Electrochemical insertion of lithium and sodium into (MoO2)2P2O7

• Published in: Journal of power sources Vol. 115; no. 1; pp. 119 - 124
• Main Authors: UEBOU, Yasushi, OKADA, Shigeto, YAMAKI, Jun-Ichi
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier Sequoia 27.03.2003
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Intercalation compound; Sodium phosphate; Sodium; Cathode; Lithium phosphate; Insertion; Lithium batteries; Secondary cell; Phosphate: Lithium; Electrode material; Current density; X ray diffraction
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/S0378-7753(02)00648-1

Insertion of lithium and sodium into phosphate (MoO2)2P2O7 was investigated electrochemically to determine the usefulness as a possible cathode for ion-transfer secondary batteries. Specific charges of up to 250 mAhg-1 were obtained for A/(MoO2)2P2O7(A:Li,Na) cells with liquid organic electrolytes in the first reduction half-cycle at room temperature. Intercalation processes under constant current densities of 0.2 mA cm-2 were reversible within the range of composition 0.85 < x < 4.0 for lithium and 0.5 < x < 3.1 for sodium in Ax(MoO2)2P2O7(A:Li,Na), respectively. Structural changes induced by lithium or sodium intercalation were followed by ex situ X-ray diffraction measurements, and the phase change from the crystal to the amorphous was observed in both cases.