High capacity aqueous periodate batteries featuring a nine-electron transfer process

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Development of high-performance aqueous battery systems is crucial for sustainable energy.
• Existing cathode materials often face limitations in capacity and stability.
• Novel materials are needed to enhance energy density and cycle life.

Purpose of the Study:

• To introduce sodium manganese periodate (NaMnIO₆) as a novel cathode material for aqueous batteries.
• To investigate the performance of NaMnIO₆ in prototype battery systems.
• To explore the potential of advanced battery designs, including replaceable electrodes and 3D-printed casings.

Main Methods:

• Synthesis and characterization of sodium manganese periodate (NaMnIO₆).
• Fabrication of prototype aqueous batteries using NaMnIO₆ cathodes and various anodes.
• Electrochemical testing to evaluate specific capacity, specific energy, and discharge processes.
• Utilized purified carbon nanotubes (CNTs) as conductive cathode additives.
• Employed acid-salt water dual electrolytes with an anion exchange membrane to mitigate anode corrosion.

Main Results:

• NaMnIO₆ exhibited a nine-electron discharge process, contributing to high performance.
• Specific capacity reached 750 mAh g^-1, achieving nearly 94% of the theoretical capacity.
• The magnesium (Mg) anode system demonstrated the highest specific energy of 746 Wh kg^-1.
• Prototype batteries featured replaceable electrodes and 3D-printed casings.

Conclusions:

• Sodium manganese periodate (NaMnIO₆) is a promising cathode material for high-performance aqueous batteries.
• The developed battery system shows excellent capacity and energy density, nearing theoretical limits.
• The design incorporating replaceable electrodes and 3D-printed casings offers enhanced practicality and sustainability.