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(a–c) Three P environments (present in a 1:1:1 ratio) and (d, e) two Li environments (which are present in a 1:1 ratio) in the Li2/3CoPO4 structure. Because M2 = M2′, a and b are equivalent. (f) There are 8 Liβ sites (shown in green), 4 of which must be removed for charge balancing (Co2+, Co3+ and Liα are shown in blue, magenta, and orange, respectively).
