Si-doped NASICON-type Li1.4Al0.4Ti1.6(PO4)3 solid electrolytes for enhanced stability and performance of Li-CO2 batteries

Authors
Yu, DohyeonNa, DanKim, HwanSon, Dong IckLee, David D.Seo, Inseok
Issue Date
2025-01
Publisher
Elsevier BV
Citation
Journal of Alloys and Compounds, v.1010
Abstract
Li-CO2 batteries (LCBs) have attracted significant research interest owing to their potential as energy storage devices and their contribution to carbon neutrality. In this study, we synthesized a solid electrolyte using Si- doped Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 (LASTP), by incorporating Si into the NASICON-structured LATP. Through Si doping, P in the tetrahedral PO4 units within the NASICON framework is substituted with Si, and bridging oxygen bonds are formed after high-temperature heat treatment The LASTP powder synthesized via a solution- based method exhibited uniform particle size and composition, and the resulting pellet achieved high densification and the formation of interconnected structures. The pellet exhibited an ionic conductivity of approximately 8.8 x 10-4 S/cm at 25 degrees C. The LCB utilizing LASTP demonstrated a maximum discharge capacity of 23,887 mAh/g and successfully operated for 200 cycles at a current density of 100 mA/g with a cut-off capacity of 500 mAh/g. The post-cycling analysis of the cathode confirmed the reversible reactions of the LCB. Additionally, comparative post-cycling XPS analysis of LATP and LASTP revealed that Si doping in LASTP mitigated the reduction of Ti4+ to Ti3+, thereby enhancing the chemical stability of the solid electrolyte. Also, the structural stability of the solid electrolyte was enhanced owing to the formation of new bonds, surpassing the cycle performance and full-depth capacity of LCBs using conventional solid electrolytes. The introduction of structurally and chemically stabilized LASTP enabled the realization of long-lasting, high-capacity LCBs.
Keywords
LI+ ION CONDUCTION; LITHIUM; BEHAVIOR; Inorganic solid electrolyte; NASICON; Si doped; Li-CO 2 battery
ISSN
0925-8388
URI
https://pubs.kist.re.kr/handle/201004/151633
DOI
10.1016/j.jallcom.2024.177722
Appears in Collections:
KIST Article > Others
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML

qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE