| 摘要 |
Disclosed are primary materials, precursor materials and final materials as well as methods to prepare these materials. The final materials are mixed lithium transition metal oxides, useful as performance optimized cathode materials for rechargeable lithium batteries. The transition metal is a solid solution mixture of manganese, nickel and cobalt, M=(Mn l-u Ni u ) l-u-y Co y , with 0.2 < u < 0.7 and 0.1 < y < 0.9 where the transition metal composition of cobalt, as well of manganese-nickel changes significantly from the inner bulk towards the outer bulk. This allows to account for different performance requirements of inner bulk, outer bulk and surface. The final materials are prepared by solid state reaction from precursor materials, which are prepared from primary materials. The primary materials can contain additional anions or cations. The primary materials are prepared by a coprecipitation reaction, where a hydroxide or carbonate based transition metal compound is precipitated onto the surface of seed-particles, the precipitation being characterized by a transition metal composition of the precipitate that differs significantly from the transition metal composition of the seed-particles. |
