Publication date: 15th December 2025
Lithium phosphate NASICON-type electrolytes are promising candidates for enabling high-energy-density and safe batteries. Moreover, their stability in air and moisture, combined with a composition that relies on few critical raw materials, makes them excellent candidates for practical implementation. However, the interfacial instability between the NASICON-type solid electrolytes and the Li metal anode remains a critical bottleneck for the practical deployment of all-solid-state lithium batteries. When put in contact, the highly reductive potential of Li metal reduces the transition metals of the electrolyte. This process leads to the formation of a mixed conducting interphase (MCI), accompanied by amorphization, electrolyte decomposition, and mechanical pulverization, causing rapid capacity fade after only a few cycles. To mitigate this issue, we deposited a 200 nm protective thin film of metallic titanium (Ti) onto the Li1.5Al0.5Ge1.5(PO4)3 (LAGP) surface using magnetron DC sputtering. This interfacial modification promotes the in-situ formation of lithium titanate species (LixTiyOz), which stabilize the interface and extend the operational lifespan of LAGP-based cells. In this presentation, we will highlight the enhanced electrochemical performance of these surface-engineered cells and provide structural characterization by operando Raman and post-mortem analysis to elucidate the mechanisms underlying the observed improvements.
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