Abstract
Single-phase samples of differently distorted P’2-Na2/3Mn0.9Me0.1O2 (Me = Mg, Ti, Co, Ni, Cu, and Zn) are synthesized by a conventional solid-state reaction. Cooperative Jahn-Teller distortion, which causes an orthorhombic lattice from a distortion-free hexagonal lattice, proportionally increases with increase in the concentration of Jahn-Teller ions of MnIII and CuII in P’2-Na2/3Mn0.9Me0.1O2. All of samples deliver initial reversible capacity approaching 230 mAh g-1 in non-aqueous Na cells. The redox potential of Mn(III/IV) with sodium extraction is highly correlated with degree of the dis-tortion. Because CuII is only Jahn-Teller active among the substituent ions, P’2-Na2/3Mn0.9Cu0.1O2 has remarkable distor-tion than other samples, resulting in both better cycle and rate performances in Na cells.
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