TY - JOUR

T1 - La-Al-O functional nanocoating to increase Li1+xAlxGe2-x(PO4)3/Li metal interface stability in solid-state battery

AU - Vishniakov, Pavel

AU - Nazarov, Denis

AU - Chernyavsky, Vladislav

AU - Olkhovskii, Denis

AU - Ezhov, Ilya

AU - Markov, Viktor

AU - Lebedeva, Maria

AU - Shengjie, Peng

AU - Nemov, Sergey

AU - Maximov, Maxim

PY - 2025/3/1

Y1 - 2025/3/1

N2 - Solid-state battery with lithium anode and NASICON-type electrolyte, particularly. Li1+xAlxGe2-x(PO4)3 (LAGP), is promising safety rechargeable energy source. However, the Li|LAGP system exhibits a rapid decline in performance and a limited operational lifespan. One potential avenue for enhancing operational lifespan is the introduction of functional nanocoating at the anode/electrolyte interface. The present study considers the La-Al-O at varying Al:La ratios obtained by atomic layer deposition (ALD) as the functional coating, where Al-O was used to increase the interface stability and La-O to vary conductivity and electrochemical stability of the coating. It was shown that mixed oxide LaAlO3–Al2O3 (LaxAl2-xO3, x < 1) is formed at low La contents, which lead to stable operation without increasing overvoltage for more than 1000 h. Moreover, the introduction of 1 at% La results in an interface resistance decrease compared to Al2O3 coating and uncoated LAGP. It was also shown that high La content decreases the initial interface resistance, but affects the composition uniformity due to the lanthanum carbonate appearance, which leads to LAGP degradation at currents greater than 0.2 mA/cm2. Therefore, it is possible to extend the cycling life and stability of the LAGP solid electrolyte in contact with lithium by introducing a LaAlO3–Al2O3 functional coating.

AB - Solid-state battery with lithium anode and NASICON-type electrolyte, particularly. Li1+xAlxGe2-x(PO4)3 (LAGP), is promising safety rechargeable energy source. However, the Li|LAGP system exhibits a rapid decline in performance and a limited operational lifespan. One potential avenue for enhancing operational lifespan is the introduction of functional nanocoating at the anode/electrolyte interface. The present study considers the La-Al-O at varying Al:La ratios obtained by atomic layer deposition (ALD) as the functional coating, where Al-O was used to increase the interface stability and La-O to vary conductivity and electrochemical stability of the coating. It was shown that mixed oxide LaAlO3–Al2O3 (LaxAl2-xO3, x < 1) is formed at low La contents, which lead to stable operation without increasing overvoltage for more than 1000 h. Moreover, the introduction of 1 at% La results in an interface resistance decrease compared to Al2O3 coating and uncoated LAGP. It was also shown that high La content decreases the initial interface resistance, but affects the composition uniformity due to the lanthanum carbonate appearance, which leads to LAGP degradation at currents greater than 0.2 mA/cm2. Therefore, it is possible to extend the cycling life and stability of the LAGP solid electrolyte in contact with lithium by introducing a LaAlO3–Al2O3 functional coating.

KW - Atomic layer deposition

KW - Functional coating

KW - LAGP

KW - Li anode

KW - Solid-state battery

KW - Thin films

UR - https://www.sciencedirect.com/science/article/abs/pii/S0169433224025479?via%3Dihub

UR - https://www.mendeley.com/catalogue/e8e77e66-323e-35b7-a5a3-a59fab5ce3cc/

U2 - 10.1016/j.apsusc.2024.161831

DO - 10.1016/j.apsusc.2024.161831

M3 - Article

VL - 684

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

M1 - 161831

ER -