Densification of a NASICON-Type LATP Electrolyte Sheet by a Cold-Sintering Process

Naoki Hamao; Yuki Yamaguchi; Koichi Hamamoto

doi:10.3390/ma14164737

Densification of a NASICON-Type LATP Electrolyte Sheet by a Cold-Sintering Process

Materials (Basel). 2021 Aug 22;14(16):4737. doi: 10.3390/ma14164737.

Authors

Naoki Hamao¹, Yuki Yamaguchi¹, Koichi Hamamoto¹

Affiliation

¹ Innovative Functional Materials and Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2266-98, Shimo-shidami Anagahora, Moriyama-ku, Nagoya 406-8560, Japan.

Abstract

A NASICON-type Li_1.3Al_0.3Ti_1.7(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.

Keywords: Li-ion conductor; NASICON-type oxide; solid electrolyte.

Grants and funding

JPMJAL1301/Japan Science and Technology Agency