Prussian blue/reduced graphene oxide composites cathode material via one-pot precipitation synthesis for enhancing capacity sodium metal pouch cell batteries

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) Korea), 2024-12, Vol.140, p.422-433
• Main Authors: Kongthong, Tanaporn, Poochai, Chatwarin, Tuantranont, Adisorn, Limthongkul, Pimpa, Pothaya, Sukanya, Chuminjak, Yaowamarn, Cheacharoen, Rongrong, Lohitkarn, Jaruwit, Maeboonruan, Nattida, Sriprachuabwong, Chakrit
• Format: Article
• Language: English
• Subjects: Ascorbic acid; Pouch cell; Prussian blue; Reduced graphene oxide; Sodium-metal batteries
• ISSN: 1226-086X
• DOI: 10.1016/j.jiec.2024.05.066

[Display omitted] •Prussian blue/reduced graphene oxide is a battery-type cathode that has been successfully used in sodium metal batteries.•A one-pot synthesis is used to produce a composite of reduced graphene oxide and Prussian blue with ascorbic acid.•Prussian blue’s open framework structure offers excellent cycle stability.•At high current densities, reduced graphene oxide provides high rate performance. The popularity of sodium metal-ion batteries (SMBs) is increasingly displacing lithium-ion batteries (LIBs). Iron-based Prussian blue (Fe4[Fe(CN)6]3) analogs promise low-cost and easily prepared cathode materials for sodium metal-ion batteries. However, the effectiveness of these materials has consistently been attributed to their inadequate electrical conductivity. In this study, we employed a one-pot synthesis technique to prepare composites of Prussian blue (PB) and reduced graphene oxide (PB/rGO) with varying rGO concentrations. Ascorbic acid was utilized as a reducing agent to convert graphene oxide (GO) into reduced graphene oxide (rGO). Following optimization, the SMB coin cell with PB/rGO(5 %) electrode exhibited an initial specific discharge capacity of 91 mAh/g at a current density of 0.3C. This electrode had exceptional rate performance and remarkable capacity retention, with 75.3 % remaining after 2000 cycles. Furthermore, the pouch cell SMB using PB/rGO(5 %) showed a high capacity of 87 mAh/g at 0.05C with an energy density of 34 Wh kg−1 and good cycle ability over 500 cycles. Notably, the performance of the SMBs surpasses that of the PB cathode, making it highly advantageous for efficient sodium ion storage in SMBs.