Lithium conducting solid electrolyte Li1.3Al0.3Ti1.7(PO4)3 obtained via solution chemistry

Abstract

International audienceNaSICON-type lithium conductor Li1.3Al0.3Ti1.7(PO4)3 (LATP) is synthesized with controlled grain size and composition using solution chemistry. After thermal treatment at 850 °C, sub-micronic crystallized powders with high purity are obtained. They are converted into ceramic through Spark Plasma Sintering at 850-1000 °C. By varying the processing parameters, pellet with conductivities up to 1.6 × 10−4 S/cm with density of 97% of the theoretical density have been obtained. XRD, FEG-SEM, ac-impedance and Vickers indentation were used to characterize the products. The influence of sintering parameters on pellet composition, microstructure and conductivity is discussed in addition to the analysis of the mechanical behavior of the grains interfaces

Effects of preparation conditions on the ionic conductivity of hydrothermally synthesized Li1+Al Ti2-(PO4)3 solid electrolytes

“…The highest s(RT) of the LATP pellets produced by solid-state reaction in this study reaches about 2.64Â10 À4 S cm À1 for x = 0.3, which is slightly higher than those produced by the co-precipitation method [14,16], but lower than those reported by Aono et al [1,2], who achieved a maximum value of 7Â10 À4 S cm À1 . Moreover, the activation energy (E a ) can be calculated from the slope of the Arrhenius plot (log(sT) vs. 1000/T, see The present solid-state reaction was carried out under slightly different conditions of calcination at 850 C for 2 h and sintering at 900 C for 6 h, compared to 900 C for 2 h and 900 C for 2 h, respectively, in earlier reports [1,2].…”

“…In particular, an LATP particle has grain boundaries that deliver different Li + conduction paths from its bulk phase. More recently, various effective synthesis methods have been tried to prepare LATP with superior electrochemical properties; these methods include meltquenching [3][4][5], sol-gel [6][7][8][9][10][11], mechanical milling [12,13], and co-precipitation [14][15][16] techniques. Moreover, actual electrolytes using LATPs have been seen in many earlier examples of lithiumion [17][18][19][20][21][22], Li-air [23,24], and Li-sulfur batteries [25].…”

“…Moreover, actual electrolytes using LATPs have been seen in many earlier examples of lithiumion [17][18][19][20][21][22], Li-air [23,24], and Li-sulfur batteries [25]. For more information, Table 1 summarizes the LATP examples [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]26] prepared by various synthetic methods to obtain various values of room-temperature (RT) ionic conductivity (s) and activation energy (E a ), including the reported ionic conductivities (s b and s g ) and activation energies (E b and E g ) in both phases of bulk and grain boundary. Until now, the highest total s(RT) achievable was proved to be 1.3 Â 10 À3 S cm À1 from the LATP prepared by meltquenching at temperatures over 1400 C [3][4][5], but it is very dangerous to handle due to the extremely high temperature.…”

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

“…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].…”

Recent Advances in Inorganic Solid Electrolytes for Lithium Batteries

“…Great efforts have www.frontiersin.org been made for maximizing the ionic conductivity of LiA 2 IV (PO 4 ) 3 systems, especially LiTi 2 (PO 4 ) 3 . An increase in conductivity was observed when Ti 4+ was partially substituted by Al 3+ in Li 1+x Al x Ti 2−x (PO 4 ) 3 (LATP) (Key et al, 2012;Duluard et al, 2013;Morimoto et al, 2013) or when P 5+ was substituted by Si 4+ in Li 1+x+y Al x Ti 2−x Si y P 3−y O 12 (Fu, 1997;Tan et al, 2012). Conductivity was enhanced significantly to 3 × 10 −3 S cm −1 for Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 at room temperature.…”