Multifunctional and multidimensional Na-ion structural coaxial energy storage cell

• Tipo: Artigo em Revista Científica Internacional
• Data: 2026

Autores

Beatriz Arouca Maia (Autor) FEUP; Federico Danzi (Autor) Outra; Raquel Miriam Santos (Autor) Outra; Maria Helena Braga (Autor) FEUP

Revista

Título: Composites Part B: Engineering

Nº de Série 113431 Vol. 313

ISSN: 1359-8368

Editora: Elsevier

Indexação

ISI Web of Knowledge

Scopus - 0 Citações

Projetos Associados

NGS -New Generation Storage - NGS -New Generation Storage

LAETA2023 - Programático - ET - Emerging Technologies - LAETA2023 - Programático - ET - Emerging Technologies

Outras Informações

ID Authenticus: P-01A-Y6F

DOI: 10.1016/j.compositesb.2026.113431

Abstract (EN): The seamless integration of energy storage into load-bearing structures represents a major step toward lightweight, multifunctional, and sustainable systems for next-generation electrification and digitalization. Here, we report a coaxial structural energy-storage cell capable of simultaneously withstanding mechanical loads and delivering stable electrochemical performance. The architecture consists of a carbon-fiber-reinforced polymer (CFRP) outer shell, a Cu electrode, a Na+ solid-state ferroelectric electrolyte, and an Al inner electrode, enabling direct coupling between electrochemical and mechanical responses. Scanning Kelvin Probe (SKP) mapping reveals a continuous electrochemical potential across the Na+-electrolyte/Al interface, indicative of efficient charge redistribution driven by Fermi-level differences. SKP and first-principles simulations confirm the formation of electric double-layer capacitors at both the Cu/electrolyte and CFRP/electrolyte interfaces. Three-point bending tests demonstrate retention of electrochemical function under deformation, with a flexural modulus of 59.8 ± 1.2 GPa and a maximum flexural stress of 397.1 MPa, while synchrotron X-ray micro-computed tomography verifies interfacial integrity. Systematic variation of the Al-rod radius reveals a strong geometric dependence of long-term voltage stability, with the 3-mm configuration achieving optimal ionic conductivity (54.0 ¿S cm¿1) and a dielectric constant exceeding 107. Ab initio simulations reproduce the observed chemical potentials and confirm spontaneous ferroelectric polarization. These results establish a new class of ferroelectric-driven structural batteries that combine mechanical robustness, electrochemical stability, and scalable composite manufacturing. © 2026 The Authors

Idioma: Inglês

Tipo (Avaliação Docente): Científica