@article{22966,
  abstract     = {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)–Li6.4La3Zr1.4Ta0.6O12 (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|LiFePO4 (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.},
  author       = {Zhang, Shengnan and Zeng, Guifang and Yu, Jing and Horta, Sharona and Lu, Xuan and Sun, Qing and Ren, Yuchuan and Ibáñez, Maria and Llorca, Jordi and Biendicho, Jordi Jacas and Arbiol, Jordi and Ci, Lijie and Cabot, Andreu},
  issn         = {2524-793X},
  journal      = {Advanced Fiber Materials},
  publisher    = {Springer},
  title        = {{Reinforced poly(ionic liquid)-in-salt electrolytes for highly stable solid-state Lithium metal batteries}},
  doi          = {10.1007/s42765-026-00775-2},
  year         = {2026},
}