Patent ID: 8206852

Claim:
A lithium-containing metal composite oxide comprising paramagnetic and diamagnetic metals, the composite oxide satisfying any one of the following conditions: (a) the ratio of intensity between a main peak of 0±10 ppm (I 0ppm ) and a main peak of 240±140 ppm (I 240ppm ), (I 0ppm /I 240ppm ), is less than 0.117·Z wherein Z is the ratio of moles of the diamagnetic metal to moles of lithium; (b) the ratio of line width between the main peak of 0±10 ppm (I 0ppm ) and the main peak of 240±140 ppm (I 240ppm ), (W 240ppm /W 0ppm ), is less than 21.45; and (c) both the conditions (a) and (b), the peaks being obtained according to the following 7 Li—NMR measurement conditions and means: [Measurement Conditions] a 300-MHz solid state NMR system; MAS spinning rate: 32 kHz; spectral frequency: 116.6420 MHz; temperature: room temperature (25° C.); chemical shift value standard: 1M LiCl in H 2 O; pulse sequence: spin echo (90°-τ1-180°-τ2); spectrum width: 500,000 Hz; pulse length: 90° pulse length −2.25 μsec, and 180° pulse length −4.50 μsec; dwell time (τ1): 31.25 μsec; and pulse delay: 2 sec.