Cathode compositions for lithium ion batteries

摘要

A cathode composition for a lithium ion battery that contains lithium having the formula (a) Li_y[M¹_(1-b)Mn_b]O₂ or (b) Li_y[M¹_(1-b)Mn_b]O_1.5+c where 0<=y<1, 01 represents one or more metal elements, with the proviso that for (a) M¹ is a metal element other than chromium. The composition is in a form of a single phase having an O3 crystal structure that does not undergo a phase transformation to a spinel crystal structure when incorporated in a lithium-ion battery and cycled for 100 full charge-discharge cycles at 30 C and a final capacity of 130 mAh/g using a discharge current of 30 mA/g.