Issue 21, 2019

Preparation of thin solid electrolyte by hot-pressing and diamond wire slicing

Abstract

The thickness of a solid electrolyte influences the performance of all-solid-state batteries due to increased impedance with a thick electrolyte. Thin solid electrolytes are favourable to improve the performance of all-solid-state batteries due to the short Li ion diffusion path and small volume of the solid electrolytes. Therefore, the preparation of thin solid electrolyte is one of the key process techniques for development of all-solid-state batteries. In this study, thin Li1.5Ge1.5Al0.5(PO4)3 solid electrolyte with a Na super ion conductor structure is prepared by diamond wire slicing. The Li1.5Ge1.5Al0.5(PO4)3 solid electrolyte is prepared by melt-quenching followed by crystallization at 800 °C for 8 h, after which the crystallized Li1.5Ge1.5Al0.5(PO4)3 rod is subjected to wire slicing. Thin Li1.5Ge1.5Al0.5(PO4)3 with a thickness of 200 μm is obtained. The crystal structure and cross-sectional morphology are not affected by the slicing. The total Li conductivity of the thin Li1.5Ge1.5Al0.5(PO4)3 and activation energy are 3.3 × 10−4 S cm−1 and 0.32 eV, respectively. The thickness and total conductivity are comparable to those of Li1.5Ge1.5Al0.5(PO4)3 prepared by the tape-casting method which needs several steps to prepare Li1.5Ge1.5Al0.5(PO4)3 tape-sheet and high temperature and a long sintering process. The ionic transference number of the thin Li1.5Ge1.5Al0.5(PO4)3 is 0.999. The diamond wire slicing is a useful method to prepare thin solid electrolytes.

Graphical abstract: Preparation of thin solid electrolyte by hot-pressing and diamond wire slicing

Article information

Article type
Paper
Submitted
26 jan 2019
Accepted
05 apr 2019
First published
15 apr 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 11670-11675

Preparation of thin solid electrolyte by hot-pressing and diamond wire slicing

M. Kotobuki, H. Lei, Y. Chen, S. Song, C. Xu, N. Hu, J. Molenda and L. Lu, RSC Adv., 2019, 9, 11670 DOI: 10.1039/C9RA00711C

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