A facile preparation method and proof of cycle-stability of carbon-coated metal oxide and disulfide battery materials

Guo, Peng; Singer, L.; Zhao, Zhiyong; Kukułka, Wojciech; Sebastian, Finn; Mijowska, Ewa; Zharnikov, Michael; Comba, Peter; Klingeler, R.

doi:10.1016/j.electacta.2023.142540

Cited by 2 publications

(1 citation statement)

References 49 publications

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“…As ion and electron polarization usually occur in the higher frequency region they are excluded from microwave absorption . The presence of multiple twisted Cole–Cole semicircles on the Debye relaxation curves can be seen in Figure a–d, indicating the presence of other polarization mechanisms such as conductivity loss, interfacial polarization, oxygen defects, etc. , Where the two Cole–Cole semicircles of Figure a correspond to the two relaxation peaks at 2.44 and 14.68 GHz for the ε″ of the S 0 sample. The FeSiAl surface is coated with massive PANI, resulting in abundant nonhomogeneous interfaces, and under the action of alternating electromagnetic field, the charge aggregates on the nonhomogeneous interfaces to produce interfacial polarization. − Besides the interfacial polarization, the FeSiAl@PANI composites introduced a large number of defects during the preparation process, and these defects and the functional groups of PANI can act as a dipole, whose directional rotation induces a dipole polarization. , Thus, the relative concentration of the two semicircles indicates the dipole polarization and interfacial polarization produced by the PANI cladding (Figure b).…”

Section: Resultsmentioning

confidence: 94%

Fabrication and Microwave Absorption Properties of FeSiAl@PANI Composites

Liu,

Sun,

Yan

et al. 2023

ACS Appl. Electron. Mater.

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Composites of ferromagnetic particles and conductive polymers have potential applications in the wave-absorbing stealth technology. In this paper, FeSiAl@polyaniline (FeSiAl@ PANI) composites were prepared through in situ oxidative polymerization. Electromagnetic parameters of the FeSiAl composites were modulated by varying the aniline content. The inhomogeneous interface between amorphous PANI and FeSiAl provides interfacial polarization, charge accumulation, and defects in the PANI layer, which causes dipole polarization and conductive loss, so that multiple loss mechanisms result in the FeSiAl@PANI composites with superior absorbing properties. When 1 g of aniline monomer is added, the lowest reflection loss (RL) can be obtained for the S 1 sample at a thickness of only 1 mm with an RL min value of −37.87 dB. Radar cross-sectional (RCS) simulations using computer simulation technology (CST) for the S 1 sample showed an RCS reduction value of 31.64 dBm 2 . Therefore, the FeSiAl@PANI composite is anticipated to be a candidate material for radar stealth technology and electromagnetic absorption.

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Section: Resultsmentioning

confidence: 94%

Fabrication and Microwave Absorption Properties of FeSiAl@PANI Composites

Liu,

Sun,

Yan

et al. 2023

ACS Appl. Electron. Mater.

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Synthetically encapsulated & self-organized transition metal oxide nano-structures inside carbon nanotubes as robust: Li-ion battery anode materials

Kapoor

Patrike

Singh

et al. 2023

J. Phys. D: Appl. Phys.

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We report a comparative study on the electrochemical performance of four different Transition Metal Oxides encapsulated inside carbon nanotubes (Oxide@CNT), along with a reference data obtained on a bare-oxide. A key result here is that the encapsulation leads to superior cyclic stability, irrespective of the type of the oxide-encapsulate. This comparison also enables us to isolate the advantages associated with the encapsulation of oxide within the core cavity of CNT, as opposed to the case of oxide/CNT composites, in which oxide resides outside the CNT. Innovative use of camphor during sample synthesis enables precise control over the morphology of the filled CNT, which can be either in aligned-forest or in entangled geometry. Morphology appears to play a crucial role in tuning the magnitude of the specific capacity, whereas the encapsulation relates to the cyclic stability. Overall, the electrochemical data on various Oxides@CNT bring forward interesting inferences pertaining to the morphology, filling fraction of the oxide-encapsulate, and the presence of oxide nano-particles adhering outside the CNT. Our results provides useful pointers for optimization of these critical parameters, thus paving the way for Oxide@CNT for practical electrochemical applications.

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A facile preparation method and proof of cycle-stability of carbon-coated metal oxide and disulfide battery materials

Cited by 2 publications

References 49 publications

Fabrication and Microwave Absorption Properties of FeSiAl@PANI Composites

Fabrication and Microwave Absorption Properties of FeSiAl@PANI Composites

Synthetically encapsulated & self-organized transition metal oxide nano-structures inside carbon nanotubes as robust: Li-ion battery anode materials

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