Cellulose‐Templated, Dual‐Carbonized Na 3 V 2 (PO 4 ) 3 for Energy Storage with High Rate Capability

Sodium‐ion rechargeable batteries are a promising candidate for large‐scale electrical energy storage systems, owing to the abundance of sodium resources. Herein, we report the development of carbon‐incorporated NASICON‐Na 3 V 2 (PO 4 ) 3 (NVP) as an active cathode material for Na‐ion batteries, using carboxymethyl cellulose (CMC) and sucrose as dual carbon sources. The interaction between CMC and sucrose resulted in the formation of a highly porous structure (surface area: 58.998 m 2  g −1 ) with increased sp 2 carbon species, facilitating mass and charge transportation. The specific capacity (104.99 mAh g −1 ) of dual‐carbonized CMC/sucrose‐NVP (CS‐NVP) was close to the theoretical capacity (117.6 mAh g −1 ). Furthermore, dual‐carbonized NVP exhibited stable cyclability, showing a specific capacity of 75.04 mA g −1 even at a high rate of 20 C.