Lanthanum niobate perovskite thin films for Li-ion microbatteries
Abstract
The development of high-performance microbatteries for the Internet of Things (IoT) and smart devices applications requires anode materials that combine a high energy density with fast charge/discharge capabilities. In this study, we report on the synthesis of La–Nb–O thin film anode for Li-ion high-power microbatteries. The thin films were obtained by reactive co-sputtering, which is compatible with miniaturization and microelectronic processes. By adjusting the power applied to La and Nb targets, we controlled the La/Nb atomic ratio and selectively promoted the formation of La1/3NbO3, a vacancy-rich perovskite phase. X-Ray Diffraction (XRD), Raman spectroscopy, and Transmission Electron Microscopy (TEM) observations reveal the formation of a mixed-phase composed of an orthorhombic La1/3NbO3 matrix and LaNbO4 grains for La/Nb ratios slightly above 1/3, while pure LaNbO4 are formed for higher La/Nb ratios. Electrochemical tests demonstrated that LaNbO4 is electrochemically inactive while La1/3NbO3-containing thin films exhibit high areal and gravimetric capacities (up to 73 μAh cm−2 and 203 mAh g−1, respectively) and good rate capability and reversibility (10 μAh.cm−2 in 200 s charge or discharge). A description of Li+ insertion site and occupancy is given based on theoretical and experimental considerations, which suggests that 1.44 Li + could be inserted per La1/3NbO3 unit.
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BibTeX
@article{toure2026lanthanum,
title = {{Lanthanum niobate perovskite thin films for Li-ion microbatteries}},
author = {Oumar Touré and Maryline Le Granvalet and Romain Wernert and Maxime Bodet and Pierre-Emmanuel Petit and Marie-Paule Besland and Thierry Brousse and Jérémy Barbé},
journal = {Journal of Power Sources},
year = {2026},
month = oct,
doi = {10.1016/j.jpowsour.2026.240136},
url = {https://hal.science/hal-05686015v2},
note = {CC BY-NC 4.0},
}
RIS
TY - JOUR
TI - Lanthanum niobate perovskite thin films for Li-ion microbatteries
AU - Oumar Touré
AU - Maryline Le Granvalet
AU - Romain Wernert
AU - Maxime Bodet
AU - Pierre-Emmanuel Petit
AU - Marie-Paule Besland
AU - Thierry Brousse
AU - Jérémy Barbé
PY - 2026
DA - 2026/10/08
JO - Journal of Power Sources
DO - 10.1016/j.jpowsour.2026.240136
UR - https://hal.science/hal-05686015v2
AB - The development of high-performance microbatteries for the Internet of Things (IoT) and smart devices applications requires anode materials that combine a high energy density with fast charge/discharge capabilities. In this study, we report on the synthesis of La–Nb–O thin film anode for Li-ion high-power microbatteries. The thin films were obtained by reactive co-sputtering, which is compatible with miniaturization and microelectronic processes. By adjusting the power applied to La and Nb targets, we controlled the La/Nb atomic ratio and selectively promoted the formation of La1/3NbO3, a vacancy-rich perovskite phase. X-Ray Diffraction (XRD), Raman spectroscopy, and Transmission Electron Microscopy (TEM) observations reveal the formation of a mixed-phase composed of an orthorhombic La1/3NbO3 matrix and LaNbO4 grains for La/Nb ratios slightly above 1/3, while pure LaNbO4 are formed for higher La/Nb ratios. Electrochemical tests demonstrated that LaNbO4 is electrochemically inactive while La1/3NbO3-containing thin films exhibit high areal and gravimetric capacities (up to 73 μAh cm−2 and 203 mAh g−1, respectively) and good rate capability and reversibility (10 μAh.cm−2 in 200 s charge or discharge). A description of Li+ insertion site and occupancy is given based on theoretical and experimental considerations, which suggests that 1.44 Li + could be inserted per La1/3NbO3 unit.
SN - 0378-7753
SN - 1873-2755
ER -