Effect of Nanoparticle Shape on the Electrical and Thermal Properties of Solid Polymer Electrolytes

Vasudevan, Sandhya; Fullerton‐Shirey, Susan K.

doi:10.1021/acs.jpcc.8b08029

Cited by 39 publications

(27 citation statements)

References 31 publications

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“…Therefore, on the basis of above mentioned results, it is difficult to conclude firmly that a particular type of TiO 2 and/or a fixed concentration is actually effective in tailoring the ionic conductivity of the NSPE materials. More recently, the effect of the shape of TiO 2 nanofiller on the ionic conductivity of PEO-LiClO 4 electrolytes has been explored [79]. This study concluded that the improvement of conductivity with 2 wt% TiO 2 nanorods is one order of magnitude higher than that with 5 wt% elliptical TiO 2 and it further explained the shape-property relationship in such NSPE materials.…”

Section: Effect Of Tio 2 On the Ionic Conductivity Of Various Nspe Fimentioning

confidence: 79%

Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Dhatarwal

Sengwa

2020

SN Appl. Sci.

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The effect of TiO 2 nanofiller concentration on the dielectric polarization and relaxation processes of (75PEO/25PVDF)/25 wt% LiClO 4-x wt% TiO 2 (x = 0, 2, 5, 10, 15, and 20) compositions based nanocomposite solid polymer electrolyte (NSPE) films has been investigated by employing the dielectric relaxation spectroscopy. The SEM micrographs demonstrate that the dispersion of TiO 2 nanoparticles enormously alters the spherulitic morphology with the development of some cracks, pores, and wrinkles of these solution-cast prepared NSPE films. The X-ray diffraction study confirms that the heterostructures of these NSPE materials are semicrystalline and their degree of crystallinity increases irregularly with the increase of TiO 2 concentration, however the crystallinity of host polymer blend matrix of these electrolytes decreases. The complex dielectric permittivity spectra of these NSPE materials in the frequency range from 20 Hz to 1 MHz at 27 °C reveal that there is a dominant contribution of electrode polarization and interfacial polarization at lower frequencies, whereas the high frequency permittivity values attribute to dipolar and ionic polarizations. Four types of relaxation processes have been probed by the 'master curve representation' of the dielectric and electrical spectra of these solid ion-dipole complexes. It is observed that the addition of TiO 2 nanoparticles up to 10 wt% in these electrolytes influences the dielectric properties anomalously, but a huge decrease in the dielectric polarization and increase in the relaxation times are noted resulting in a significant decrease in the ionic conductivity of the film at 20 wt% TiO 2 concentration. The dependence of dc ionic conductivity of these lithium-ion conducting NSPE materials on the chain segmental relaxation time and also the degree of crystallinity has been explored. The results of these NSPE materials have also been compared with the TiO 2 nanoparticles loaded different polymer matrices and salts based electrolytes and discussed appropriately. These lithium-ion based electrolyte films are accredited for the solid-state ion-conducting energy storing devices from their electrochemical parameters characterized by LSV, CV, and CA techniques.

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Section: Effect Of Tio 2 On the Ionic Conductivity Of Various Nspe Fimentioning

confidence: 79%

Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Dhatarwal

Sengwa

2020

SN Appl. Sci.

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“…However, NIs can have multiple shapes [ 19 ]. The shape influences the properties, for instance, NIs with a high surface to volume ratio increase the electrical conductivity in polymers [ 20 ]. This ratio similarly increases the heat transport in nanofluids [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Ballistic Heat Transport in Nanocomposite: The Role of the Shape and Interconnection of Nanoinclusions

et al. 2021

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In this article, the effect on the vibrational and thermal properties of gradually interconnected nanoinclusions embedded in an amorphous silicon matrix is studied using molecular dynamics simulations. The nanoinclusion arrangement ranges from an aligned sphere array to an interconnected mesh of nanowires. Wave-packet simulations scanning different polarizations and frequencies reveal that the interconnection of the nanoinclusions at constant volume fraction induces a strong increase of the mean free path of high frequency phonons, but does not affect the energy diffusivity. The mean free path and energy diffusivity are then used to estimate the thermal conductivity, showing an enhancement of the effective thermal conductivity due to the existence of crystalline structural interconnections. This enhancement is dominated by the ballistic transport of phonons. Equilibrium molecular dynamics simulations confirm the tendency, although less markedly. This leads to the observation that coherent energy propagation with a moderate increase of the thermal conductivity is possible. These findings could be useful for energy harvesting applications, thermal management or for mechanical information processing.

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“…Furthermore, typical Arrhenius-liked temperature-dependent conductivities of ionic conductor were observed in Figure 3c, in that the conductivities increased linearly with increasing temperature. [28], Li 3 SbS 4 (glass) [29], and 70Li 2 S-30P 2 S 5 [30]; oxide electrolyte Li 7 P 3 O 11 [31]; complex hydrides electrolyte Li 2 (BH 4 )(NH 2 ) [32]; ceramic electrolytes Li 6 BaLa 2 Nb 2 O 12 [33]; and Li 6.25 Ba 1.25 La 1.75 Ta 2 O 12 [34]; polymeric electrolytes PEO-LiTFSI [35], LiClO 4 -PEO [36], and PEO@IL@SiO 2 [35], and MOF based electrolyte: MIT-2-Li [20].…”

Section: Resultsmentioning

confidence: 99%

“…Lithium ion conductivity of HKUST-1@IL-Li ionic conductors: Nyquist plots of at different temperatures of (a) 25-100 • C and (b) −20-20 • C. (c) Arrhenius plots and corresponding Ea values of electrolyte under different temperature ranges. (d) Ionic conductivities and activation energies of HKUST-1@IL-Li electrolyte at room and high temperature in comparison with representative electrolytes: sulfides electrolytes Li 3 PS 4[28], Li 3 SbS 4 (glass)[29], and 70Li 2 S-30P 2 S 5[30]; oxide electrolyte Li 7 P 3 O 11[31]; complex hydrides electrolyte Li 2 (BH 4 )(NH 2 )[32]; ceramic electrolytes Li 6 BaLa 2 Nb 2 O 12[33]; and Li 6.25 Ba 1.25 La 1.75 Ta 2 O 12[34]; polymeric electrolytes PEO-LiTFSI[35], LiClO 4 -PEO[36], and PEO@IL@SiO 2[35], and MOF based electrolyte: MIT-2-Li[20].…”

mentioning

confidence: 99%

HKUST-1@IL-Li Solid-state Electrolyte with 3D Ionic Channels and Enhanced Fast Li+ Transport for Lithium Metal Batteries at High Temperature

Chen

Song

et al. 2021

Nanomaterials

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The challenge of safety problems in lithium batteries caused by conventional electrolytes at high temperatures is addressed in this study. A novel solid electrolyte (HKUST-1@IL-Li) was fabricated by immobilizing ionic liquid ([EMIM][TFSI]) in the nanopores of a HKUST-1 metal–organic framework. 3D angstrom-level ionic channels of the metal–organic framework (MOF) host were used to restrict electrolyte anions and acted as “highways” for fast Li+ transport. In addition, lower interfacial resistance between HKUST-1@IL-Li and electrodes was achieved by a wetted contact through open tunnels at the atomic scale. Excellent high thermal stability up to 300 °C and electrochemical properties are observed, including ionic conductivities and Li+ transference numbers of 0.68 × 10-4 S·cm-1 and 0.46, respectively, at 25 °C, and 6.85 × 10-4 S·cm-1 and 0.68, respectively, at 100 °C. A stable Li metal plating/stripping process was observed at 100 °C, suggesting an effectively suppressed growth of Li dendrites. The as-fabricated LiFePO4/HKUST-1@IL-Li/Li solid-state battery exhibits remarkable performance at high temperature with an initial discharge capacity of 144 mAh g-1 at 0.5 C and a high capacity retention of 92% after 100 cycles. Thus, the solid electrolyte in this study demonstrates promising applicability in lithium metal batteries with high performance under extreme thermal environmental conditions.

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Effect of Nanoparticle Shape on the Electrical and Thermal Properties of Solid Polymer Electrolytes

Cited by 39 publications

References 31 publications

Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Ballistic Heat Transport in Nanocomposite: The Role of the Shape and Interconnection of Nanoinclusions

HKUST-1@IL-Li Solid-state Electrolyte with 3D Ionic Channels and Enhanced Fast Li+ Transport for Lithium Metal Batteries at High Temperature

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