Patent ID: 8962189
Filing Date: 2015-02-24
Classification: H01M,Y02E

Abstract:
1. A secondary battery comprising: a cathode; an anode; and an electrolytic solution, wherein the cathode includes a lithium transition metal complex compound including lithium (Li), one, or two or more transition metals, magnesium (Mg), and oxygen (O) as constituent elements, in a standardized X-ray absorption spectrum, having a horizontal axis indicating X-ray energy (eV) and a vertical axis indicating X-ray absorption intensity, of the lithium transition metal complex compound measured by an X-ray absorption spectroscopic method, a first absorption edge having absorption edge energy E1 in X-ray absorption intensity of about 0.5 exits in a range where X-ray energy is from about 1303 eV to about 1313 eV both inclusive, in a discharged state in which a discharge voltage is about 3.0 V, a second absorption edge having absorption edge energy E2 in X-ray absorption intensity of about 0.5 exits, in a charged state in which a charge voltage V is from about 4.3 V to about 4.5 V both inclusive, and the absorption edge energies E1 and E2 and the charge voltage V satisfy a relation of E2−E1≧(V−4.25)×4.