Lithium-ion battery materials with improved properties

摘要

A cobalt-containing phosphate material can comprise lithium (Li) (or, alternatively or additionally other alkali metal(s)), cobalt (Co), phosphate (PO4), and at least two additional metals other than Li and Co (e.g., as dopants and/or metal oxides), and can have a molar ratio of Co to a total amount of Co and the additional metals (e.g., as dopants and/or metal oxides) of at least 0.2, at least 0.3, at least 0.5, at least 0.7, or at least about 0.75. The cobalt-containing phosphate material can have a molar ratio of Co to a total amount of Co and the additional metals (e.g., as dopants and/or metal oxides) ranging from 0.2 to 0.98, from 0.3 to 0.98, from 0.3 to 0.94, from 0.5 to 0.98, from 0.5 to 0.94, or alternatively from 0.5 to 0.9, from 0.7 to 0.9, or from 0.75 to 0.85.

主权项

1. An electrode material comprising
an active material comprising (i) a first phase comprising lithium (Li), cobalt (Co), iron (Fe), phosphate (PO4), and at least one additional metal selected from titanium (Ti) or vanadium (V), wherein the active material has a molar ratio of Co to a total amount of Co, Fe, and the at least one additional metal of at least 0.70, and (ii) a second phase comprising a metal oxide wherein the metal in the metal oxide is the same metal as the at least one additional metal in the first phase, the electrode material having its specific capacity at a voltage of 4.5 V which is at least 10% of its specific capacity at a voltage of 2.0 V, as measured upon discharge at a current of 7.5 mA/g from 4.95 V to 2.0 V versus a Li/Li+ counterelectrode.