Cathode material, method of preparing it and nonaqueous...

Details Cathode material, method of preparing it and nonaqueous... Cathode material, method of preparing it and nonaqueous...

H - Electricity

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H01M 4/32 (2006.01) H01M 4/26 (2006.01) C01G 53/00 (2006.01) H01M 4/02 (2006.01) H01M 4/48 (2006.01) H01M 4/52 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2162456

This invention relates to a cathode material for a lithium ion secondary battery, which cathode material comprises a compound of the formula Li1-x-a A x Ni1-y-b B y O2. 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 Ni; 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 transition 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 <= 0.10 0 < Y <= 0.30 - 0.10 <= a <= 0.10 - 0.15 <= b <= 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.

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