@article{Li2026, 
author = {Jiamin Li and Shuyu Bi and Tong Duan and Yanbo Liu and Qiangchao Sun and Tao Hu and Xionggang Lu and Hongwei Cheng},
title = {Boosting Li+ transport in ultra-stable all-solid-state lithium metal batteries via bimetal oxide enhanced PrBaCoFeO5+δ perovskite nanofillers},
year = {2026},
journal = {Nano Research},
volume = {19},
number = {1},
pages = {94908178},
keywords = {composite solid electrolytes, double-perovskite filler, Lewis acid-base interaction, interfacial catalysis, all-solid-state lithium metal batteries},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94908178},
doi = {10.26599/NR.2025.94908178},
abstract = {Composite solid-state electrolytes (CSEs) have garnered significant attention for next-generation energy storage owing to their inherent safety features compared with those of their liquid counterparts. However, their practical deployment remains hindered by sluggish lithium-ion transport kinetics and interfacial instability. Herein, we introduced a bimetal oxide enhanced strategy for oxygen-vacancy-engineered double perovskite nanofillers (PrBaCoFeO5+δ (PBCF)) to address these challenges in polyethylene oxide (PEO)-based CSEs. The strong Lewis acid-base coordination between Co3+/Fe3+ sites on PBCF and ether oxygen groups in PEO effectively suppresses the polymer-chain crystallization while creating continuous Li+ conduction pathways. Importantly, the abundant oxygen vacancies serve as catalytic centers to decompose lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), thereby forming a robust organic–inorganic hybrid solid electrolyte interphase (SEI). Consequently, the prepared PEO-LiTFSI-PBCF CSE achieves an improved Li+ ionic conductivity of 2.76 × 10−4 S·cm−1 (30 °C) and an elevated Li+ transference number (0.54). The Li||Li symmetric cell exhibits impressive lithium plating/stripping ability (> 6000 h at 0.1 mA·cm−2) and practical viability in Li||LiFePO4 full cells with 90.1% capacity retention after 500 cycles at 30 °C (0.3 C). This defect engineering strategy provides new insights into the construction of fast and stable Li+ transport channels in polymer solid-state electrolytes, paving the way for high-energy-density all-solid-state lithium metal batteries.}
}