Polyprotic acid catholyte for high capacity dual-electrolyte Li–air batteries†
Abstract
The polyprotic acid H3PO4 in a Li2SO4 supporting electrolyte has been effectively utilized as a catholyte donating three protons in dual-electrolyte Li–air cells. The cell offers a high capacity of 740 mA h g−1 at an average cell voltage of 3.3 V with good rechargeability and stability.