Structure and ionic conductivity of Li7La3Zr2−xGexO12 garnet-like solid electrolyte for all solid state lithium ion batteries

Hu, Shuqiao; Li, You-Fen; Yang, Renqiang; Yang, Zijian; Wang, Lege

doi:10.1016/j.ceramint.2018.01.065

Cited by 62 publications

(25 citation statements)

References 26 publications

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“…In general, AC conductivity values increase at lower frequencies as chromium concentration increases, which is related to the interaction of the doped chromium ions with HA, which affects conductivity positively. However, at higher frequencies, the electrical conductivity displays quite similar values, especially for higher chromium concentrations S3 and S4, which can be attributed to the reduction in pores and interspaces for chromium ions, which reduced the conductivity [19].…”

Section: Resultsmentioning

confidence: 97%

Influence of doping chromium ions on the electrical properties of hydroxyapatite

Ibrahim

Dawood

2020

Egyptian Journal of Basic and Applied Sciences

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Hydroxyapatite Ca 10 [PO 4 ] 6 [OH] is a biocompatible widely used in medicine and dentistry. Its applications depend greatly upon lattice substitution of Calcium sites in its structure by varies cations such as Na, Mg, Sr, Ag etc. Chromium plays an important role in reducing blood sugar level and improving insulin ability to convert glucose in cells to gain energy. In this paper we studied the effect of doping hydroxyapatite with chromium ions on its crystal dielectric properties. Pure hydroxyapatite and chromium loaded hydroxyapatite of chromium concentrations of 0.5, 1.0, 2.0, and 3.0 wt % forming samples S1, S2, S3 and S4 respectively were prepared by wet precipitation method. The dielectric parameters, permittivity ἐ, dielectric loss ἕ, conductivity σ, relaxation time t s and dielectric modulus M' and M'' were calculated at frequency of 20 Hz to 10 MHz. Results showed increase of ἐ, and ἕ, values of chromium loaded samples compared to pure hydroxyapatite. The conductivity of the doped samples was increased with chromium concentration increase. The relaxation times (t s ) chromium loaded samples showed increase of t s as chromium concentration increase. The dielectric properties showed that as chromium concentration increase, ἐ, ἕ, and σ of substance increase compared to the pure HA.

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Section: Resultsmentioning

confidence: 97%

Influence of doping chromium ions on the electrical properties of hydroxyapatite

Ibrahim

Dawood

2020

Egyptian Journal of Basic and Applied Sciences

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“…It was concluded that the existing GB is not energetically preferred for either Li accommodation or transport, giving rise to the poor GB conductivity. Papers including one by Ma et al [20] perfectly demonstrates the correlation between atomic-scale GB structure and ionic conductivity in Li superionic conductors [27,261,264].…”

Section: Electrical Propertiesmentioning

confidence: 92%

“…Doping has been effective in improving total conductivity values in some oxides [259]. In general, doping of elements such as Al 3+ /Ge 4+ at the Li sites and Ta 5+ /Nb 5+ at the Zr sites has stabilized the cubic garnet and reduced Li ion migration activation energy thereby increasing the Li ion conductivity [260,261]. The substitution of the Zr 4+ sites by Ge 4+ improved ionic conductivity to be 4.78 × 10 −4 S cm −1 at 20 • C with an activation energy of 0.29 eV which are among the best in the field [262,263].…”

Section: Electrical Propertiesmentioning

confidence: 99%

A Review of Grain Boundary and Heterointerface Characterization in Polycrystalline Oxides by (Scanning) Transmission Electron Microscopy

et al. 2021

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Interfaces such as grain boundaries (GBs) and heterointerfaces (HIs) are known to play a crucial role in structure-property relationships of polycrystalline materials. While several methods have been used to characterize such interfaces, advanced transmission electron microscopy (TEM) and scanning TEM (STEM) techniques have proven to be uniquely powerful tools, enabling quantification of atomic structure, electronic structure, chemistry, order/disorder, and point defect distributions below the atomic scale. This review focuses on recent progress in characterization of polycrystalline oxide interfaces using S/TEM techniques including imaging, analytical spectroscopies such as energy dispersive X-ray spectroscopy (EDXS) and electron energy-loss spectroscopy (EELS) and scanning diffraction methods such as precession electron nano diffraction (PEND) and 4D-STEM. First, a brief introduction to interfaces, GBs, HIs, and relevant techniques is given. Then, experimental studies which directly correlate GB/HI S/TEM characterization with measured properties of polycrystalline oxides are presented to both strengthen our understanding of these interfaces, and to demonstrate the instrumental capabilities available in the S/TEM. Finally, existing challenges and future development opportunities are discussed. In summary, this article is prepared as a guide for scientists and engineers interested in learning about, and/or using advanced S/TEM techniques to characterize interfaces in polycrystalline materials, particularly ceramic oxides.

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“…Rangasamy et al reported an experiment where they used Ce 4+ as a dopant into La sites and found a stabilized structure with the highest ionic conductivity of 1.4 × 10 −5 S/cm for 0.2 pfu of Ce; but the ionic conductivity starts to decrease when Ce content exceeded 0.2 pfu [92]. Doping of the Zr site still is a source of interest as Zr is a common element of Li garnets [16,147,148], so it is possible to explore new information using Zr substitutes; a lot of research has been carried out by doping Zr sites with different cation dopants such as Ta [43,83,[149][150][151][152][153][154][155][156], Y [108], Mo [157], Sb [86,99], Nb [158,159], W [79] and Ge [160]. Besides the single site doping, extensive research is also in progress on co-doping of LLZO, in which two or three sites are doped simultaneously to produce a stable structure, however poor ionic conductivity at room temperature is a major concern for co-doping [91,161].…”

Section: Doping and LI Ionic Conductivitymentioning

confidence: 99%

Crystal Structure and Preparation of Li7La3Zr2O12 (LLZO) Solid-State Electrolyte and Doping Impacts on the Conductivity: An Overview

et al. 2021

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As an essential part of solid-state lithium-ion batteries, solid electrolytes are receiving increasing interest. Among all solid electrolytes, garnet-type Li7La3Zr2O12 (LLZO) has proven to be one of the most promising electrolytes because of its high ionic conductivity at room temperature, low activation energy, good chemical and electrochemical stability, and wide potential window. Since the first report of LLZO, extensive research has been done in both experimental investigations and theoretical simulations aiming to improve its performance and make LLZO a feasible solid electrolyte. These include developing different methods for the synthesis of LLZO, using different crucibles and different sintering temperatures to stabilize the crystal structure, and adopting different methods of cation doping to achieve more stable LLZO with a higher ionic conductivity and lower activation energy. It also includes intensive efforts made to reveal the mechanism of Li ion movement and understand its determination of the ionic conductivity of the material through molecular dynamic simulations. Nonetheless, more insightful study is expected in order to obtain LLZO with a higher ionic conductivity at room temperature and further improve chemical and electrochemical stability, while optimal multiple doping is thought to be a feasible and promising route. This review summarizes recent progress in the investigations of crystal structure and preparation of LLZO, and the impacts of doping on the lithium ionic conductivity of LLZO.

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Structure and ionic conductivity of Li7La3Zr2−xGexO12 garnet-like solid electrolyte for all solid state lithium ion batteries

Cited by 62 publications

References 26 publications

Influence of doping chromium ions on the electrical properties of hydroxyapatite

Influence of doping chromium ions on the electrical properties of hydroxyapatite

A Review of Grain Boundary and Heterointerface Characterization in Polycrystalline Oxides by (Scanning) Transmission Electron Microscopy

Crystal Structure and Preparation of Li7La3Zr2O12 (LLZO) Solid-State Electrolyte and Doping Impacts on the Conductivity: An Overview

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