Abstract
A NASICON-type Li1.3Al0.3Ti1.7(PO4)3 (LATP) electrolyte sheet for all-solid-state batteries was fabricated by a cold sintering process (CSP). The microstructure of the LATP sheet was controlled to improve the wettability which is an essential factor in CSP. The porous sheets of LATP were prepared by calcination the green sheets to remove the organic components and form the porous structure. By the CSP using the porous sheets, the densification of grain boundary was observed and further densified with increasing reaction time. The total conductivity of the prepared LATP sheet was improved from 3.0 × 10−6 S/cm to 3.0 × 10−4 S/cm due to the formation of necks between the particles at the grain boundary.
Highlights
All-solid-state batteries that use oxides as solid electrolytes are expected to be among high-performance next-generation energy devices
Li1.3 Al0.3 Ti1.7 (PO4 )3 (LATP) is a glass-ceramic material with a lower glass transition (650 ◦ C) and crystallization temperature (690 ◦ C) than those of other solid electrolyte materials, a temperature of about 1150 ◦ C is still required for its densification without a sintering aid [11]
The cold sintering process (CSP) has attracted much attention as a technique to improve the density of ceramics at low temperatures [12,13,14]
Summary
All-solid-state batteries that use oxides as solid electrolytes are expected to be among high-performance next-generation energy devices. Liu et al investigated the densification of LATP pellets by CSP and reported that the density of LATP electrolytes is strongly related to the sintering process, solvent addition, and applied stress [15]. In magnetic material systems, Lowum et al reported the densification of BaFe12 O19 by CSP and investigated the relationship between the amount of solution used in CSP and the sintered material’s microstructure [17]. They observed densification of the BaFe12 O19 particles when an optimal amount of water was applied.
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