| abstract |
The purpose of the present invention is to produce active material particles for lithium-ion rechargeable batteries, the active material particles having good surface smoothness, improve cycle characteristics while minimizing the increase in internal resistance of the active material layer, and which minimize the breakdown of electrolyte, even at high potential. The active material particles for lithium-ion rechargeable batteries (X) is obtained by bringing into contact a composition containing a compound (a) having a metal element (M) selected from a group consisting of [Li, Mg, Ca, Sr, Ba, Pb, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Cu, Zn, Al, In, Sn, Sb, Bi, La, Ce, Pr, Nd, Gd, Dy, Er and Yb] with a composition containing a fluoropolymer (b) having recurring units represented by -[CF 2 - CR 1 R 2 ]- (R 1 , R 2 are H, F or -CF 3 ), and heating. |