The effects of crystallization parameters on the ionic conductivity of a lithium aluminum germanium phosphate glass–ceramic

Thokchom, Joykumar S.; Kumar, Binod

doi:10.1016/j.jpowsour.2009.11.037

Cited by 127 publications

(83 citation statements)

References 13 publications

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“…Estimated lithium ion conductivity of the LAGP pellets calcined at 800, 850, and 900 o C were 6.1×10 -5 , 1.4×10 -4 , and 7.0×10 -5 .S cm -1 , respectively. The LAGP pellet calcined at 850 o C possessed the highest lithium ion conductivity among the pellets, however, it was lower than reported value 5 .…”

Section: Methodscontrasting

confidence: 65%

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PREPARATION OF Li1.5Al0.5Ge1.5(PO4)3 SOLID ELECTROLYTE BY SOL-GEL METHOD

Kotobuki

Hoshina

Isshiki

et al. 2011

Phosphorus Research Bulletin

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Li 1+x Al x Ge 2-x (PO 4 ) 3 (LAGP) solid electrolyte is one of the promising solid electrolytes for lithium ion batteries. The LAGP electrolyte was prepared by a sol-gel method. A gelation powder was calcined at 500 o C to obtain precursor powder for LAGP. The obtained powder was pelletized and calcined at 800, 850, and 900 o C. The pellets possessed NASICON structure, indicating that the LAGP was successfully prepared. The pellet calcined at 850 o C showed the highest lithium ion conductivity, 1.4×10 -4 S cm -1 , which is acceptable for all-solid-state lithium battery. Although some modification is still needed to improve the lithium ion conductivity of LAGP prepared by the sol-gel method, this finding provides us a new route for LAGP preparation.

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Section: Methodscontrasting

confidence: 65%

“…The LAGP has an advantage for electrochemical window because Ge 4+ is insensitive to reduction 12 in contrast with Ti 4+ . The LAGP preparation has been performed by melt-quenching [13][14][15] or solid-solution method 16 . These methods need high temperature (> 1000 o C).…”

Section: Introductionmentioning

confidence: 99%

PREPARATION OF Li1.5Al0.5Ge1.5(PO4)3 SOLID ELECTROLYTE BY SOL-GEL METHOD

Kotobuki

Hoshina

Isshiki

et al. 2011

Phosphorus Research Bulletin

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“…The highest electrical conductivity of 4.62 × 10 −3 S cm −1 at 27°C was reported for the Li1.5Al0.5Ge1.5(PO4)3 glass-ceramic by Thokchom and Kumar (2010). However, Fu (1997) studied the Li1−xAlxGe2−x(PO4)3 glass-ceramics and found the electrical conductivity of Li1.5Al0.5Ge1.5(PO4)3 was 4.0 × 10 −4 S cm −1 at 25°C, and also Xu et al (2007) found an electrical conductivity of 7.25 × 10 −4 S cm −1 at room temperature for the Li1.5Al0.5Ge1.5(PO4)3-0.05 Li2O glass-ceramic.…”

Section: Introductionmentioning

confidence: 95%

High Lithium-Ion-Conducting NASICON-Type Li1+xAlxGeyTi2−x−y(PO4)3 Solid Electrolyte

et al. 2016

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A water-stable solid electrolyte is a key material without which aqueous lithium-air batteries could not be operated. In this study, we have examined the electrical conductivity and mechanical properties of a water-stable lithium-ion-conducting solid electrolyte, Li1+xAlxGeyTi2−x−y(PO4)3 with the NASICON-type structure, as a function of the Al and Ge content. Li1+xAlxGeyTi2−x−y(PO4)3 was synthesized by the conventional solid-state reaction method. The highest lithium-ion conductivity of 1.0 × 10 −3 S cm −1 at 25°C and the highest three-point bending strength of 90 N mm −2 at room temperature were observed for a pellet of Li1.45Al0.45Ge0.2Ti1.35(PO4)3 sintered at 900°C.

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“…Raising sintering temperatures is the simplest approach, but for LAGP above 800-825°C, phase separation occurs with formation of insulating phases (Thockchom and Kumar, 2010;Mariappan et al, 2011). The use of high heating rates, for example, by spark plasma sintering (SPS), to increase sintering rates has been well described.…”

mentioning

confidence: 99%

“…Finally, we note that a number of investigations have shown that the manner of material synthesis, and especially crystallization parameters, can substantially influence the conductivity of the final product (Thockchom and Kumar, 2010;Yang et al, 2015). Subjecting amorphous materials to alternating electrical fields, microwave irradiation in particular, has been used to promote uniform crystallization (Mahmoud, 2007).…”

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confidence: 99%

Improving NASICON Sinterability through Crystallization under High-Frequency Electrical Fields

Lisenker

Stoldt

2016

Front. Energy Res.

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The effect of high-frequency (HF) electric fields on the crystallization and sintering rates of a lithium aluminum germanium phosphate (LAGP) ion conducting ceramic was investigated. LAGP with the nominal composition Li1.5Al0.5Ge1.5(PO4)3 was crystallized and sintered, both conventionally and under effect of electrical field. Electrical field application, of 300 V/cm at 1 MHz, produced up to a 40% improvement in sintering rate of LAGP that was crystallized and sintered under the HF field. Heat sink effect of the electrodes appears to arrest thermal runaway and subsequent flash behavior. Sintered pellets were characterized using X-ray diffraction, scanning electron microscope, TEM, and electrochemical impedance spectroscopy to compare conventionally and field-sintered processes. The as-sintered structure appears largely unaffected by the field as the sintering curves tend to converge beyond initial stages of sintering. Differences in densities and microstructure after 1 h of sintering were minor with measured sintering strains of 31 vs. 26% with and without field, respectively. Ionic conductivity of the sintered pellets was evaluated, and no deterioration due to the use of HF field was noted, though capacitance of grain boundaries due to secondary phases was significantly increased.

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The effects of crystallization parameters on the ionic conductivity of a lithium aluminum germanium phosphate glass–ceramic

Cited by 127 publications

References 13 publications

PREPARATION OF Li<sub>1.5</sub>Al<sub>0.5</sub>Ge<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> SOLID ELECTROLYTE BY SOL-GEL METHOD

PREPARATION OF Li<sub>1.5</sub>Al<sub>0.5</sub>Ge<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> SOLID ELECTROLYTE BY SOL-GEL METHOD

High Lithium-Ion-Conducting NASICON-Type Li1+xAlxGeyTi2−x−y(PO4)3 Solid Electrolyte

Improving NASICON Sinterability through Crystallization under High-Frequency Electrical Fields

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