Materials Chemistry and Physics 257 (2021) 123848
Available online 23 September 2020
0254-0584/© 2020 Elsevier B.V. All rights reserved.
Fast synthesis and sintering of Li
5
La
3
Nb
2
O
12
garnet ceramic
G.M.M.M. Lustosa
a, *
, M.G.S. Franchetti
a
, A. de Souza
b
, F.A.B. Goulart
a
, L. da Conceiç˜ ao
a
, M.A.
C. Berton
a
a
Senai Innovation Institute of Electrochemistry, Curitiba, PR, Brazil
b
Eletran Batteries, Apucarana, PR, Brazil
G R A P H I C A L ABSTRACT
A R T I C L E INFO
Keywords:
Spray pyrolysis
Nanostructured semiconductor
Ceramic electrolyte
Spark plasma sintering
Lithium garnet
ABSTRACT
In this research, we present a novel synthesis route to obtain a Li
5
La
3
Nb
2
O
12
Garnet structure to be used as solid
state electrolyte for Next Generation Li-Battery. The Lithium-based ceramic powder was synthesized by Spray
Pyrolysis at 800
◦
C and it was identifed the perovskite structure of LiLa
2
NbO
6
by X-Ray Diffraction charac-
terization. The Scanning Electronic Microscopy showed spherical nanostructured particles with average diameter
under 600 nm. After Spark Plasma Sintering the obtained pellets had ~89% of density and XRD analysis indicate
its Li
5
La
3
Nb
2
O
12
Garnet structure after sintering temperatures higher than 900
◦
C/30 min with a heating rate of
50
◦
C/min, without any pre or post heat treatment. The Li-conductivity measured by impedance analysis for this
pellet was 10
6
S/cm. This new kind of Field Assisted Fast Sintering avoids grain growth, which favors the
lithionic conduction and potentiates the use of this material as ceramic electrolytes.
1. Introduction
Energy storage system as Lithium-ion batteries (LIBs) have recently
attracted massive scientifc interest after being proven to have higher
energy density that can be used in many applications from portable
devices (cell phones, laptops) to electric vehicles. The use of ceramic
based solid electrolytes has given rise to new types of batteries that have
improved their safety of current devices [1–5]. Several lithium-based
oxides are been investigated nowadays for being promising to use in
Li-batteries due to the lithium conductivity (~10
6
– 10
4
S cm
1
),
electrochemical and thermal stability and ease of preparation.
Li
7
La
3
Zr
2
O
12
(LLZ), Li
5
La
3
Nb
2
O
12
(LLN), Li
5
La
3
Ta
2
O
12
(LLT), and others
[6–8] are among the garnet materials studied that will increase the load
capacity, cycle performance and lifetime of energy storage devices.
* Corresponding author.
E-mail address: glauco.morandi@gmail.com (G.M.M.M. Lustosa).
Contents lists available at ScienceDirect
Materials Chemistry and Physics
journal homepage: www.elsevier.com/locate/matchemphys
https://doi.org/10.1016/j.matchemphys.2020.123848
Received 24 July 2020; Received in revised form 11 September 2020; Accepted 17 September 2020