| abstract |
The invention provides a lithium-manganese double oxide for lithium ion batteries which makes it possible to attain excellent high-temperature cycle characteristics and high-capacity battery characteristics. A spinel-type lithium-manganese double oxide for lithium ion batteries, which is represented by the general formula: Li1+xMn2-yMyO4 (wherein M is at least one element selected from among Al, Mg, Si, Ca, Ti, Cu, Ba, W and Pb and x and y satisfy the relationships: -0.1 = x = 0.2 and 0.06 = y = 0.3) and in which d10, d50 and d90 are 2 to 5μm, 6 to 9μm, and 12 to 15μm respectively where d10, d50 and d90 refer to the particles sizes corresponding to the cumulative volumes of 10%, 50% and 90% respectively in the particle size distribution, the BET specific surface area exceeds 1.0m<SP>2</SP>/g and is 2.0m<SP>2</SP>/g or below, and the tap density is 0.5g/cm<SP>3</SP> or above and below 1.0g/cm<SP>3</SP>. |