Co/N-doped carbon-coated Na3V2(PO4)2F3 cathode for SIB via a bimetallic MOF template

The Na 3 V 2 (PO 4 ) 2 F 3 /Co/N-PC composite was prepared based on nitrogen-doped porous carbon materials containing cobalt (Co/N-PC), which is obtained through high-temperature pyrolysis of bimetallic Co/Zn-MOF. The electrochemical test results showed that the discharge specific capacity of Na 3 V 2 (PO 4 ) 2 F 3 /Co/N-PC composite was 126.66 mAh/g at 0.1C, an increase of 15.6 % compared with Na 3 V 2 (PO 4 ) 2 F 3 /N-PC(109.56 mAh/g). The capacity retention rate was 91.84 % after 100 cycles and the R SEI of the Na 3 V 2 (PO 4 ) 2 F 3 /Co/N-PC composite (48.62 Ω) outperforms that of the Na 3 V 2 (PO 4 ) 2 F 3 /N-PC composite (81.55 Ω). This work applied the metal/carbon hybrid materials obtained through high temperature pyrolysis of bimetallic organic frameworks were employed in sodium-ion batteries, thereby offering enhanced potential for the advancement of sodium-rich phosphoric acid modified materials.