Ionic conductivity of Li1.3Al0.3−xScxTi1.7(PO4)3 (x=0, 0.1, 0.15, 0.2, 0.3) solid electrolytes prepared by Pechini process

On the influence of the cation vacancy on lithium conductivity of Li1+xRxTi2−x(PO4)3 Nasicon type materials

“…Li 1 + x R x Ti 2 − x (PO 4 ) samples (denoted hereafter LRTP), with R = Al, Sc, In, were prepared by heating stoichiometric mixtures of Li 2 CO 3 , (NH 4 ) 2 HPO 4 , R 2 O 3 and TiO 2 at increasing temperatures in the 573-1373 K interval, following the procedure described previously [14,16,17]. The composition of prepared samples covers x values between 0 and 0.3 in binary series and x values between 0 and 0.6 in ternary samples (Al = 0.3/structural formula), see Table 1.…”

“…When titanium is partially substituted by trivalent R cations (R = Al, Ga, In, Fe, Sc, etc.) lithium conductivity increases in a significant way [12][13][14][15][16][17][18][19]. This increment has been ascribed to the creation of vacant Li1 sites at the intersection of conduction pathways.…”

“…This increment has been ascribed to the creation of vacant Li1 sites at the intersection of conduction pathways. Among analyzed Li 1 + x Ti 2 − x R x (PO 4 ) 3 series [12,14,[16][17][18]20], the best conductivity was reported for x ≈ 0.3 in LAlTP samples, where Ti 4 + is partially substituted by Al 3+ (σ 300K N 10 − 3 S cm − 1 ).…”

New horizons for inorganic solid state ion conductors

“…134 (c) MEM-reconstructed negative nuclear density maps. 52 [122][123][124][125][126][127][128][129][130][131] In particular, a high lithium conductivity at room temperature, 7 Â 10 À4 S cm À1 was reported in the case of Li 1.3 R 0.3 Ti l.7 (PO 4 ) 3 (R = Al 3+ ), abbreviated as LATP. 123 Similar effects caused by trivalent cation doping at M sites are also observed in the LiGe 2 (PO 4 ) 3 phase and an ion conductivity of 2.4 Â 10 À4 S cm À1 can be achieved in well-known Li 1+x Al x Ge 2Àx (PO 4 ) 3 , abbreviated as LAGP.…”

Characterization of Na1.3Al0.3Zr1.7(PO4)3 solid electrolyte ceramics by impedance spectroscopy

“…Later on it was found that NASICON framework is suitable for Li + conduction: different compounds with general formula Li 1+ x M x R 2 − x (PO 4 ) 3 , (where M is the trivalent cation and R is the tetravalent cation) were created in order to achieve the best conditions for ionic migration [3][4][5][6][7][8][9][10][11][12]. The highest intragrain conductivities were found to be up to 0.4 S/m at room temperature for the system Li 1+ x Al x Ti 2 − x (PO 4 ) 3 [13,14]. Despite such a high lithium ionic conductivity the sodium analogs have not been so extensively studied.…”