| 摘要 |
Thls invention relates to a cathode materlal for a lithium ion secondary battery, which cathode material comprises a compound of the formula Li1-x-aAxNi1-Y-b-BYO2. wherein: A is an alkaline earth metal component selected from the group consisting of (1) at least two of magnesium, calcium, strontium and barium, (2) strontium alone and (3) barium alone; B is at least one transition metal element other than N1; X is the total number of moles of A and if A consists of more than one alkaline earth metal element, then X is the total number of moles of all alkaline earth metal elements; Y is the total number of moles of B and if B consists of more than one transitlon metal element, then Y is the total number of moles of all transition metal elements; and X, Y, a and b satisfy the respective equations: 0 < X 0 < Y - 0.10 - 0.15 This invention also relates to a method of preparing a cathode material for a lithium ion secondary battery, comprising the steps of: mixing a starting compound containing lithium and A with a starting compound containing nickel and B; heating the mixture in an oxidizing atmosphere. Further, this invention relates to a nonaqueous solvent type secondary battery. The present invention enables a cathode material exhibiting a large capacity and excellent charge and discharge cycle and a also a secondary battery comprising the same. |
