Electrochemical Properties of NaTi2(PO4)3 Anode for Rechargeable Aqueous Sodium-Ion Batteries

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The charge/discharge characteristics of NaTi2(PO4)3 as an anode active material for aqueous sodium-ion battery containing 2 M Na2SO4 aqueous electrolyte were examined. Cyclic voltammograms, galvanostatic discharge/charge and XRD data of the material indicated that sodium can be reversibly intercalated into NASICON-type NaTi2(PO4)3 without serious degradation of the host structure. The best reversible capacity at rate of 2.0 mA cm−2 was 93% of the theoretical capacity of 133 mAh g−1 and the plateau voltage was 2.1 V versus Na/Na+.

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