Selective Synthesis of Lithium Ion-Conductive β-LiVOPO4 Crystals via Glass–Ceramic Processing.
- Resource Type
- Article
- Authors
- Nagamine, Kenta; Honma, Tsuyoshi; Komatsu, Takayuki
- Source
- Journal of the American Ceramic Society. Dec2008, Vol. 91 Issue 12, p3920-3925. 6p. 11 Graphs.
- Subject
- *POTTERY
*INDUSTRIAL chemistry
*IRON metallurgy
*CERAMICS
*DECORATIVE arts
- Language
- ISSN
- 0002-7820
A glass–ceramic processing is applied to a glass with the composition of 33.3Li2O–33.3V2O5–33.3P2O5 (mol%) in order to synthesize lithium ion-conductive β-LiVOPO4 crystals being a potential candidate for cathode materials in lithium ion batteries. It is found that three crystalline phases of α-LiVOPO4, Li2VPO6, and β-LiVOPO4 are formed during the crystallization and α-LiVOPO4 crystals formed initially transform into β-LiVOPO4. The glass–ceramics consisting of almost mainly β-LiVOPO4 crystals are successfully prepared by a heat treatment at around 600°C in air. The glass–ceramics with β-LiVOPO4 crystals show the electrical conductivity of 1.7 × 10−7 S/cm at room temperature and the activation energy of 0.38 eV in the temperature range of 25°–240°C. The structure and electrical properties of the precursor glass are also examined. The present study proposes that the glass–ceramic processing has an advantage for the fabrication of β-LiVOPO4 crystals, because it is difficult to synthesize β-LiVOPO4 crystals using a conventional powder-sintering method. [ABSTRACT FROM AUTHOR]