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A study of the electrochemical behavior of LiMnPO 4 prepared by RAPET method in different aqueous electrolytes using cyclic voltammetry (CV), galvanostatic charge-discharge experiments, and electrochemical impedance spectroscopy is reported. CV peak current is proportional to the square root of scan rate under 0.2 mV s −1 . The system satisfied the required conditions for a reversible system with a resistive behavior. LiMnPO 4 was found to undergo proton insertion at lower concentrations of electrolyte. At higher concentrations or saturated solutions of electrolytes, lithium insertion/de-insertion becomes the main reaction though the effect of proton insertion/de-insertion reaction cannot be ignored. Electrochemical insertion/deinsertion of lithium in LiMnPO 4 was studied using EIS technique. The kinetic parameter, charge transfer resistance (R ct ), obtained by simulating the experimental impedance data with an equivalent circuit showed a minimum at the potential close to the CV peak potential. The cell LiTi 2 (PO 4 ) 3 /5 MLiNO 3 /LiMnPO 4 delivers a discharge capacity of 84 mAh g −1 in the first cycle at an applied current of 0.2 mA cm −2 and it retains its initial capacity over 50 cycles with good rate capability.

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A series of polypyrrole (PPy)-LiNi