Crystal Structure and Magnetic Properties of Sodium-Iron Phosphates NaFe0.9Mn0.1PO4 Cathode Material

Crystal Structures and Local Environments of NASICON-Type Na3FeV(PO4)3 and Na4FeV(PO4)3 Positive Electrode Materials for Na-Ion Batteries

“…These results are in rather good agreement with the conclusions already drawn from the XRD data, the two latter samples being much more reduced and thus richer in Na than the first one (sol–gel in Ar). The second contribution attributed to Fe II , labeled as Fe II (2), corresponds to 5–11% of the total Fe amount and is due to the presence of NaFePO 4 , identified by XRD to be present as an impurity in the three samples. , The third contribution attributed to Fe II , labeled Fe II (3), is discussed in the Supporting Information only as not identified yet…”

“…The second contribution attributed to Fe II , labeled as Fe II (2), corresponds to 5−11% of the total Fe amount and is due to the presence of NaFePO 4 , identified by XRD to be present as an impurity in the three samples. 47,48 The third contribution attributed to Fe II , labeled Fe II (3), is discussed in the Supporting Information only as not identified yet Characterization of Na 4 FeV(PO 4 ) 3 Obtained from Na 3 FeV(PO 4 ) 3 through Electrochemical Sodiation. A pure phase of Na 4 FeV(PO 4 ) 3 was prepared by electrochemical sodiation from Na 3 FeV(PO 4 ) 3 .…”

“…The second contribution attributed to Fe II , labelled as Fe II (2), corresponds to 5 % to 11 % of the total Fe amount and is due to the presence of NaFePO 4 , identified by XRD to be present as an impurity in the three samples. 47,48 The third contribution attributed to Fe II , labelled as Fe II (3), is discussed in supplementary information only as not identified yet. Na + /Na but the Fe III/II redox couple is often partially activated.…”