Tuned In Situ Growth of Nanolayered rGO on 3D Na 3 V 2 (PO 4 ) 3 Matrices: A Step toward Long Lasting, High Power Na‐Ion Batteries

Even though significant improvements have been made in sodium ion batteries, battery management mandates that all batteries in a pack are kept at an acceptable level of more than 80% capacity retention after a long cycle when it is tested for emergencies. Based on these realistic facts, the present study profitably exploits in situ grown reduced graphene oxide on 3D Na 3 V 2 (PO 4 ) 3 matrices exhibiting a high rate performance and a specific discharge capacity of 117 mAh g −1 . Unlike the earlier literature reports, it is demonstrated that the fabricated electrode shows >85% capacity retention after 6000 cycles at 10 C, the longest cycle life reported till date. The work also reasons in‐depth the outstanding sodiation/desodiation capabilities to the low hysteresis voltage and how these electrodes can be used for deep discharges by extending the potential window to 1.3–3.8 V (vs Na/Na + ) resulting in a noteworthy specific capacity of ≈165.4 mAh g −1 at 1 C.