Nonaqueous secondary battery and method of using the same
AssigneeHitachi Maxell Energy, Ltd.
InventorsFusaji Kita, Hideki Tsubata, Hiroyasu Inoue
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Abstract
A nonaqueous secondary battery containing a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, in which the positive electrode comprises, as active materials, three or more lithium-containing transition metal oxides having different average particle sizes, those transition metal oxides comprise a transition metal element, the transition metal element of the transition metal oxide having the smallest average particle size is partially substituted with a metal element other than the transition metal element, and the density of the positive electrode mixture layer is t 3.8 g/cm3 or more.
Claims10
A nonaqueous secondary battery comprising:
- a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte, wherein the positive electrode comprises an active material consisting of at least three lithium-containing transition metal oxides having different average particle sizes and at least five inflection points in a particle size distribution curve of the mixture of said at least three lithium-containing transition metal oxides, wherein the lithium-containing transition metal oxides comprise at least one transition metal element M1 selected from the group consisting of Co, Ni and Mn, and the transition metal element M1 of the lithium-containing transition metal oxide having the smallest average particle size is partially substituted with a metal element M2 other than the transition metal element M1, wherein the transition metal element M2 comprises Mg and at least one metal element selected from the group consisting of Ti, Zr, Ge, Nb, Al and Sn, wherein a content of the transition metal element M2 in the lithium-containing transition metal oxide having the smallest average particle size is largest among said at least three lithium-containing transition metal oxides.
Dependencies are inferred from the claim text.