Patent ID: 8057711

Claim:
A cathode active material comprising a mixed crystal, the mixed crystal having: a first crystalline substance having one or more members with the general formulas Li x M y (XO 4 ) z , LiMXO 5 , LiMXO 6 and LiMX 2 O 7 , wherein: 0<x/zâ‰¦1 and 0â‰¦y/zâ‰¦1; M is selected from elements Na, Mn, Fe, Co, Ni, Ti, Nb and V; X is selected from elements P, S, As, Mo and W; and a second crystalline substance having one or more members with the general formula A a M b N c O d , wherein: A, M and N are different metals selected from groups IIA, IIIA, IVA, VA, IB, IIB, IIIB, IVB, VB, VIIB, VIIB and VIII of the periodic table; 0â‰¦aâ‰¦6, 0<bâ‰¦6, 0<câ‰¦6 and 0<dâ‰¦12; wherein a and b cannot both be 0 at the same time, wherein the first crystalline substance has a lattice, and at least a part of the second crystalline substance is received by and distributed in the lattice of the first crystalline structure, wherein the first crystalline substance and the second crystalline substance has molar ratios of about 1 to 0.01-0.05, and wherein the cathode active material has an electrical conductivity of about 0.01 to 10 S/cm at about 25Â° C.