Structural composites for multifunctional applications: Current challenges and future trends

González, C.; Vilatela, Juan J.; Molina-Aldareguía, J.M.; Lopes, C.S.; LLorca, J.

doi:10.1016/j.pmatsci.2017.04.005

Cited by 235 publications

(138 citation statements)

References 270 publications

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“…are of particular interest. They can be directly used as conductive porous scaffolds, while also enabling their use in energy powering devices with augmented mechanical functions such as flexibility, stretch ability or even structural properties [12]. For instance, Zhang properties of these electrodes in a real device these CNTf-MnO2 electrodes were integrated with PYR14TFSI-based polymer electrolyte as solid self-standing and flexible supercapacitor, working at 3.0 V with high volumetric energy density and power density.…”

Section: Introductionmentioning

confidence: 99%

Manganese dioxide decoration of macroscopic carbon nanotube fibers: From high-performance liquid-based to all-solid-state supercapacitors

Pendashteh

Senokos

Palma

et al. 2017

Journal of Power Sources

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Supercapacitors capable of providing high voltage, energy and power density but yet light, low volume occupying, flexible and mechanically robust are highly interesting and demanded for portable applications. Herein, freestanding flexible hybrid electrodes based on MnO2 nanoparticles grown on macroscopic carbon nanotube fibers (CNTf-MnO2) were fabricated, without the need of any metallic current collector. The CNTf, a support with excellent electrical conductivity, mechanical stability, and appropriate pore structure, was homogeneously decorated with porous akhtenskite ɛ-MnO2 nanoparticles produced via electrodeposition in an optimized organic-aqueous mixture. Electrochemical properties of these decorated fibers were evaluated in different electrolytes including a neutral aqueous solution and a pure 1-butyl-3-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ionic liquid (PYR14TFSI). This comparison helps discriminate the various contributions to the total capacitance: (surface) Faradaic and non-Faradaic processes, improved wetting by aqueous electrolytes. Accordingly, symmetric supercapacitors with PYR14TFSI led to a high specific energy of 36 Wh·kg MnO 2 −1 (16 Wh·kg -1 including the weight of CNTf) and real specific power of 17 kW·kg MnO 2 −1 (7.5 kW·kg -1 ) at 3.0 V with excellent cycling stability. Moreover, flexible all solid-state supercapacitors were fabricated using PYR14TFSIbased polymer electrolyte, exhibiting maximum energy density of 21 Wh·kg -1 and maximum power density of 8 kW·kg -1 normalized by total active material.

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Section: Introductionmentioning

confidence: 99%

Manganese dioxide decoration of macroscopic carbon nanotube fibers: From high-performance liquid-based to all-solid-state supercapacitors

Pendashteh

Senokos

Palma

et al. 2017

Journal of Power Sources

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“…For future application of fiber‐shaped batteries, one promising direction is carrying a stack of rechargeable (micro) batteries, such as structural composite battery systems, to power smart textiles due to their small size, portability and adaptability. Another direction is wearable energy textiles.…”

Section: Technical Issues For Future Wearable Applicationsmentioning

confidence: 99%

“…Due to these limitations, most reported works normally adopt simple bending, twisting, and stretching tests by hand to determine the mechanical flexibility and durability, without obtaining quantitative data pertinent to the modulus, tensile strength, etc., which seems somewhat arbitrary . In the area of structural power composites, arranging fiber‐shaped batteries within a matrix is an important alternative method to realize the targeted assembly, which is designed considering the structural functions and electrochemical performance . The research on the structural integrality and mechanical properties of structural power composites is far ahead that of energy textiles.…”

Section: Technical Issues For Future Wearable Applicationsmentioning

confidence: 99%

An Overview of Fiber‐Shaped Batteries with a Focus on Multifunctionality, Scalability, and Technical Difficulties

et al. 2019

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active materials, [13,14] have been made. However, 1D fiber-shaped batteries offer many intriguing features and promising advantages over the conventional bulky or planar structure batteries: 1) fiber-shaped batteries exhibit high compatibility with the current textile industry. Yarn is an essential element of current fabrics, and fiber-shaped batteries can be considered as functional yarn and woven/knitted into an energy textile. 2) The fabric woven/ knitted from fiber-shaped batteries can be air permeable, which solves the problem that most planar structure batteries possess a leather-like feature impermeable to air. 3) Fiber-shaped batteries can be used to fabricate various flexible power sources with unbeatable flexibility, compatibility, and miniaturization potential, providing diverse possibilities.However, the fiber shape adversely results in a few persistent disadvantages: 1) high internal resistance. The long and thin structure of fiber-shaped batteries results in a very high internal resistance, especially considering that a piece of energy storage fabric may be woven from hundreds of meters of fiber-shaped batteries. 2) Difficult fabrication. Short circuiting must be very carefully avoided during fabrication with the long and thin electrode adopted. 3) Difficult set up of the separator. Most of the current reports used a gel electrolyte as the separator. However, considering practical applications, a specific separator cannot be avoided. Setting up a separator film between two long and thin electrodes is much more difficult than setting up a separator film between two planar structured electrodes. 4) Difficult encapsulation. While most of the current reports did not encapsulate the fiber-shaped battery, encapsulating a long and thin device is clearly difficult. 5) Difficult minimization of the thickness. A battery is an electrochemical device with an electrolyte, a separator and two electrodes. With this complicated structure, the current fiber-shaped batteries are usually much thicker than normal yarns. 6) Unsatisfactory mechanical performance of fiber-shaped batteries for weaving with a machine. The tensile strength and surface friction of fiber-shaped batteries are very different from those of traditional yarns. 7) Difficult achievement of yarn texture. With or without encapsulation, fibershaped batteries possess the texture of plastic wire instead of soft and multistrand yarn. These major problems, together with other minor issues, will be further discussed in detail in Section 7.Flexible and wearable energy storage devices are receiving increasing attention with the ever-growing market of wearable electronics. Fiber-shaped batteries display a unique 1D architecture with the merits of superior flexibility, miniaturization potential, adaptability to deformation, and compatibility with the traditional textile industry, which are especially advantageous for wearable applications. In the recent research frontier in the field of fiber-shaped batteries, in addition to higher performance, advances in mult...

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“…This progress in industrial applications has been supported by the availability of different open-source software packages that can be used to represent the microstructure of polycrystals (Dream.3D, 2018;Neper, 2018) and to simulate the mechanical behavior using mean-field (Lebensohn and Tomé, 1993;Lebensohn et al, 2007) and/or full-field methods based on the FEM or the FFT (Damask, 2018;CAPSUL, 2018). The application of "virtual testing" and " virtual design" methodologies based on CHP is expected to have a significant industrial impact, as it has already happened in the field of composite materials for aerospace (LLorca et al, 2011;González et al, 2017). In particular, it will greatly reduce the number of experimental tests necessary to characterize the mechanical behavior of new materials and will provide guidelines to modify the microstructure of the latter in order to improve their mechanical performance under different loading conditions.…”

Section: Concluding Remarks and Future Developmentsmentioning

confidence: 99%

Computational Homogenization of Polycrystals

Segurado

Lebensohn

LLorca

2018

Advances in Applied Mechanics

100

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This paper reviews the current state-of-the-art in the simulation of the mechanical behavior of polycrystalline materials by means of computational homogenization. The key ingredients of this modelling strategy are presented in detail starting with the parameters needed to describe polycrystalline microstructures and the digital representation of such microstructures in a suitable format to perform computational homogenization. The different crystal plasticity frameworks that can describe the physical mechanisms of deformation in single crystals (dislocation slip and twinning) at the microscopic level are presented next. This is followed by the description of computational homogenization methods based on mean-field approximations by means of the viscoplastic self-consistent approach, or on the full-field simulation of the mechanical response of a representative polycrystalline volume element by means of the finite element method or the fast Fourier transform-based method. Multiscale frameworks based on the combination of mean-field homogenization and the finite element method are presented next to model the plastic deformation of polycrystalline specimens of arbitrary geometry under complex mechanical loading. Examples of application to predict the strength, fatigue life, damage, and texture evolution under different conditions are presented to illustrate the capabilities of the different models. Finally, current challenges and future research directions in this field are summarized.

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Structural composites for multifunctional applications: Current challenges and future trends

Cited by 235 publications

References 270 publications

Manganese dioxide decoration of macroscopic carbon nanotube fibers: From high-performance liquid-based to all-solid-state supercapacitors

Manganese dioxide decoration of macroscopic carbon nanotube fibers: From high-performance liquid-based to all-solid-state supercapacitors

An Overview of Fiber‐Shaped Batteries with a Focus on Multifunctionality, Scalability, and Technical Difficulties

Computational Homogenization of Polycrystals

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