Inhibiting dissolution strategy achieving high-performance sodium titanium phosphate hybrid anode in seawater-based...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Aqueous sodium-ion batteries (ASIBs) are promising for large-scale energy storage.
• Anode limitations, including dissolution and hydrogen evolution, hinder ASIB performance.

Purpose of the Study:

• To develop a stable and high-capacity anode for ASIBs.
• To overcome the dissolution issues of sodium titanium phosphate (NTP) anodes.

Main Methods:

• Fabrication of a bismuth (Bi)-coated sodium titanium phosphate-carbon fiber (NTP-CFs/Bi) anode.
• Electrochemical characterization of the anode's performance in ASIBs.
• Assembly and testing of a seawater-based ASIB cell.

Main Results:

• The Bi-coating effectively suppressed hydroxyl anion enrichment, preventing NTP dissolution.
• The NTP-CFs/Bi anode achieved a specific capacity of 216.8 mAh/g at 0.2 mV/s.
• High capacity retention (90.7% after 1000 cycles) and a new capacity record for NTP-based anodes were demonstrated.
• A seawater-based ASIB cell exhibited superior energy and power densities.

Conclusions:

• The Bi-coating strategy is effective in enhancing the stability and performance of NTP-based anodes.
• This work presents a viable pathway for developing long-life, high-performance anodes for ASIBs.
• The developed anode technology shows potential for practical large-scale energy storage applications.