LiF-doped Li1.3Al0.3Ti1.7(PO4)3 superionic conductors with enhanced ionic conductivity for all-solid-state lithium-ion batteries

• Published in: Ionics 2022, Vol.28 (1), p.73-83
• Main Authors: Miao, Chang, Kou, Zhiyan, Li, Jieqiong, Liu, Chengjin, Chen, Qiyan, Xiang, Yanhong, Xiao, Wei
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Conductors; Cycle ratio; Electrochemistry; Electrolytes; Emission analysis; Energy Storage; Field emission microscopy; Ion currents; Lithium; Lithium fluoride; Lithium-ion batteries; Optical and Electronic Materials; Original Paper; Photoelectrons; Rechargeable batteries; Renewable and Green Energy; Room temperature; Solid electrolytes; Solid state
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-021-04324-2

The Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) solid electrolyte powders doped with LiF are successfully synthesized by spray-drying and calcination methods, and the corresponding physicochemical properties are investigated using X-ray diffraction, a field emission-scanning electron microscope, and an X-ray photoelectron spectroscope. The results show that the LiF-doped LATP (LATP-0.15) solid electrolyte presents excellent performance compared with the pure LATP solid electrolyte when the weight ratio of LiF vs. LATP maintains at 0.15, in which the LATP-0.15 solid electrolyte possesses a higher compacted density of 2.887 g cm −2 and a higher ionic conductivity at room temperature of 1.767 × 10 –4 S cm −1 with lower activation energy of 0.276 eV. Furthermore, the assembled LiCoO 2 /LATP-0.15/Li coin cell delivers a relatively high discharge specific capacity of 136.7 mAh g −1 at 0.1 C after only five active cycles and maintains up to 97.77% of capacity retention ratio after 290 cycles. Those results indicate that the as-prepared LATP-0.15 solid electrolyte may be employed to be a potential candidate in the future all-solid-state lithium-ion batteries.