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Abstract

In one embodiment, an active cathode material comprises a mixture that includes: at least one of a lithium cobaltate and a lithium nickelate; and at least one of a manganate spinel represented by an empirical formula of Li.sub.(1+x1)(Mn.sub.1-y1A'.sub.y1).sub.2-x1O.sub.z1 and an olivine compound represented by an empirical formula of Li.sub.(1-x2)A''.sub.x2MPO.sub.4. In another embodiment, an active cathode material comprises a mixture that includes: a lithium nickelate selected from the group consisting of LiCoO.sub.2-coated LiNi.sub.0.8Co.sub.0.15Al.sub.0.05O.sub.2, and Li(Ni.sub.1/3Co.sub.1/3Mn.sub.1/3)O.sub.2; and a manganate spinel represented by an empirical formula of Li.sub.(1+x7)Mn.sub.2-y7O.sub.z7. A lithium-ion battery and a battery pack each independently employ a cathode that includes an active cathode material as described above. A method of forming a lithium-ion battery includes the steps of forming an active cathode material as described above; forming a cathode electrode with the active cathode material; and forming an anode electrode in electrical contact with the cathode via an electrolyte. A system comprises a portable electronic device and a battery pack or lithium-ion battery as described above.

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