Li Ion Diffusion in Nanocrystalline and Nanoglassy LiAlSi 2 O 6 and LiBO 2 - Structure-Dynamics Relations in Two Glass Forming Compounds

Kuhn, Alexander; Tobschall, Esther; Heitjans, Paul

doi:10.1515/nano.0048.00041

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…68 For the glass, motional narrowing (MN) begins at T MN,glass = 286 K. Milling the glass for 24 h shifts the onset to T = 362 K (see Figure 4b); the same behavior has been seen for βspodumene and nanoglassy LiBO 2 . 41,42 Interestingly, the shorter milling time of 6 h does not influence T MN,glass . Obviously, the spins in the partly relaxed regions of the 6 h nanoglass are able to cause the same MN as for the quenched glassy sample with its homogeneous structure.…”

Section: Resultsmentioning

confidence: 95%

“…The signal at ∼47 ppm corresponds to the AlO 4 units in LiAlSi 4 O 10 . 42 The increase in line broadening and asymmetry reflects the increase in distributions of chemical shifts and electric field gradients sensed by the Al ions. This finding, as well as the indication of different 7 Li NMR line widths in the extreme limit of MN, supports the idea of structural relaxation (Figure 4a) induced by mechanical milling of glassy samples that were obtained by quenching procedures.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Glass in Two Forms: Heterogeneous Electrical Relaxation in Nanoglassy Petalite

et al. 2019

Self Cite

View full text Add to dashboard Cite

Glassy materials with specific functions are almost universally used in our daily life. If prepared via quenching, that is, by rapid cooling of the molten glass, a frozen liquid with a high degree of lattice disorder and stress is obtained. The release of stress through mechanical action may significantly affect the microstructure and dynamic features of the so-obtained nanoglass. Considering ion conducting glasses, it has recently been shown that mechanical treatment of glasses causes the long-range ion transport to significantly decrease. The origin of this astonishing behavior of nanoglasses is, however, far from being understood completely. Here, we show that depending on the duration of mechanical impact in a high-energy planetary ball mill, the petalite glass, LiAlSi4O10, passes through a state with two Li reservoirs distinctly differing in electrical relaxation and, thus, in ion transport. The two species, characterized by electrical relaxation rates differing by two orders of magnitude, show up clearly if we use the electric modulus representation to analyze the data. This feature is also seen in conductivity spectra revealing a two-step increase of the conductivity with frequency. Accordingly, we propose a two-phase model with nanometer-sized non-relaxed glassy particles next to or surrounded by structurally relaxed regions.

show abstract

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Glass in Two Forms: Heterogeneous Electrical Relaxation in Nanoglassy Petalite

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…86,87 Examples in this concern are mainly the model systems with single phase such as LiBO 2 , LiAlSi 2 O 6 , LiNbO 3 , or LiTaO 3 . [88][89][90] The discovery of interfacial fast lithium-ion diffusion opens up a route for improving the conductivity of oxide electrolytes. However, most of previously investigated material systems still exhibit low RT conductivities (e.g., <10 À5 S/cm) and other problems such as stability, and no promising candidates used as solid electrolytes for ASLBs have yet been found.…”

Section: Historical Perspectivementioning

confidence: 99%

Oxide Electrolytes for Lithium Batteries

et al. 2015

View full text Add to dashboard Cite

As the most promising candidate of the solid electrolyte materials for future lithium batteries, oxide electrolytes with highlithium-ion conductivity have experienced a rapid development in the past few decades. Existing oxide electrolytes are divided into two groups, i.e., crystalline group including NASICON, perovskite, garnet, and some newly developing structures, and amorphous/glass group including Li 2 O-MO x (M = Si, B, P, etc.) and LiPON-related materials. After a historical perspective on the general development of oxide electrolytes, we try to give a comprehensive review on the oxide electrolytes with high-lithium-ion conductivity, with special emphasis on the aspect of materials selection and design for applications as solid electrolytes in lithium batteries. Some successful examples and meaningful attempts on the incorporation of oxide electrolytes in lithium batteries are also presented. In the conclusion part, an outlook for the future direction of oxide electrolytes development is given.

show abstract

Li Ion Diffusion in Nanocrystalline and Nanoglassy LiAlSi 2 O 6 and LiBO 2 - Structure-Dynamics Relations in Two Glass Forming Compounds

Cited by 2 publications

References 0 publications

Glass in Two Forms: Heterogeneous Electrical Relaxation in Nanoglassy Petalite

Glass in Two Forms: Heterogeneous Electrical Relaxation in Nanoglassy Petalite

Oxide Electrolytes for Lithium Batteries

Contact Info

Product

Resources

About