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Selective Synthesis of Lithium Ion‐Conductive β‐LiVOPO 4 Crystals via Glass–Ceramic Processing
Author(s) -
Nagamine Kenta,
Honma Tsuyoshi,
Komatsu Takayuki
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02812.x
Subject(s) - materials science , lithium (medication) , crystallization , ceramic , sintering , fabrication , glass ceramic , chemical engineering , cathode , electrical conductor , mineralogy , composite material , chemistry , medicine , alternative medicine , pathology , engineering , endocrinology
A glass–ceramic processing is applied to a glass with the composition of 33.3Li 2 O–33.3V 2 O 5 –33.3P 2 O 5 (mol%) in order to synthesize lithium ion‐conductive β‐LiVOPO 4 crystals being a potential candidate for cathode materials in lithium ion batteries. It is found that three crystalline phases of α‐LiVOPO 4 , Li 2 VPO 6 , and β‐LiVOPO 4 are formed during the crystallization and α‐LiVOPO 4 crystals formed initially transform into β‐LiVOPO 4 . The glass–ceramics consisting of almost mainly β‐LiVOPO 4 crystals are successfully prepared by a heat treatment at around 600°C in air. The glass–ceramics with β‐LiVOPO 4 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‐LiVOPO 4 crystals, because it is difficult to synthesize β‐LiVOPO 4 crystals using a conventional powder‐sintering method.