High-stability and high-capacity aqueous sodium-ion battery using a high-entropy oxide cathode: intercalation vs. capacitive sodium charge storage

Key Points

• To evaluate the performance of a high-entropy oxide cathode in aqueous sodium-ion batteries compared to traditional storage mechanisms.
• Investigated the composition of high-entropy oxide cathode materials.
• Analyzed battery performance in terms of stability and capacity during sodium intercalation and capacitive storage.
• Tested the NaMn 0.2 Ni 0.2 Co 0.2 Fe 0.2 Al 0.1 Cu 0.1 O 2 cathode in aqueous conditions.
• The high-entropy oxide cathode exhibited enhanced stability in aqueous environments.
• Increased charge storage capacity was noted compared to conventional sodium-ion batteries.
• Successful intercalation and capacitive storage were observed, outperforming typical configurations.