K-ion batteries (KIBs) are promising for large-scale electrical energy storage owing to the abundant resources and the electrochemical specificity of potassium. Among the positive electrode materials for KIBs, vanadium-based polyanionic...
A phosphite-based layered polyanionic material, Na2[(VOHPO3)2(C2O4)]·2H2O, exhibits a superior rate performance (∼80 mA h g−1 at 10C rate) and a long-term cycling stability for 1000 cycles at 2C rate in Na cells.
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