Exploration of a calcium–organic framework as an anode material for sodium-ion batteries

In this communication, we designed and synthesized a novel calcium–organic framework and presented it as an anode material for sodium-ion batteries. The results show that it delivers a reversible capacity of higher than 140 mA h g−1 even after 300 cycles. The remarkable performance is attributed to the high structural stability and extremely low solubility of the calcium–organic framework in electrolytes.