Cathode compositions for lithium-ion batteries
A lithium-ion battery has (a) an anode; (b) a cathode having a cathode composition of the formula Li[M 4 y M 5 1-2y Mn y ]O 2 , wherein 0.083<y<0.5 with the proviso that M 4 and M 5 do not include chromium, and wherein M 4 is Co and M 5 includes the combination of Li and Ni; and (c) an electrolyte.
1. A lithium-ion battery comprising:
an anode;
a cathode having a cathode composition of the formula Li[M 4 y M 5 1-2y Mn y ]O 2 , wherein 0.083<y<0.5 with the proviso that M 4 and M 5 do not include chromium, and wherein M 4 is Co and M 5 includes the combination of Li and Ni; and
an electrolyte.
2. A lithium-ion battery according to claim 1 wherein M 5 further comprises Co, Fe, Cu, Zn, V, or combinations thereof.
3. A lithium-ion battery according to claim 1 wherein 0.167<y<0.5.
4. A lithium-ion battery according to claim 1 wherein the composition has a c-axis lattice constant of about 14.17 to about 14.28.
5. A lithium-ion battery according to claim 1 wherein M 4 is Co and M 5 includes the combination of Li and Ni, and wherein the composition has a c-axis lattice constant of about 14.20 to about 14.27.
6. A lithium-ion battery according to claim 1 wherein M 4 is Co and M 5 includes the combination of Li and Ni, and wherein the composition has a c-axis lattice constant of about 14.24 to about 14.26.
7. A lithium-ion battery according to claim 1 wherein the composition has a reversible capacity of at least about 200 mAh/g.
8. A lithium-ion battery according to claim 1 wherein the composition has an onset temperature above 185° C. as analyzed by differential scanning calorimetry.