| abstract |
Provided is an electrochemically active particle suitable for use as an active material in the cathode of a lithium ion electrochemical cell, which comprises a plurality of crystals containing a first composition containing lithium, nickel and oxygen. And; a grain boundary between adjacent crystallites of a plurality of crystallites, including a grain boundary containing a second composition containing lithium, nickel, and oxygen; and a grain boundary is more lithium than a crystallite. Great electrochemical affinity for. Higher electrochemical affinity for Li increases grain boundaries and crystallite structures at grain boundaries during charging compared to bulk crystallites, and to improve cycle stability with little loss of capacitance. To stabilize. |