Abstract
In this paper, Ni3(BO3)2 was synthesized via a simple solid-state reaction method and used as anode materials for sodium-ion batteries for the first time. The Ni3(BO3)2 exhibits a desodiation capacity of 428.9 mA h g−1 at 200 mA g−1 and a high capacity of 304.4 mA h g−1 even at 2000 mA g−1. The resulting material also shows a good cycling stability with a capacity retention of 85.4% over 50 cycles. In-situ X-ray diffraction analysis reveals the phase transition behavior of Ni3(BO3)2 in the first discharge process. Kinetics analysis reveals that the high-performance sodium storage is dominated by pseudocapacitance, especially at the high rate. These highlights indicate that Ni3(BO3)2 would have hopeful prospects as an anode material for sodium-ion batteries.
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