An Aqueous Symmetric Sodium‐Ion Battery with NASICON‐Structured Na3MnTi(PO4)3

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Abstract
A symmetric sodium‐ion battery with an aqueous electrolyte is demonstrated; it utilizes the NASICON‐structured Na3MnTi(PO4)3 as both the anode and the cathode. The NASICON‐structured Na3MnTi(PO4)3 possesses two electrochemically active transition metals with the redox couples of Ti4+/Ti3+ and Mn3+/Mn2+ working on the anode and cathode sides, respectively. The symmetric cell based on this bipolar electrode material exhibits a well‐defined voltage plateau centered at about 1.4 V in an aqueous electrolyte with a stable cycle performance and superior rate capability. The advent of aqueous symmetric sodium‐ion battery with high safety and low cost may provide a solution for large‐scale stationary energy storage.
Funding Information
  • US Department of Energy, Office of Basic Energy Sciences (DE-SC0005397)
  • Robert A. Welch Foundation (F-1066)

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