| 摘要 |
PURPOSE: To provide a lithium secondary battery with high energy density, allowable to deep charge/discharge, and with long life by constituting a positive electrode active material with a specified composite oxide. CONSTITUTION: A positive electrode active material is made of a composite oxide (example: Li1.03 Ni0.89 Mn0.10 B0.01 O2 ) having layer structure represented by a formula of Lia Nib Mc <1> Md <2> O2 (M<1> is Mn, and M<2> is at least one selected from B, Si, P, Ga, Ge, Sb, Tl, Pb, and Bi.). For example, the active material is mixed with acetylene black and polytetrafluoroethylene powder, the mixture is molded to form a positive electrode 1, the positive electrode 1 is pressed into a positive can 4 with a positive current collector 6, and a negative electrode (example: lithium foil) 2 is pressed in a negative can 5 through a negative current collector 7, then an electrolyte (example: LiPF6 -EC/DEC solution) and a separator 3 are combined to obtain a lithium secondary battery. |
