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Layered transition metal oxides NaxNi1/3Fe1/3Mn1/3O2 are promising cathode materials for sodium ion batteries. Here we report the large scale synthesis of NaNi1/3Fe1/3Mn1/3O2 (NaNFM) by using hydroxide co-precipitation combined with solid-state reaction method. The obtained NaNFM showed good electrochemical performance with 1C rate (130 mA g−1) capacities of 125 mAh g−1 (55°C), 122 mAh g−1 (25°C), 95 mAh g−1 (−10°C), and 72 mAh g−1 (−20°C), respectively. 1 Ah soft-packed batteries using the prepared NaNFM as cathode and hard carbon as anode were prepared and investigated. Electrochemical tests showed that the as prepared 1 Ah soft-packed batteries exhibited excellent cycling performance with capacity retention over 73% after 500 cycles at 1C rate. The ex situ XRD experiments revealed that the charge/discharge process of NaxNi1/3Fe1/3Mn1/3O2 cathode showed excellent reversibility and the layered crystallographic structure of the NaNFM electrode remained stable after 500 cycles. This work demonstrates the NaNi1/3Fe1/3Mn1/3O2 is a promising cathode material for practical application in sodium ion batteries.
Wang et al. (Fri,) studied this question.