３≦３．０５；Ｍ１はＭｇ，Ｃａ，Ｓｒ，Ｃｄ，Ｈｇ，Ｌｉ，Ｎａ，Ｋ，Ｒｂ，Ｔｌ，Ｃｓ，Ａｇから選ばれる1つ以上の元素；Ｍ２はＬｉ，Ｃｕ，Ｍｇ，Ｎｉ，Ｚｎ，Ｃｏ，Ｓｎ，Ｆｅ，Ｃｄ，Ｃｕ，Ｃｒ，Ｍｎ，Ｓｂ，Ａｌ，Ｙｂ，Ｉｎ，Ｓｃ，Ｙ，Ｚｒ，Ｈｆ，Ｎｂ，Ｔａ，Ｂｉ，Ｗ，Ｔｅ，Ｒｅから選ばれる1つ以上の元素；ｘ＝ｙ＝０かつｚ１＝ｚ２＝１．００を同時に満たさない）］【選択図】図１