HIGHLY HOMONOGENEOUS SPINEL Li1+XMn2-XO4+Y INTERCALATION COMPOUNDS AND METHOD FOR PREPARING SAME

摘要

A novel method of preparing a spinel Li1+XMn2-XO4+Y intercalation compound with low lattice distortion and a highly ordered and homogeneous structure for 4 V secondary lithium and lithium ion cells is provided. The method of preparing the spinel Li1+XMn2-XO4+Y intercalation compound comprises providing a spinel Li1+XMn2-XO4 intercalation compound having a lithium to manganese mole ratio of between about 1.02:2 and 1.1:2 and firing the spinel at different temperature ranges with corresponding gas flow rates to form the spinel Li1+XMn2-XO4+Y intercalation compounds. The spinel Li1+XMn2-XO4+Y intercalation compounds have a mean X value of between about 0.01 and 0.05, a mean Y value of between about -0.02 and 0.04 and a full width at half maximum of the x-ray diffraction peaks at a diffraction angle 2 theta of planes (400) and (440) using CuK alpha 1 rays of between about 0.08 DEG and 0.13 DEG . The spinel Li1+XMn2-XO4+Y intercalation compounds may be used in the positive electrodes of secondary lithium and lithium ion cells to provide cells having high specific capacities and long cycling lives.