Vanadyl phosphates of VOPO4 as a cathode of Li-ion rechargeable batteries

Bustam M. Azmi, Tatsumi Ishihara, Hiroyasu Nishiguchi, Yusaku Takita

研究成果: Contribution to journalConference article査読

63 被引用数 (Scopus)


Seven phases of VOPO4 were synthesized and their Li intercalation properties were investigated. Li can be reversibly intercalated into all phases of VOPO4 and potential plateaus for Li intercalation and de-intercalation exist at 3.7 and 3.9 V, respectively, except for the β- and ε-phases. β- and ε-phases of VOPO4 exhibit slightly higher flat potentials of 3.9 and 4.1 V. The capacity for Li intercalation is strongly affected by the crystal structure of VOPO4 and the Li intercalation capacity increases with increasing average valence of V. Among the VOPO4 crystal phases, it was found that the δ-phase exhibits the largest reversible capacity of ca. 130 mAh/g. The capacity for Li de-intercalation in δ-phase VOPO4 hardly decreased over 35 charge and discharge cycles. On the other hand, the Li intercalation capacity in δ-phase VOPO4 decreased with increasing current density for charge and discharge and temperature. However, even at a current density of 0.4 mA/cm2, corresponding to C/5, fairly large capacity of ca. 60 mAh/g was sustained, and at a operating temperature or 323 K, a capacity of 110 mAh/g was exhibited at 0.04 mA/cm2.

ジャーナルJournal of Power Sources
出版ステータス出版済み - 6 1 2003
イベントSelected Papers Presented at the 11th IMLB - Monterey, CA, 米国
継続期間: 6 22 20026 28 2002

All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 物理化学および理論化学
  • 電子工学および電気工学


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