Anthraquinone derivative as high-performance anode material for sodium-ion batteries using ether-based electrolytes

The cells with C14H6O4Na2-CNT electrode deliver a reversible capacity of 173 mAh g-1 and an ultra-high initial Coulombic efficiency of 98% at the rate of 0.1 C. Moreover, the average Na insertion voltage of 1.27 V vs. Na+/Na makes it a unique and safety battery material, which would avoid the plating of Na and formation of solid electrolyte interface.239