Lithiation and delithiation induced magnetic switching and electrochemical studies in α-LiFeO2 based Li ion battery

Su, Kai-Han; Chi, Po‐Wei; Paul, Thierry; Chung, Chan‐Hwa; Chen, W.M.; Su, Yi; Wu, Phillip M.; Su, Chung-Yen; Wu, Maw–Kuen

doi:10.1016/j.mtphys.2021.100373

Cited by 8 publications

(8 citation statements)

References 48 publications

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“…Secondly, during charging, a broad peak around 1.69 V corresponds to oxidation of Fe 0 to Fe 3+ Ref. 45 . To understand the effect of the lithiation and delithiation peaks on the ion transport additional EIS measurements were performed at 0.1 °C rate at different potentials and the results are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Computation of distribution of relaxation times by Tikhonov regularization for Li ion batteries: usage of L-curve method

Paul

et al. 2021

Sci Rep

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In this paper, the distribution of relaxation times (DRTs) functions are calculated numerically in Matlab for synthetic impedance data from single parallel $$RC$$ RC circuit and two parallel $$RC$$ RC circuits connected in series, experimental impedance data from supercapacitors and α-LiFeO2 anode based Li ion batteries. The quality of the impedance data is checked with the Kramers–Krönig (KK) relations. The DRTs are calculated within the KK compatible regime for all the systems using Tikhonov regularization (TR) method. Here we use a fast and simple L-curve method to estimate the TR parameter (λ) for regularization of the Fredholm integral equations of first kind in impedance. Estimation of the regularization parameters are performed effectively from the offset of the global corner of the L-curve rather than simply using the global corner. The physical significances of DRT peaks are also discussed by calculating the effective resistances and capacitances coupled with peak fitting program. For instance, two peaks in the DRTs justify the electrical double layer capacitance and ion diffusion phenomena for supercapacitors in low to intermediate frequencies respectively. Moreover, the surface film effect, Li/electrolyte and electrode/electrolyte charge transfer related processes are identified for α-LiFeO2 anode based Li-ion batteries. This estimation of the offset of the global corner extends the L-curve approach coupled with the Tikhonov regularization in the field of electrochemistry and can also be applied in similar process detection methods.

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Section: Resultsmentioning

confidence: 99%

Computation of distribution of relaxation times by Tikhonov regularization for Li ion batteries: usage of L-curve method

Paul

et al. 2021

Sci Rep

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“…The DFRT for all the samples at different temperatures was found by impedance spectroscopy genetic programming (ISGP) [30][31][32][33][34][35][36][37][38], a MATLAB-based open-source code. The following equation shows the correlation between the measured impedance and the DFRT:…”

Section: Methodsmentioning

confidence: 99%

Influence of Isovalent ‘W’ Substitutions on the Structure and Electrical Properties of La2Mo2O9 Electrolyte for Intermediate-Temperature Solid Oxide Fuel Cells

Paul

Tsur

2021

Ceramics

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Lanthanum molybdenum oxide (La2Mo2O9, LAMOX)-based ion conductors have been used as potential electrolytes for solid oxide fuel cells. The parent compound La2Mo2O9 undergoes a structural phase transition from monoclinic (P21) to cubic (P213) at 580 °C, with an enhancement in oxide ion conductivity. The cubic phase is of interest because it is beneficial for oxide ion conduction. In search of alternative candidates with a similar structure that might have a stable cubic phase at lower temperatures, we have studied the variations of the crystal structure and ionic conductivity for 25, 50, 62.5 and 75 mol% W substitutions at the Mo site using high-temperature X-ray diffraction, dilatometry, and impedance spectroscopy. Highly dense ceramic samples have been synthesized by solid-state reaction in a two-step sintering process. Low-angle X-ray diffraction and Rietveld refinement confirm the stabilization of the cubic phase for all compounds in the entire temperature range considered. The substitutions of W at the Mo site produce a decrement in the lattice parameter. The thermal expansion coefficients in the high-temperature range of the W-substituted ceramics, as determined by dilatometry, are much higher than that of the unmodified sample. The impedance spectra have been modeled using a modified genetic algorithm within 300–600 °C. A distribution function of the relaxation times is obtained, and the contributions of ohmic drop, grains and grain boundaries to the conductivity have been identified. Overall, our investigation provides information about cationic substitution and insights into the understanding of oxide ion conductivity in LAMOX-based compounds for developing solid oxide fuel cells.

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“…The distribution function of relaxation times (DFRTs) was calculated by the Impedance Spectroscopy Genetic Programming (ISGP) program using the impedance spectra after different cycles [ 39 , 40 , 41 , 42 , 43 , 44 ]. As the DFRT approach is applicable only in the Kramers–Krönig (KK) relations compatible regime, the supporting figure ( Supplementary Materials , Figure S19 ) suggests that we can safely identify three peaks within the KK compatible regime (around 0.1 Hz).…”

Section: Methodsmentioning

confidence: 99%

“…As the DFRT approach is applicable only in the Kramers–Krönig (KK) relations compatible regime, the supporting figure ( Supplementary Materials , Figure S19 ) suggests that we can safely identify three peaks within the KK compatible regime (around 0.1 Hz). A similar approach is also adopted elsewhere [ 39 , 40 , 41 , 45 ]. The Rietveld refinement of the XRD pattern was performed by FullProf software package, the Fourier maps were calculated using GFourier and the crystal structure was plotted using VESTA [ 46 , 47 ].…”

Section: Methodsmentioning

confidence: 99%

Electrochemical Performance of Orthorhombic CsPbI3 Perovskite in Li-Ion Batteries

et al. 2021

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A facile solution process was employed to prepare CsPbI3 as an anode material for Li-ion batteries. Rietveld refinement of the X-ray data confirms the orthorhombic phase of CsPbI3 at room temperature. As obtained from bond valence calculations, strained bonds between Pb and I are identified within PbI6 octahedral units. Morphological study shows that the as-prepared δ-CsPbI3 forms a nanorod-like structure. The XPS analysis confirm the presence of Cs (3d, 4d), Pb (4d, 4f, 5d) and I (3p,3d, 4d). The lithiation process involves both intercalation and conversion reactions, as confirmed by cyclic voltammetry (CV) and first-principles calculations. Impedance spectroscopy coupled with the distribution function of relaxation times identifies charge transfer processes due to Li metal foil and anode/electrolyte interfaces. An initial discharge capacity of 151 mAhg−1 is found to continuously increase to reach a maximum of ~275 mAhg−1 at 65 cycles, while it drops to ~240 mAhg−1 at 75 cycles and then slowly decreases to 235 mAhg−1 at 100 cycles. Considering the performance and structural integrity during electrochemical performance, δ-CsPbI3 is a promising material for future Li-ion battery (LIB) application.

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Lithiation and delithiation induced magnetic switching and electrochemical studies in α-LiFeO2 based Li ion battery

Cited by 8 publications

References 48 publications

Computation of distribution of relaxation times by Tikhonov regularization for Li ion batteries: usage of L-curve method

Computation of distribution of relaxation times by Tikhonov regularization for Li ion batteries: usage of L-curve method

Influence of Isovalent ‘W’ Substitutions on the Structure and Electrical Properties of La2Mo2O9 Electrolyte for Intermediate-Temperature Solid Oxide Fuel Cells

Electrochemical Performance of Orthorhombic CsPbI3 Perovskite in Li-Ion Batteries

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