A facile and scalable process to synthesize flexible lithium ion conductive glass-ceramic fibers

• Published in: RSC advances Vol. 9; no. 8; pp. 4157 - 4161
• Main Authors: He, Kun, Xie, Pu, Zu, Chengkui, Wang, Yanhang, Li, Baoying, Han, Bin, Rong, Min Zhi, Zhang, Ming Qiu
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 31.01.2019; The Royal Society of Chemistry
• Subjects: ambient temperature; Annealing; Batteries; brittleness; Ceramic fibers; Chemical synthesis; Chemistry; Crystallization; Electrolytes; glass; Glass ceramics; Ion currents; ionic liquids; Ions; Lithium; lithium batteries; Lithium ions; Melt spinning; melting; Molten salt electrolytes; Solid electrolytes; Thermal conductivity
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/c8ra08401g

Solid-state electrolytes have emerged as a promising alternative to existing liquid electrolytes for next-generation flexible Li metal batteries with enhanced safety and stability. Nevertheless, the brittleness and inferior room temperature conductivity are major obstacles for practical applications. Herein, for the first time, we have fabricated a flexible lithium ion conductive glass-ceramic fiber by using a melt-spun homogeneous NASICON-type structured Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) glass melt and annealed at 825 °C. The annealed samples exhibited a higher lithium ion conductivity than the air-quenched sample due to the presence of a well-crystallized crystal grain in the annealed sample. Meanwhile, the ionic conductivity has shown an inverse relationship with the diameter of annealed LAGP glass-ceramic fibers. The results revealed that the annealed glass-ceramic fiber, with a diameter of 10 μm, resulted in lithium ion conductivity of 8.8 × 10 3 S cm −1 at room temperature. A flexible lithium ion conductive Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 glass-ceramic fiber was prepared by melt-spun method.