Preparation of Li7La3(Zr2−,Nb )O12 (x= 0–1.5) and Li3BO3/LiBO2 composites at low temperatures using a sol–gel process

Rosero-Navarro, Nataly Carolina; Yamashita, Taira; Miura, Akira; Higuchi, Mikio; Tadanaga, Kiyoharu

doi:10.1016/j.ssi.2015.06.015

Cited by 67 publications

(47 citation statements)

References 22 publications

(59 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is a marked enhancement compared to the 58% density of pure LLZ. However, a sintered density of 77% is still somewhat lower than other reported results, 23) which suggests that further research may be needed in this respect. Figure 4 presents the XRD patterns of the LLZ-LBO composites with different LBO contents after sintering at 1100 o C, and clearly shows the main LLZ cubic garnet phase.…”

Section: Resultscontrasting

confidence: 61%

Functional Li-M (Ti, Al, Co, Ni, Mn, Fe)-O Energy Materials

Kim¹,

Shin²,

Ko³

et al. 2017

J. Korean Ceram. Soc

View full text Add to dashboard Cite

In this study, we investigate the effect of the Li 3 BO 3 additive on the densification and ionic conductivity of garnet-type Li 7-La 3 Zr 2 O 12 solid electrolytes for all-solid-state lithium batteries. We analyze their densification behavior with the addition of Li 3-BO 3 in the range of 2-10 wt.% by dilatometer measurements and isothermal sintering. Dilatometry analysis reveals that the sintering of Li 7 La 3 Zr 2 O 12 -Li 3 BO 3 composites is characterized by two stages, resulting in two peaks, which show a significant dependence on the Li 3 BO 3 additive content, in the shrinkage rate curves. Sintered density and total ion conductivity of the system increases with increasing Li 3 BO 3 content. After sintering at 1100 .

show abstract

Section: Resultscontrasting

confidence: 61%

Functional Li-M (Ti, Al, Co, Ni, Mn, Fe)-O Energy Materials

Kim¹,

Shin²,

Ko³

et al. 2017

J. Korean Ceram. Soc

View full text Add to dashboard Cite

show abstract

“…On the other hand, the reduction of Li3BO3 content leads to the decrease, circa of 10%, of relative density. Higher content of Li3BO3 could create an unfavorable effect producing the drop of the Li-ion conductivity since the Li-ion 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 8 conductivity of Li3BO3 is two orders of magnitude lower than that of the LLZ garnet [15,18] [18,14].…”

Section: Resultsmentioning

confidence: 99%

“…Li3BO3 [18] and Al2O3 (1 μm, 99.99% High Purity Chemicals) were added to the calcined powder of LLCZT by hand-milling in an agate mortar. The evaluated additive concentrations of Li3BO3 were 0.70, 0.75, and 0.80 moles (molar ratio of Li3BO3 to LLCZT).…”

Section: Preparation Of Pelletsmentioning

confidence: 99%

“…Li-ion conductivity of Li6.625La3Zr1.625Ta0.375O12 sintered at 1000 °C (24 h) with 29 mol% Al [12] reaches 5 × 10 -4 S/cm. Other compounds used as sintering additives include Li2O, Li3BO3, Li3PO4 and Li4SiO4 [13][14][15][16][17][18]. These materials act as binder between the garnet particles during the sintering treatment by the formation of liquid phases at low temperatures, reducing the grain boundary resistance and improving the Li-ion conductivity pathway.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Optimization of Al2O3 and Li3BO3 Content as Sintering Additives of Li7−x La2.95Ca0.05ZrTaO12 at Low Temperature

Rosero-Navarro

Miura

Higuchi

et al. 2016

Journal of Elec Materi

View full text Add to dashboard Cite

Simultaneous effect of Al2O3 and Li3BO3 addition on sintering behavior and Li-ion conductivity of Li7-xLa2.95Ca0.05ZrTaO12 (LLCZT) garnet electrolyte sintered at 900 °C (10 h) is evaluated. Crystal phase and microstructure of the different composites were evaluated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Electrical properties of the composites with high relative densities (95 %) were examined by impedance spectroscopy (EIS). Cubic phase was formed for LLCZT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

show abstract

“…At room temperature (RT), cubic structure is unstable and tends to change into tetragonal structure. With doping of alien elements, cubic structure can be stabilized at RT with a total conductivity of 10 -6 -10 -3 S cm -1 [5][6][7][8][9][10][11] . On the contrary, the total conductivity for tetragonal LLZO prepared is about two orders lower about 10 -7 -10 -6 S cm -1 with a relative density of 60-73% [10,12,13] .…”

Section: Introductionmentioning

confidence: 99%

Effect of extra Li content on the property of tetragonal Li7La3Zr2O12 solid electrolyte prepared by auto-consolidation method

Zhao¹,

Cao²,

Jin³

et al. 2017

Proceedings of the 2017 5th International Conference on Machinery, Materials and Computing Technology (ICMMCT 2017)

View full text Add to dashboard Cite

Abstract. For all-solid-state lithium ion battery, Li 7 La 3 Zr 2 O 12 (LLZO) is a unique solid electrolyte possessing both high total ionic conductivity and stability against Li. As to conventional preparation methods, there is a stereotype that higher density always comes from higher pressure enforced upon the LLZO pellets. A different way called "auto-consolidation" was provided by us. Without the demand of pressing operations, the preparation process is greatly simplified. The surface tension of liquid Li 2 O at sintering temperature is the key factor for samples to consolidate. In this paper, the effect of extra Li content (0-25%) on the property of tetragonal LLZO was studied. Results show that only when the extra Li content reaches up to 10%, can dense tetragonal LLZO be gained. The optimized extra content value is about 15% with a relative density about 93% and a total conductivity of 5.6×10-5 S cm -1 at 30 o C, which is the highest one for tetragonal LLZO in reported issues, about two times higher than that prepared by hot-pressing method. At 30-100 o C, the activation energies for total conductivity are about 0.30~0.42 eV atom -1 , decreasing with the increasing of extra Li content, which is slightly lower than the previous reported values. This work suggests a simple and reliable route for the preparation of ceramic solid electrolytes.

show abstract

Preparation of Li7La3(Zr2−,Nb )O12 (x= 0–1.5) and Li3BO3/LiBO2 composites at low temperatures using a sol–gel process

Cited by 67 publications

References 22 publications

Functional Li-M (Ti, Al, Co, Ni, Mn, Fe)-O Energy Materials

Functional Li-M (Ti, Al, Co, Ni, Mn, Fe)-O Energy Materials

Optimization of Al2O3 and Li3BO3 Content as Sintering Additives of Li7−x La2.95Ca0.05ZrTaO12 at Low Temperature

Effect of extra Li content on the property of tetragonal Li7La3Zr2O12 solid electrolyte prepared by auto-consolidation method

Contact Info

Product

Resources

About