Enhancing ionic conductivity and interfacial stability of perovskite-type LLTO solid electrolytes via synergistic A-site Sr substitution and polymer layer engineering for safer lithium-ion batteries.
- 1Solid State Ionics Lab, Department of Physics, SRM University AP Amaravati 522240 Andhra Pradesh India [email protected] [email protected] +91-0863-2343111 +91-0863-2343000.
- 2SRM-Amara Raja Center for Energy Storage Devices, SRM University AP Amaravati 522240 Andhra Pradesh India.
- 3Department of Chemistry, SRM University AP Amaravati 522240 Andhra Pradesh India.
Abstract
The development of safe, high-performance solid electrolytes is critical for advancing next-generation solid-state lithium-ion batteries (SSLIBs). Perovskite-type Li0.33La0.56TiO₃ (LLTO) has emerged as a promising solid electrolyte for SSLIBs owing to its high thermal and mechanical stability; however, its moderate ionic conductivity and interfacial instability with lithium metal hinder its practical application. In this work, the ionic conductivity of LLTO was enhanced through A-site doping via partial substitution with Sr using two different Sr precursors (SrCO₃ and SrF₂). Sr-doped LLTO solid electrolytes were synthesised using a solid-state reaction method. Structural and microstructural analyses confirmed the successful incorporation of Sr into LLTO without the formation of secondary phases. Ionic conductivity measurements revealed that Sr-doped LLTO synthesised using the SrF₂ precursor (LLTO-SrF₂) exhibited higher ionic conductivity than that synthesised using the SrCO₃ precursor (LLTO-SrCO₃). The enhanced conductivity of LLTO-SrF₂ relative to LLTO-SrCO₃ and pristine LLTO was attributed to differences in their lattice parameters, densities, and microstructures. LLTO-SrF₂ exhibited a high room-temperature bulk ionic conductivity of 2.86 × 10⁻³ S cm⁻¹. To further address the interfacial instability with lithium metal, a PEO-based protective layer (PL) was placed around the LLTO-SrF₂ pellet ((LLTO-SrF₂)PL) to suppress parasitic reactions between Ti⁴⁺ and lithium metal while improving interfacial contact. The symmetric cell (Li/(LLTO-SrF₂)PL/Li) exhibited stable galvanostatic cycling for over 540 h with highly reversible and symmetric lithium plating/stripping behaviour. These results highlight the synergistic effect of Sr substitution in enhancing ionic conductivity and polymer layer engineering in improving electrochemical stability against lithium metal.
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BibTeX
@article{alam2026enhancing,
title = {{Enhancing ionic conductivity and interfacial stability of perovskite-type LLTO solid electrolytes via synergistic A-site Sr substitution and polymer layer engineering for safer lithium-ion batteries.}},
author = {Tausif Alam and Lakshmi Hrushita Korlapati and Sumit Khatua and K Ramakrushna Achary and L N Patro},
journal = {RSC advances},
year = {2026},
month = oct,
doi = {10.1039/d6ra06621f},
url = {https://europepmc.org/article/MED/42836031},
note = {CC BY-NC},
}
RIS
TY - JOUR
TI - Enhancing ionic conductivity and interfacial stability of perovskite-type LLTO solid electrolytes via synergistic A-site Sr substitution and polymer layer engineering for safer lithium-ion batteries.
AU - Tausif Alam
AU - Lakshmi Hrushita Korlapati
AU - Sumit Khatua
AU - K Ramakrushna Achary
AU - L N Patro
PY - 2026
DA - 2026/10/05
JO - RSC advances
DO - 10.1039/d6ra06621f
UR - https://europepmc.org/article/MED/42836031
AB - The development of safe, high-performance solid electrolytes is critical for advancing next-generation solid-state lithium-ion batteries (SSLIBs). Perovskite-type Li0.33La0.56TiO₃ (LLTO) has emerged as a promising solid electrolyte for SSLIBs owing to its high thermal and mechanical stability; however, its moderate ionic conductivity and interfacial instability with lithium metal hinder its practical application. In this work, the ionic conductivity of LLTO was enhanced through A-site doping via partial substitution with Sr using two different Sr precursors (SrCO₃ and SrF₂). Sr-doped LLTO solid electrolytes were synthesised using a solid-state reaction method. Structural and microstructural analyses confirmed the successful incorporation of Sr into LLTO without the formation of secondary phases. Ionic conductivity measurements revealed that Sr-doped LLTO synthesised using the SrF₂ precursor (LLTO-SrF₂) exhibited higher ionic conductivity than that synthesised using the SrCO₃ precursor (LLTO-SrCO₃). The enhanced conductivity of LLTO-SrF₂ relative to LLTO-SrCO₃ and pristine LLTO was attributed to differences in their lattice parameters, densities, and microstructures. LLTO-SrF₂ exhibited a high room-temperature bulk ionic conductivity of 2.86 × 10⁻³ S cm⁻¹. To further address the interfacial instability with lithium metal, a PEO-based protective layer (PL) was placed around the LLTO-SrF₂ pellet ((LLTO-SrF₂)PL) to suppress parasitic reactions between Ti⁴⁺ and lithium metal while improving interfacial contact. The symmetric cell (Li/(LLTO-SrF₂)PL/Li) exhibited stable galvanostatic cycling for over 540 h with highly reversible and symmetric lithium plating/stripping behaviour. These results highlight the synergistic effect of Sr substitution in enhancing ionic conductivity and polymer layer engineering in improving electrochemical stability against lithium metal.
SN - 2046-2069
ER -