Co-Free P2–Na&lt;sub&gt;0.67&lt;/sub&gt;Mn&lt;sub&gt;0.6&lt;/sub&gt;Fe&lt;sub&gt;0.25&lt;/sub&gt;Al&lt;sub&gt;0.15&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt; as promising cathode material for sodium-ion batteries

Marelli, Elena; Villevieille, Claire; Park, Sunkyu; Hérault, Nelly; Marino, Cyril

doi:10.1021/acsaem.8b01015

Co-Free P2–Na_0.67Mn_0.6Fe_0.25Al_0.15O₂ as promising cathode material for sodium-ion batteries

Marelli E, Villevieille C, Park S, Hérault N & Marino C

Citation

Marelli, E., Villevieille, C., Park, S., Hérault, N., & Marino, C. (2018). Co-Free P2–Na_0.67Mn_0.6Fe_0.25Al_0.15O₂ as promising cathode material for sodium-ion batteries. ACS Applied Energy Materials, 1(11), 5960-5967. https://doi.org/10.1021/acsaem.8b01015

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:5470

P2–Na_0.67Mn_0.6Fe_0.25Al_0.15O₂ (NaMFA) was developed as a cheaper and less-toxic cathode material for sodium-ion batteries than the Co analogous, P2–Na_0.67Mn_0.6Fe_0.25Co_0.15O₂ (NaMFC). Despite cobalt being considered to stabilize layered structures upon cycling, NaMFA proved to have not only a higher specific charge 163 mAh g^–1 compared to 141 mAh g^–1 at a 0.1 C rate but also a better cycling stability and rate capability than NaMFC. The structural transitions occurring during sodiation/desodiation in the layered frames were characterized by operando X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) analyses. Aluminum was found to stabilize the P2-phase and favor the Mn reduction on discharge, increasing the amount of Na atoms reintercalated in the structure.