High-Energy Aqueous Sodium-Ion Batteries Using Water-in-Salt Electrolytes and 3D Structured Electrodes

• DOI: 10.1021/acsami.4c15832
• Publication Date: 2025-01-21T18:04:17Z
• Authors: Zhiyin Yang; Ailun Huang; Cheng-Wei Lin; Bradley C. Kroes; Xueying Chang; Maher F. El-Kady; Yuzhang Li; Richard B. Kaner
• Keywords: Energy density

Aqueous sodium-ion batteries (SIBs) are gradually being recognized as viable solutions for large-scale energy storage because of their inherent safety well low cost. However, despite recent advancements in water-in-salt electrolyte technologies, the challenge identifying anode materials with sufficient specific capacity persists, complicating wider adoption these batteries. This study introduces an innovative and straightforward approach synthesizing vanadium oxide laser-scribed graphene (VOx-LSG) composites, which function effective aqueous By combining a rapid laser-scribing technique precise thermal control, method not only allows changing morphology oxide, but also tuning its oxidation state. is achieved while embedding electrochemically active particles within highly conductive scaffold. When paired Prussian blue-based cathode (Na1.88Mn[Fe(CN)6]0.97) concentrated NaClO4-based electrolyte, battery's charge mechanism found to be largely surface-controlled, leading exceptional rate performance. The full cell demonstrates capacities 128 mA h/g@0.05 A/g 65.6 h/g@1 A/g, density 47.7 W h/kg, outperforming many existing strategy offers promising path forward integrating efficient, eco-friendly, low-cost into large devices systems.