Reinforced Poly(Ionic Liquid)-in-Salt Electrolytes for Highly Stable Solid-State Lithium Metal Batteries
Solid-state polymer electrolytes (SPEs) are promising for high-safety, high-energy-density lithium metal batteries, but their adoption is limited by low room-temperature ionic conductivity and insufficient mechanical robustness. This study reports an improved SPE architecture consisting of a three-dimensional (3D) polyacrylonitrile (PAN)–Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) fibrous skeleton infused with a polymer electrolyte ionic liquid (PIL), which promotes lithium-salt dissociation, accelerates Li + transport, and enhances mechanical strength. The resulting SPE achieves an ionic conductivity of up to 0.51 mS cm −1 . Li|Li symmetric cells using a 40-µm-thick SPE cycle stably for 2500 h at 0.2 mA cm −2 with a low overpotential of 30 mV. In Li|LiFePO 4 (LFP) full cells, the electrolyte enables 86.8% capacity retention after 1000 cycles at 0.5 C and maintains stable operation at 130 °C. Flexible pouch-cell tests further confirm improved safety and durability under harsh conditions, highlighting the potential of this SPE design for high-voltage lithium metal batteries.
Authors
- Guifang Zeng (ORCID: https://orcid.org/0000-0002-5927-4730)
- Yuchuan Ren (ORCID: https://orcid.org/0000-0002-6870-4149)
- Jordi Llorca (ORCID: https://orcid.org/0000-0002-7447-9582)
- Andreu Cabot (ORCID: https://orcid.org/0000-0002-7533-3251)
- Jordi Jacas Biendicho (ORCID: https://orcid.org/0000-0001-5981-6168)
- Sharona Horta (ORCID: https://orcid.org/0000-0002-3259-1218)
- María Ibañez
- Lijie Ci
- Jordi Arbiol
- Shengnan Zhang
- Qing Sun
- Jing Yu
- Xuan Lu
Institutions
- Institució Catalana de Recerca i Estudis Avançats (ES)
- Qilu University of Technology (CN)
- Institute of Science and Technology Austria (AT)
- Shenzhen Institute of Information Technology (CN)
- Harbin Institute of Technology (CN)
- Institut Català de Nanociència i Nanotecnologia (ES)
- Institut de Recerca en Energia de Catalunya (ES)
- Shandong Academy of Sciences (CN)
- Universitat Politècnica de Catalunya (ES)
Publication Details
- Journal
- Advanced Fiber Materials
- Published
- 2026-09-08
- DOI
- https://doi.org/10.1007/s42765-026-00775-2
- Primary Topic
- Advanced Battery Materials and Technologies
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Centres de Recerca de Catalunya
- Institut Català de Nanociència i Nanotecnologia
- Generalitat de Catalunya
- China Postdoctoral Science Foundation
- Shandong Academy of Sciences
- Qilu University of Technology
- Agencia Estatal de Investigación