Enhanced lithium ionic conductivity and study of the relaxation and giant dielectric properties of spark plasma sintered Li5La3Nb2O12 nanomaterials

Ahmad, M. S.

doi:10.1016/j.ceramint.2015.01.077

Cited by 25 publications

(11 citation statements)

References 43 publications

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“…These features could be the reasons for the drop of the conductivity for SPS-900 ceramics. Similar dependence of the Li ionic conductivity on the SPS temperature was observed for Li 5 La 3 Nb 2 O 12 and Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 ceramics [33,34]. …”

Section: Resultssupporting

confidence: 68%

“…The enhanced mobility/conductivity in SPS-875 ceramics compared to SPS-850 could be due to the improved grain-to-grain bonding with increasing the SPS temperature [20-23]. With further increasing the SPS temperature, partial decomposition and/or loss of Li could occur, which may lead to the formation of minor impurity phases in the materials [20,32,33]. These features could be the reasons for the drop of the conductivity for SPS-900 ceramics.…”

Section: Resultsmentioning

confidence: 99%

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Lithium ionic conduction and relaxation dynamics of spark plasma sintered Li5La3Ta2O12 garnet nanoceramics

Ahmad

2015

Nanoscale Res Lett

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In the present work, nanoceramics of Li5La3Ta2O12 (LLT) lithium ion conductors with the garnet-like structure are fabricated by spark plasma sintering (SPS) technique at different temperatures of 850°C, 875°C, and 900°C (SPS-850, SPS-875, and SPS-900). The grain size of the SPS nanoceramics is in the 50 to 100 nm range, indicating minimal grain growth during the SPS experiments. The ionic conduction and relaxation properties of the current garnets are studied by impedance spectroscopy (IS) measurements. The SPS-875 garnets exhibit the highest total Li ionic conductivity of 1.25 × 10−6 S/cm at RT, which is in the same range as the LLT garnets prepared by conventional sintering technique. The high conductivity of SPS-875 sample is due to the enhanced mobility of Li ions by one order of magnitude compared to SPS-850 and SPS-900 ceramics. The concentration of mobile Li+ ions, nc, and their mobility are estimated from the analysis of the conductivity spectra at different temperatures. nc is found to be independent of temperature for the SPS nanoceramics, which implies that the conduction process is controlled by the Li+ mobility. Interestingly, we found that only a small fraction of lithium ions of 3.9% out of the total lithium content are mobile and contribute to the conduction process. Moreover, the relaxation dynamics in the investigated materials have been studied through the electric modulus formalism.

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Section: Resultssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Lithium ionic conduction and relaxation dynamics of spark plasma sintered Li5La3Ta2O12 garnet nanoceramics

Ahmad

2015

Nanoscale Res Lett

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“…These features could be the reasons for the drop of the conductivity for SPS-900 ceramics. Similar dependence of the Li ionic conductivity on the SPS temperature was observed for Li5La3Nb2O12 and Li1.3Al0.3Ti1.7(PO4)3 ceramics [33,34].…”

Section: T (K) σ Dc(s/cm)ω H(hzsupporting

confidence: 62%

“…The enhanced mobility/conductivity in SPS-875 ceramics compared to SPS-850 could be due to the improved grain-to-grain bonding with increasing the SPS temperature [20][21][22][23]. With further increasing the SPS temperature, partial decomposition and/or loss of Li could occur, which may lead to the formation of minor impurity phases in the materials [20,32,33]. These features could be the reasons for the drop of the conductivity for SPS-900 ceramics.…”

Section: T (K) σ Dc(s/cm)ω H(hzmentioning

confidence: 99%

Lithium ionic conduction and relaxation dynamics of spark plasma sintered Li5La3Ta2O12 garnet nanoceramics

Ahmad¹

2016

Nano Online

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which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.In the present work, nanoceramics of Li5La3Ta2O12 (LLT) lithium ion conductors with the garnet-like structure are fabricated by spark plasma sintering (SPS) technique at different temperatures of 850°C, 875°C, and 900°C (SPS-850, SPS-875, and SPS-900). The grain size of the SPS nanoceramics is in the 50 to 100 nm range, indicating minimal grain growth during the SPS experiments. The ionic conduction and relaxation properties of the current garnets are studied by impedance spectroscopy (IS) measurements. The SPS-875 garnets exhibit the highest total Li ionic conductivity of 1.25 × 10−6 S/cm at RT, which is in the same range as the LLT garnets prepared by conventional sintering technique. The high conductivity of SPS-875 sample is due to the enhanced mobility of Li ions by one order of magnitude compared to SPS-850 and SPS-900 ceramics. The concentration of mobile Li+ ions, n c, and their mobility are estimated from the analysis of the conductivity spectra at different temperatures. n c is found to be independent of temperature for the SPS nanoceramics, which implies that the conduction process is controlled by the Li+ mobility. Interestingly, we found that only a small fraction of lithium ions of 3.9% out of the total lithium content are mobile and contribute to the conduction process. Moreover, the relaxation dynamics in the investigated materials have been studied through the electric modulus formalism.

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“…The sintering process, doping strategy, microstructure and composite design have been widely investigated to enhance its performance. The LLZO solid electrolyte can be synthesized by solid‐state reaction, sol‐gel method, spark plasma sintering and hot‐press sintering method . Solid‐state reaction at high temperature is preferred because the cost is relatively low and the procedure is simple, which is suitable for large‐scale industrial producing.…”

Section: Introductionmentioning

confidence: 99%

Sintering behavior of garnet‐type Li_6.4La₃Zr_1.4Ta_0.6O₁₂ in Li₂CO₃ atmosphere and its electrochemical property

Huang

Liu

Chen

et al. 2017

Int J Applied Ceramic Tech

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The garnet‐type solid Li‐ion conductor, Li6.4La3Zr1.4Ta0.6O12, is viewed as a promising solid‐state electrolyte for the next‐generation high‐performance Li‐ion battery because of its high ionic conductivity and stability. The previous researches, in order to avoid Li volatilization loss during solid‐state reaction of sintering, mother powder with the same composition as green bodies was usually used to cover the samples, it would waste the expensive raw materials and increase the fabrication cost. In this study, a new method was proposed to prepare the Li6.4La3Zr1.4Ta0.6O12 ceramic solid‐state electrolyte where the Li loss is compensated by the outside Li2CO3. Samples prepared by this method have pure garnet phase and compact micromorphology with few pores. These samples have a high Li‐ion conductivity of 2.9×10−4 S/cm and a low activation energy of 0.37 eV at room temperature. The electronic conductivity is 1.08×10−8 S/cm, which can be neglected for solid‐state electrolyte.

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Enhanced lithium ionic conductivity and study of the relaxation and giant dielectric properties of spark plasma sintered Li5La3Nb2O12 nanomaterials

Cited by 25 publications

References 43 publications

Lithium ionic conduction and relaxation dynamics of spark plasma sintered Li5La3Ta2O12 garnet nanoceramics

Lithium ionic conduction and relaxation dynamics of spark plasma sintered Li5La3Ta2O12 garnet nanoceramics

Lithium ionic conduction and relaxation dynamics of spark plasma sintered Li5La3Ta2O12 garnet nanoceramics

Sintering behavior of garnet‐type Li_6.4La₃Zr_1.4Ta_0.6O₁₂ in Li₂CO₃ atmosphere and its electrochemical property

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Enhanced lithium ionic conductivity and study of the relaxation and giant dielectric properties of spark plasma sintered Li5La3Nb2O12 nanomaterials

Cited by 25 publications

References 43 publications

Lithium ionic conduction and relaxation dynamics of spark plasma sintered Li5La3Ta2O12 garnet nanoceramics

Lithium ionic conduction and relaxation dynamics of spark plasma sintered Li5La3Ta2O12 garnet nanoceramics

Lithium ionic conduction and relaxation dynamics of spark plasma sintered Li5La3Ta2O12 garnet nanoceramics

Sintering behavior of garnet‐type Li6.4La3Zr1.4Ta0.6O12 in Li2CO3 atmosphere and its electrochemical property

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Sintering behavior of garnet‐type Li_6.4La₃Zr_1.4Ta_0.6O₁₂ in Li₂CO₃ atmosphere and its electrochemical property