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Volume 18
Issue 3
10.3390/ma18030609
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Article

Controlling the All-Solid Surface Reaction Between an Li1.3Al0.3Ti1.7(PO4)3 Electrolyte and Anode Through the Insertion of Ag and Al2O3 Nano-Interfacial Layers

by
Gwanhee Song
1,2,
Bojoong Kim
1,
Inkook Hwang
1,
Jiwon Kim
1,
Jinmo Kim
2 and
Chang-Bun Yoon
1,*
1
Department of Advanced Materials Engineering, Tech University of Korea, Siheung-si 15073, Republic of Korea
2
Korea Photonics Technology Institute (KOPTI), Gwangju 61007, Republic of Korea
*
Author to whom correspondence should be addressed.
Materials 2025, 18(3), 609; https://doi.org/10.3390/ma18030609
Submission received: 16 December 2024 / Revised: 9 January 2025 / Accepted: 27 January 2025 / Published: 29 January 2025
(This article belongs to the Special Issue Ionic Liquid Electrolytes for Energy Storage Devices)
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Abstract

Solid-state lithium batteries are considered ideal due to the safety of solid-state electrolytes. The Na superionic conductor-type Li1.3Al0.3Ti1.7(PO4)3 (LATP) is a solid electrolyte with high ionic conductivity, low cost, and stability. However, LATP is reduced upon contact with metallic lithium, leading to lithium dendrite growth on the anode during charging. In this study, LATP was synthesized, and the relationship between crystallinity and ionic conductivity was investigated at different heat treatment temperatures. Optimal sintering conditions and ionic conductivity were analyzed for sintering temperatures from 800 to 1000 °C. To suppress reactions with Li metal, 50 nm thick Ag and 10 nm thick Al2O3 layers were deposited on LATP via DC sputtering and plasma-enhanced atomic layer deposition. The electrochemical stability was tested under three conditions: uncoated LATP, Al2O3-coated LATP, and Ag+Al2O3-coated LATP. The stability improved in the following order: uncoated < Al2O3-coated < Ag+Al2O3-coated. The Al2O3 coating suppressed secondary phase formation by preventing direct contact between LATP and Li, while Ag coating mitigated charge concentration, inhibiting dendrite growth. These findings demonstrate that Ag and Al2O3 nano-layers enhance electrolyte stability, advancing solid-state battery reliability and commercialization.
Keywords: solid electrolyte; Li1+xAlxTi2−x(PO4)3 (LATP); Ag coating; Al2O3 coating; atomic layer deposition solid electrolyte; Li1+xAlxTi2−x(PO4)3 (LATP); Ag coating; Al2O3 coating; atomic layer deposition

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MDPI and ACS Style

Song, G.; Kim, B.; Hwang, I.; Kim, J.; Kim, J.; Yoon, C.-B. Controlling the All-Solid Surface Reaction Between an Li1.3Al0.3Ti1.7(PO4)3 Electrolyte and Anode Through the Insertion of Ag and Al2O3 Nano-Interfacial Layers. Materials 2025, 18, 609. https://doi.org/10.3390/ma18030609

AMA Style

Song G, Kim B, Hwang I, Kim J, Kim J, Yoon C-B. Controlling the All-Solid Surface Reaction Between an Li1.3Al0.3Ti1.7(PO4)3 Electrolyte and Anode Through the Insertion of Ag and Al2O3 Nano-Interfacial Layers. Materials. 2025; 18(3):609. https://doi.org/10.3390/ma18030609

Chicago/Turabian Style

Song, Gwanhee, Bojoong Kim, Inkook Hwang, Jiwon Kim, Jinmo Kim, and Chang-Bun Yoon. 2025. "Controlling the All-Solid Surface Reaction Between an Li1.3Al0.3Ti1.7(PO4)3 Electrolyte and Anode Through the Insertion of Ag and Al2O3 Nano-Interfacial Layers" Materials 18, no. 3: 609. https://doi.org/10.3390/ma18030609

APA Style

Song, G., Kim, B., Hwang, I., Kim, J., Kim, J., & Yoon, C.-B. (2025). Controlling the All-Solid Surface Reaction Between an Li1.3Al0.3Ti1.7(PO4)3 Electrolyte and Anode Through the Insertion of Ag and Al2O3 Nano-Interfacial Layers. Materials, 18(3), 609. https://doi.org/10.3390/ma18030609

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