A High‐Capacity, Low‐Cost Layered Sodium Manganese Oxide Material as Cathode for Sodium‐Ion Batteries

Abstract

A layered sodium manganese oxide material (NaMn3 O5 ) is introduced as a novel cathode materials for sodium-ion batteries. Structural characterizations reveal a typical Birnessite structure with lamellar stacking of the synthetic nanosheets. Electrochemical tests reveal a particularly large discharge capacity of 219 mAh g(-1) in the voltage rang of 1.5-4.7 V vs. Na/Na(+) . With an average potential of 2.75 V versus sodium metal, layered NaMn3 O5 exhibits a high energy density of 602 Wh kg(-1) , and also presents good rate capability. Furthermore, the diffusion coefficient of sodium ions in the layered NaMn3 O5 electrode is investigated by using the galvanostatic intermittent titration technique. The results greatly contribute to the development of room-temperature sodium-ion batteries based on earth-abundant elements.

Sodium vanadium titanium phosphate electrode for symmetric sodium-ion batteries with high power and long lifespan

“…Fitting the linear relationship between the peak currents and the square root of the scanning rate for A and C peaks (Fig. 3c) yields comparable Na + ion apparent diffusion coefficient D Na+ values (2.12 × 10 −10 and 2.19 × 10 −10  cm 2  s −1 for A and C, respectively) to those for the NASICON-structured Na 3 V 2 (PO 4 ) 3 /C nanocomposites927 and several layered cathode materials2829 used in SIBs, according to the Randles−Sevick equation9:…”

Na + /vacancy disordering promises high-rate Na-ion batteries

“…To verify this hypothesis, the apparent diffusion coefficients of Na + of the two compounds were investigated by GITT ( 40 , 41 ). The equilibrium voltage of P2-NaNMT shows a continuous change, confirming the single-phase reaction process during Na + (de)intercalation between 2.5 and 4.15 V (fig.…”

A new layered sodium molybdenum oxide anode for full intercalation-type sodium-ion batteries

“…This implies that the diffusion of Na + in the Na x MoO 2 become increasingly difficult, which -7.9×10 -13 cm 2 /s, which is considerably higher than other sodium-ion electrode material, indicating the potential for high rate application. 26,27 The assembling the full cell is an effective measure to investigate the application prospects of the electrode materials. [28][29][30][31] Thus a sodium-ion full cell is fabricated with the Na 0.3 MoO 2 as the anode and Na 0.8 Ni 0.4 Ti 0.6 O 2 as the cathode as shown in Figure 4a.…”