Patent ID: 9059465
Filing Date: 2015-06-16
Classification: C01G,C01P,H01M,Y02E

Abstract:
1. An active material for a positive electrode of a lithium ion battery, said active material being made of a composite oxide of lithium, nickel, manganese and cobalt represented by a formula Li a Ni x Mn y Co z O 2 , where 1.0<a<1.3, x+y+z=1, 0.10≦y≦0.25, and 0.10≦z≦0.67, and having a layered structure, wherein, in a space expressed by, as an ordinate, a molar volume Vm of the active material calculated by lattice constants determined from diffraction angles of a (018) plane and a (113) plane appearing on a powder X-ray diffraction pattern of the active material obtained by using CuK alpha radiation and, as an abscissa, Co atom ratio n (molar %) defined by 100z/(x+y+z) of the active material, Vm and n obtained with the active material exist within a range defined by Vm=21.276-0.0117n as an upper limit and Vm=21.164-0.0122n as a lower limit, and wherein a diffraction peak of the (018) plane of the active material has a half value width of 0.200° to 0.141° and a diffraction of the (113) plane of the active material has a half value width of 0.200° to 0.129°.