Self-supported cobalt phosphate nanoarray with pseudocapacitive behavior: An efficient 3D anode material for sodium-ion batteries

The topotactic conversion of cobalt phosphide nanoarray on carbon cloth (CC) into a cobalt phosphate nanoarray (CoP/CC) is presented. In this communication, the self-supported nanoneedle CoP/CC nanoarray as a 3D anode electrode for sodium-ion batteries have been comprehensively studied. The CoP/CC attains superior reversible capacity up to 840 mA h g−1 at 0.1 A g−1. Moreover, this anode also achieves a long cycling stability at 1 A g−1 with the capacity retention of 86.4% after 2000 cycles. Importantly, the pseudocapacitive behavior have existed in overall charge storage processes. •CoP nanoneedle on carbon cloth (CoP/CC) as an anode for SIBs have been comprehensively studied.•The CoP/CC exhibits a long lifespan at 1 A g−1 with excellent capacity retention of 86.4% after 2000 cycles.•The pseudocapacitive behavior have existed in overall charge storage processes.