An air-stable copper-based P2-Na7/9Cu2/9Fe1/9Mn2/3O₂ is designed and synthesized by a simple solid-state method and investigated as a positive electrode material for sodium-ion batteries. The attractive long cycling stability is demonstrated by the capacity retention of 85% after 150 cycles at 1 C rate without phase transformation. The reversible Cu²⁺/Cu³⁺ redox couple in P2 phase oxides is proved for the first time.
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Li et al. (2015) studied this question.
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