Figure 4

(A) Cyclic voltammograms at a scan rate of 5 mV s−1 and (B) corresponding Nyquist plots of electrochemical impedance spectroscopy (EIS) of synthesized olivine samples: (a) LiFePO4; (b) LiMn0.1Fe0.9PO4; (c) LiMn0.2Fe0.8PO4 and (d) LiMn0.3Fe0.7PO4. Experimental conditions are described in the text. These figures have been presented using OriginLab Software, ver.6.0 (https://www.originlab.com).