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Journal Article
LaCl3-based sodium halide solid electrolytes with high ionic conductivity for all-solid-state batteries
2024
Overview
To enable high performance of all solid-state batteries, a catholyte should demonstrate high ionic conductivity, good compressibility and oxidative stability. Here, a LaCl
3
-based Na
+
superionic conductor (Na
1
−
x
Zr
x
La
1
−
x
Cl
4
) with high ionic conductivity of 2.9 × 10
−4
S cm
−1
(30 °C), good compressibility and high oxidative potential (3.80 V
vs
. Na
2
Sn) is prepared via solid state reaction combining mechanochemical method. X-ray diffraction reveals a hexagonal structure (
P6
3
/m
) of Na
1
−
x
Zr
x
La
1
−
x
Cl
4
, with Na
+
ions forming a one-dimensional diffusion channel along the
c-
axis. First-principle calculations combining with X-ray absorption fine structure characterization etc. reveal that the ionic conductivity of Na
1
−
x
Zr
x
La
1
−
x
Cl
4
is mainly determined by the size of Na
+
-channels and the Na
+
/La
3+
mixing in the one-dimensional diffusion channels. When applied as a catholyte, the NaCrO
2
||Na
0.7
Zr
0.3
La
0.7
Cl
4
||Na
3
PS
4
||Na
2
Sn all-solid-state batteries demonstrate an initial capacity of 114 mA h g
−1
and 88% retention after 70 cycles at 0.3 C. In addition, a high capacity of 94 mA h g
−1
can be maintained at 1 C current density.
The advancement of sodium halide solid-state electrolytes can propel high-energy-density all-solid-state sodium-ion batteries. Here, the authors present a LaCl
3
-based electrolyte facilitating rapid Na
+
ion conduction along the
c
-axis diffusion channel, ensuring high capacity even at elevated current densities.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
