Preparation of (La, Li)TiO3 Dense Ceramics using Sol-Gel and Ion-Exchange Process

2002 ◽  
Vol 756 ◽  
Author(s):  
Seiichi Suda ◽  
Hiroyuki Ishii ◽  
Kiyoshi Kanamura
Keyword(s):  
Ion Exchange ◽  
Exchange Process ◽  
Sol Gel ◽  
Ionic Conductivities ◽  
Exchange Method ◽  
Ion Exchange Process ◽  
Li Ion ◽  
Lithium Ionic Conductor ◽  
Ion Exchange Method ◽  
Water Ratio

ABSTRACTLithium ionic conductor, (La, Li)TiO3, has synthesized with La/Li-TiO2 amorphous spheres that were obtained by sol-gel and ion-exchange method, and succeeding La3+/Li+ partial ion exchange. In this work, La /Li ion exchange conditions were mainly investigated in order to obtain dense (La, Li)TiO3 ceramics that have highly ionic conductivities. La +/Li+ ion exchange behavior was changed with ion-exchange solutions, and the Li/Ti ratio was increased with an increase in ethanol/water ratio in the solvent used for La3+/Li+ partial ion exchange. The use of an adequate ethanol/water ratio resulted in La/Li-TiO2 amorphous spheres with the composition of La/Li/Ti=0.54/0.34/1.00, and sintering of the spheres at 1200°C for 5 h in air led to dense (La, Li)TiO3 ceramics which exhibit the conductivity of 4.0 × 10-3 S cm-1 at 25°C.

scholarly journals The Li+, Na+ and K+ ion exchange reaction process on the surface of mixed oxide SiO2/TiO2/Sb2O5 surface prepared by the sol-gel processing method

2005 ◽  
Vol 30 (1) ◽  
pp. 51-58 ◽  
Author(s):  
C. U. Ferreira ◽  
J. E. Gonçalves ◽  
Y. V. Kholin ◽  
Y. Gushikem
Keyword(s):  
Ion Exchange ◽  
Mixed Oxide ◽  
Exchange Process ◽  
Sol Gel ◽  
Exchange Capacity ◽  
Processing Method ◽  
Exchange Property ◽  
Ion Exchange Process ◽  
Ion Exchange Reaction ◽  
Gel Processing

The porous mixed oxide SiO2/TiO2/Sb2O5 obtained by the sol-gel processing method presented a good ion exchange property and a high exchange capacity towards the Li+, Na+ and K+ ions. In the H+/M+ ion exchange process, the H+ / Na+ could be described as presenting an ideal character. The ion exchange equilibria of Li+ and K+ were quantitatively described with the help of the model of fixed tetradentate centers. The results of simulation evidence that for the H+ / Li+ exchange the usual situation takes place: the affinity of the material to the Li+ ions is decreased with increasing the degree of ion exchange. On the contrary, for K+ the effects of positive cooperativity, that facilitate the H+ / K+ exchange, were revealed.

scholarly journals Facile Synthesis of Lanthanum Strontium Cobalt Ferrite (LSCF) Nanopowders Employing an Ion-Exchange Promoted Sol-Gel Process

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1800
Author(s):  
Sri Rahayu ◽  
Adi Ab Fatah ◽  
Girish M. Kale
Keyword(s):  
Ion Exchange ◽  
Calcination Temperature ◽  
Cobalt Ferrite ◽  
Exchange Process ◽  
Sol Gel ◽  
Simultaneous Thermal Analysis ◽  
High Catalytic Activity ◽  
Ion Exchange Process ◽  
Lanthanum Strontium ◽  
Sol Gel Process

The perovskite nanopowders of lanthanum strontium cobalt ferrite (LSCF) have been synthesized using the alginate mediated ion-exchange process. This perovskite-based material is a promising cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs) due to its high electrical conductivity, low polarizability, high catalytic activity for oxygen reduction, enhanced chemical stability at an elevated temperature in high oxygen potential environment and high compatibility with the ceria based solid electrolytes. Phase pure LSCF 6428, LSCF 6455, and LSCF 6482 corresponding to La0.6Sr0.4Co0.2Fe0.8O3-δ, La0.6Sr0.4Co0.5Fe0.5O3-δ, and La0.6Sr0.4Co0.8Fe0.2O3-δ, respectively were successfully synthesized. The simultaneous thermal analysis (DSC-TGA) and XRD were used to determine the optimum calcination temperature for the dried ion-exchanged beads. Single phase nanopowders of LSCF (6428, 6455, and 6482) have been successfully prepared at a calcination temperature of 700 °C. The TGA analysis showed that every ton of LSCF-ALG dried beads can potentially yield 360 kg of LSCF nanopowders suggesting a potential for scaling-up of the process of manufacturing nanopowders of LSCF.

Formation mechanism of amorphous Na2O–SiO2 spheres prepared by sol–gel and ion-exchange method

2003 ◽  
Vol 321 (1-2) ◽  
pp. 3-9 ◽  
Author(s):  
Seiichi Suda ◽  
Tomokazu Yoshida ◽  
Kiyoshi Kanamura ◽  
Takao Umegaki
Keyword(s):  
Ion Exchange ◽  
Formation Mechanism ◽  
Sol Gel ◽  
Exchange Method ◽  
Ion Exchange Method ◽  
Sio2 Spheres

Effect of Cycles and Ion-Exchange on the Purification of Lithium Carbonate

2012 ◽  
Vol 443-444 ◽  
pp. 594-600
Author(s):  
Jian Wu ◽  
Yao Chun Yao ◽  
Yong Nian Dai ◽  
Bin Yang
Keyword(s):  
Ion Exchange ◽  
High Purity ◽  
Mother Liquor ◽  
Exchange Resin ◽  
Exchange Process ◽  
Lithium Carbonate ◽  
Ion Exchange Resin ◽  
Exchange Method ◽  
Ion Exchange Process ◽  
Industrial Grade

In this study, high-purity Li2CO3 was prepared by carbonation-decomposition and ion-exchange methods using the industrial-grade lithium carbonate, and the effect of cycles and ion-exchange of the mother liquor on purification was investigated. Results showed that the process of cycles can improve the purity and productivity of Li2CO3. The impurities (such as K, Na, Ca and Mg) could be removed in the process. The purity of product decreased and the impurity contents increased after 4 cycles. At the same time, the ion-exchange process by D412 resin was used to deeply remove the residual Ca and Mg after the simple carbonation-decomposition and cycle process. The comparison of different flowing speed of solution through the ion-exchange resin indicated that the low flowing speed was beneficial for the deep removal of the Ca and Mg. considering the problem of efficiency, the flowing speed of 10-20 ml/min was appropriate. The high purity and productivity of Li2CO3 indicated that the carbonation-decomposition method combining with the mother liquor cycles and ion-exchange method has a good perspective in the field of lithium carbonate purification.

Gamma titanium phosphate as an electrode material for Li-ion and Na-ion storage: performance and mechanism

2016 ◽  
Vol 4 (46) ◽  
pp. 18084-18090 ◽  
Author(s):  
Xinghua Xiang ◽  
Xiaocheng Li ◽  
Kongyao Chen ◽  
Yang Tang ◽  
Min Wan ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Low Voltage ◽  
Exchange Process ◽  
Large Radius ◽  
Capacity Retention ◽  
Storage Performance ◽  
Ion Exchange Process ◽  
Ion Storage ◽  
Li Ion ◽  
Performance And Mechanism

Layered G-TiP can store Li+ and Na+ ions via a local ion exchange process and redox reaction. Despite the large radius of Na+, G-TiP exhibits a higher structural tolerance upon (de)sodiation and a better capacity retention at low voltage.

Structural Reinvestigation of Alkali Hexatitanate

2011 ◽  
Vol 170 ◽  
pp. 208-212
Author(s):  
Kunimitsu Kataoka ◽  
Norihito Kijima ◽  
Hiroshi Hayakawa ◽  
Junji Akimoto
Keyword(s):  
Ion Exchange ◽  
Single Crystal ◽  
Molten Salt ◽  
Type Structure ◽  
Exchange Method ◽  
Space Group ◽  
X Ray ◽  
Structure Space ◽  
Li Ion ◽  
Ion Exchange Method

Na1.614Li0.386Ti6O13 Single crystal was synthesized by a Li+ ion-exchange method from Na2Ti6O13 single crystal in a molten salt of LiNO3. The obtained Na1.614Li0.386Ti6O13 single-crystal is colorless and has the shape of a rod. Na1.614Li0.386Ti6O13 crystallizes in the monoclinic tunnel type structure, space group C2/m, and lattice parameters a = 15.144(2) Å, b = 3.7492(5) Å, c = 9.162(2) Å and β = 99.0131(9)º. The structure was determined by a single-crystal X-ray study and refined to the conventional values of R = 0.0247 and wR = 0.0451 for 969 independent observed reflections.

Controlled synthesis of concentration gradient LiNi0.84Co0.10Mn0.04Al0.02O1.90F0.10 with improved electrochemical properties in Li-ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (63) ◽  
pp. 58173-58181 ◽  
Author(s):  
Weihua Chen ◽  
Yanyang Li ◽  
Juanjuan Zhao ◽  
Feifei Yang ◽  
Jianmin Zhang ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Electrochemical Properties ◽  
Concentration Gradient ◽  
Controlled Synthesis ◽  
Li Ion Batteries ◽  
Exchange Method ◽  
Gradient Materials ◽  
Li Ion ◽  
Ion Exchange Method

Ion exchange method is adopted to design the concentration gradient materials for Li-ion batteries.

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