Synthesis and Characterization of the New Li1+ xAl1+ xSi1- xO4 (x = 0-0.25) Solid Electrolyte for Lithium-Ion Batteries

Je-Gwang Ryu; Ramkumar Balasubramaniam; Vanchiappan Aravindan; Sangho Park; Sung June Cho; Yun-Sung Lee

doi:10.1021/acsami.3c15221

Synthesis and Characterization of the New Li_{1+ x}Al_{1+ x}Si_{1- x}O₄ (x = 0-0.25) Solid Electrolyte for Lithium-Ion Batteries

ACS Appl Mater Interfaces. 2024 Jan 10;16(1):761-771. doi: 10.1021/acsami.3c15221. Epub 2023 Dec 18.

Authors

Je-Gwang Ryu¹, Ramkumar Balasubramaniam¹, Vanchiappan Aravindan², Sangho Park³, Sung June Cho¹, Yun-Sung Lee¹

Affiliations

¹ Faculty of Chemical Engineering, Chonnam National University, Gwangju 500 757, Republic of Korea.
² Department of Chemistry, Indian Institute of Science Education and Research (IISER), Tirupati 517507, India.
³ Department of Battery Engineering, Dongshin University, Dongshindae-gil 34-22, Naju-si, Jeollanam-do 58245, Republic of Korea.

PMID: 38109301
DOI: 10.1021/acsami.3c15221

Abstract

A systematic study was performed to investigate the effect of the sintering temperature, sintering duration, and aluminum doping on the crystalline structure and ionic conductivity of the Li_1+xAl_1+xSi_1-xO₄ (LASO; x = 0-0.25) solid electrolyte. There was a strong indication that an increase in the sintering temperature and sintering time increased the ionic conductivity of the electrolyte. In particular, the doping concentration and composition ratio (Li_1+xAl_1+xSi_1-xO₄; x = 0-0.25) were found to be crucial factors for achieving high ionic conductivity. The sintering time of 18 h and lithium concentration influenced the lattice parameters of the LASO electrolyte, resulting in a significant improvement in ionic conductivity from 2.11 × 10^-6 (for pristine LASO) to 1.07 × 10^-5 S cm^-1. An increase in the lithium concentration affected the stoichiometry, and it facilitated a smoother Li-ion transfer process since lithium served as an ion-conducting bridge between LASO grains.

Keywords: doping effect; lattice parameter; lithium ionic conductivity; sintering temperature; solid electrolyte.