Synthesis, Structures, and Electrochemical Characteristics of Pyrophosphates

Yasushi Uebou, Shigeto Okada, Minato Egashira, Jun-ichi Yamaki

Research output: Contribution to journalArticle


We synthesized the two pyrophosphates LiVP_2O_7 and TiP_2O_7 by a solid state reaction, and the cathode properties of lithium secondary batteries were investigated. The structures were characterized by powder X-ray Rietveld refinement. Lithium cells using LiVP_2O_7 and TiP_2O_7 cathodes showed that approximately 0.5 Li per unit could be reversibly deintercalated from LiVP_2O_7 at 4.1V vs. Li/Li^+, 0.8 Li per unit could be reversibly intercalated into TiP_2O_7 at 2.6V vs. Li/Li^+. The redox potentials 4.1V of LiVP_2O_7 and 2.6V of TiP_2O_7 were higher than that of transition metal oxides such as VO_2 and TiO_2.
Original languageEnglish
Pages (from-to)57-61
Number of pages5
JournalThe Reports of Institute of Advanced Material Study,Kyushu University
Issue number1
Publication statusPublished - 2001


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