Multifunctional Structural Battery Composites
Summary
Multifunctional structural battery composites are an emergent class of materials that integrate energy storage capability with load-bearing function. By replacing inert structural components with active battery elements, these composites promise significant mass and volume savings in electric vehicles, aerospace platforms and portable electronics. Key constituents include carbon-based fibres that act simultaneously as mechanical reinforcement and battery electrode, a solid or gel electrolyte that transfers ions under load, and a compatible separator or laminate architecture that maintains electrochemical integrity during deformation. Recent advances have focused on raising energy density towards values competitive with conventional lithium-ion cells, while preserving high stiffness and strength, and ensuring cyclic stability under repeated mechanical and electrochemical cycling. This dual functionality opens routes to lightweight structural solutions that not only carry loads but also power the systems they support.
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Multifunctional Structural Battery Composites publication trend
The graph below shows the total number of articles in multifunctional structural battery composites across all publications each year (not limited to Nature Index journals).
Technical terms
Structural battery composite: A multifunctional material that bears mechanical loads while storing electrical energy.
Carbon fibre electrode: High-modulus carbon strands used to provide both reinforcement and an active battery surface for ion intercalation.
Structural electrolyte: A solid or gel polymer medium with sufficient ionic conductivity and stiffness to transfer load and ions simultaneously.
Coulombic efficiency: The ratio of charge delivered during discharge to charge input during charge, indicating electrochemical reversibility.
Energy density: The amount of electrical energy stored per unit mass (Wh kg⁻¹), a key metric for battery performance.
Elastic modulus: A measure of stiffness, defined as the ratio of stress to strain in the elastic regime (GPa).
References
- Unveiling the Multifunctional Carbon Fiber Structural Battery. Advanced Materials (2024).
- Structural lithium ion battery electrolytes via reaction induced phase-separation. Journal of Materials Chemistry A (2017).
- A multicell structural battery composite laminate. EcoMat (2022).
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