arXiv subjects

Muktai Aote

Publications and source records attributed to Muktai Aote.

7 recordsLinked to original sources

arXiv2026

Optimizing Ti substitution for the enhanced densification, ionic conductivity, and microstructure of garnet-type Li$_7$La$_3$Zr$_2$O$_{12}$ solid electrolytes

Garnet-type lithium lanthanum zirconium oxide Li$_7$La$_3$Zr$_2$O$_{12}$ (LLZO) is a favorable solid electrolyte for all-solid-state Li-ion batteries due to its wide electrochemical stability, compatible ionic conductivity, and good safety. However, further improvement in ionic conductivity is required for its practical applications. In this work, titanium (Ti) is doped into LLZO to enhance its Li-ion transport properties and structural stability. The series Li$_7$La$_3$Zr$_{2-x}$Ti$_x$O$_{12}$ has been successfully synthesized using conventional solid-state reaction method. The content of Ti has been varied from 0 to 0.20 atoms per formula unit (a.p.f.u). The conducting cubic phase has been confirmed by the X-ray diffraction technique (XRD). Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) have been used for structural analysis, and elemental distribution. Density measurements have been carried out for all the samples. Electrochemical impedance spectroscopy revealed that the high ionic conductivity of $8.08\times 10^{-5}$ Scm$^{-1}$ is offered by the Li$_7$La$_3$Zr$_{1.9}$Ti$_{0.1}$O$_{12}$ sample, which has the lowest activation energy of 0.37 eV. The DC polarization analysis verified that the main contribution to conductivity in the 0.10 Ti sample comes from ions. A one order of magnitude increase in room temperature ionic conductivity is observed for the 0.10 Ti sample, making it a strong candidate for solid electrolyte applications.

cond-mat.mtrl-sci↗

arXiv2025

Impact of Ce Substitution on Structural and Electrochemical Properties of Ga Doped Garnet Li7La3Zr2O12 Solid Electrolyte

In order to replace conventional liquid electrolytes, solid electrolyte should possess high ionic conductivity. In this study, the effects of Ga-Ce co-doping on the garnet Li7La3Zr2O12 solid electrolyte have been investigated. The series Li6.4Ga0.2La3Zr2-xCexO12 has been prepared with varying content of Ce from 0 to 0.30 atoms per formula unit (a.p.f.u.) by sintering at 1050^0C. Various structural characterizations namely X-diffraction, Scanning Electron Microscopy (SEM), density measurements were carried out. The electrochemical analysis suggested that, the sample with 0.10 a.p.f.u. of Ce offered the highest room temperature ionic conductivity of 4 x 10-4 S/cm with the minimum activation energy of 0.29 eV. Moreover, DC conductivity measurement proved the predominant ionic conduction in the prepared samples making it suitable for the application in all solid state Li-ion batteries (ASSLIBs).

cond-mat.mtrl-sci↗

arXiv2025

Investigation of the doping effects of Sr-Ta on the Ionic Conductivity of Garnet Li7La3Zr2O12 Solid Electrolyte

A solid electrolyte having the ionic conductivity comparable to that of conventional liquid electrolyte can be used in All Solid State Batteries (ASSB's). The series Li6.75+xLa3-xSrxZr1.75Ta0.25O12 (x = 0 to 0.20) was synthesized to improve the ionic conductivity of garnet Li7La3Zr2O12 (LLZO). The structural, physical and morphological investigations have been carried out for all the synthesized samples using X ray diffraction, density measurement and scanning electron microscopy respectively. The results of electrochemical analysis showed that the maximum room temperature ionic conductivity of 3.5 x 10-4 S/cm and minimum activation energy of 0.29 eV is achieved by the 0.05 Sr ceramic sample sintered at 1050^oC. The DC conductivity measurement confirmed the dominance of ionic conduction in the prepared ceramic samples. The highest ionic conductivity with the minimum activation energy makes the 0.05 Sr ceramic sample a suitable choice as solid electrolyte for All Solid State Lithium Ion Batteries (ASSLIB's).

cond-mat.mtrl-sci↗

arXiv2024

Influence of Ga-Ge Doping on the Structural and Electrical Properties of Li7La3Zr2O12 Solid Electrolytes For Li ion Battery

In order to replace the conventional liquid electrolytes by solid electrolytes, high room temperature ionic conductivity is required. To achieve such high ionic conductivity, the series Li7-3xGaxLa3Zr1.9Ge0.1O12 was prepared by solid-state reaction method. The content of Ge was kept constant at 0.10 a.p.f.u, and the Ga has been varied from 0 to 0.40 a.p.f.u. The conducting cubic phase was identified using X-ray diffraction study, whereas the physical and structural studies were perfomed using density measurements and scanning electron microscopy (SEM) analysis, respectively. Electrical conductivity results reveal that the 0.20 Ga ceramic sample possessed the highest room temperature Li ion conductivity of 5.09 x 10-4 S/cm and minimum activation energy of 0.25 eV. Predominant ionic conduction in 0.20 Ga ceramic sample was confirmed by the DC polarization method. The high room temperature ionic conductivity makes the 0.20 Ga ceramic sample a suitable candidate as a solid electrolyte for all-solid-state lithium-ion batteries (ASSLIBs).

cond-mat.mtrl-sci↗

arXiv2024

Effect of Ca doping on Li ion conductivity of Ge and Ta doped garnet LLZO

The series Li6.55+xGe0.05La3-xCaxZr1.75Ta0.25O12 ( x= 0, 0.05, 0.10, 0.15, 0.20 ) was prepared by conventional solid state reaction method with the sintering temperature of 10500C for 7.30 hr by substituting Ca at the La site to increase the Li ion conductivity. The synergistic effects of Ca incorporation on Li6.55Ge0.05La3Zr1.75Ta0.25O12 were studied using various structural and electrochemical analyses. X-ray diffraction, scanning electron microscopy, and Impedance analysis were used to determine the crystal structure, morphology, and AC conductivity of the prepared ceramic samples, respectively. The highest conductivity of 9.95 x 10-4 S/cm was obtained for a 0.05 Ca ceramic sample with minimum activation energy of 0.23 eV. The DC polarization measurements confirmed the dominance of ionic conduction in 0.05 Ca ceramic. The results obtained make the 0.05 Ca ceramic sample a promising candidate as solid electrolytes for all solid state Li-ion batteries (ASSLIBs).

cond-mat.mtrl-sci↗

arXiv2023

Enhancement in Li-ion Conductivity through Co-doping of Ge and Ta in Garnet Li$_7$La$_3$Zr$_2$O$_{12}$ Solid Electrolyte

For being used as an electrolyte in All Solid State Batteries (ASSB), a solid electrolyte must possess ionic conductivity comparable to that of conventional liquid electrolytes. To achieve this conductivity range, the series Li$_{6.8-y}$Ge$_{0.05}$La$_3$Zr$_{2-y}$Ta$_y$O$_{12}$ ($y = 0, 0.15, 0.25, 0.35, 0.45$) has been synthesized using solid-state reaction method and studied using various characterization techniques. The highly conducting cubic phase is confirmed from XRD analysis. Structural information was collected using SEM and density measurements. The prepared ceramic sample containing 0.25 Ta, sintered at 1050$^\circ$C for 7.30 hrs shows the maximum ionic conductivity of 6.61 x 10$^{-4}$ S/cm at 25$^\circ$C. The air stability of the same ceramic has also been evaluated after exposure for 5 months. The minimum activation energy associated with the maximum conductivity of 0.25 Ta is 0.25 eV. The DC conductivity measurements were done to confirm the ionic nature of conductivity for all ceramic samples. The stable result of ionic conductivity makes the 0.25 Ta containing ceramic sample a promising candidate for solid electrolytes for ASSB applications.

cond-mat.mtrl-sci↗

arXiv2023

Study of Ge Doped Garnet Type Li$_7$La$_3$Zr$_2$O$_{12}$ as Solid Electrolyte for Li-ion Battery Application

Li$_{7-4x}$Ge$_x$La$_3$Zr$_2$O$_{12}$ has been synthesized using the conventional solid-state reaction method by substituting Germanium (Ge) at the Li site, which increases the Li-ion vacancies and leads to an increase in conductivity with $x$ varying from 0.05-0.20. The formation of cubic phase is confirmed by using XRD analysis. The surface morphology and elemental distribution have been studied using SEM characterization which gives the average particle size of the sample. The densities of the samples were calculated. For the confirmation of functional groups present within the sample, IR spectroscopy has been studied. The modulus and ac conductivity studies have also been studied. A complex impedance study has been done in the frequency range 20Hz-20MHz. Increase in ionic conductivity by one order has been observed in the sample with $x=0.10$. The minimum value of 0.56 eV activation energy is associated with the highest conductivity value of 7.23 x 10$^{-6}$ S/cm at room temperature. Thus increment in ionic conductivity at room temperature makes this material a promising solid electrolyte for future sustainable energy storage devices.

cond-mat.mtrl-sci↗