Synergistic effect of Ga and Yb co-doping on the structure and ionic conductivity of Li7La3Zr2O12 ceramics

Improvement of the Li-ion conductivity and air stability of the Ta-doped Li7La3Zr2O12 electrolyte via Ga co-doping and its application in Li–S batteries

“…It is evident from these findings that there exists an optimal range for both Li vacancy concentration and Li-ion concentration to achieve high Li-ion conductivity, consistent with previously reported results. 23,60,61…”

“…It is evident from these ndings that there exists an optimal range for both Li vacancy concentration and Li-ion concentration to achieve high Li-ion conductivity, consistent with previously reported results. 23,60,61 LLZT pellets sintered at 1150 °C already exhibit a relatively high relative density of 94% with the primary resistance contribution coming from the bulk resistance. Despite already possessing a high bulk ionic conductivity of 7.98 × 10 −4 S cm −1 and total ionic conductivity of 7.68 × 10 −4 S cm −1 , the addition of a small amount of Ga can further enhance their bulk ionic conductivity.…”

Recent Strategies for Lithium-Ion Conductivity Improvement in Li7La3Zr2O12 Solid Electrolytes

“…The partial substitution of Li + and La 3+ ions in the LLZ structure was studied in works [ 99 , 100 , 101 , 102 ]. Sodhiya et al [ 99 ] used Al 3+ and Ba 2+ for co-doping LLZ on Li and La sublattices–Li 6.28+x Al 0.24 La 3−x Ba x Zr 2 O 12 (x = 0.0–0.3).…”

“…Li 6.38 Al 0.24 La 2.9 Ba 0.1 Zr 2 O 12 annealed at 1000 °C had the cubic structure, but a low conductivity value—4.6 × 10 −5 S/cm at 25 °C. Li + substitution by Ga 3+ and La 3+ by divalent and trivalent ions was presented in several works [ 100 , 101 , 102 ]. Li et al [ 100 ] studied the effect of Ga 3+ and Yb 3+ co-doping on the structure and ionic conductivity of LLZ—Li 6.4 Ga 0.2 La 3−x Yb x Zr 2 O 12 (x = 0–0.1).…”

Interfacial Modification of Ga-Substituted Li7La3Zr2O12 against Li Metal via a Simple Doping Method

“…Li 6.4– x Ga 0.2 La 3 Zr 2– x Sb x O 12 ( x = 0, 0.1, 0.2, 0.3, and 0.4) solid electrolytes were prepared by the traditional solid-state reaction method. ,, Stoichiometric amounts of LiOH·H 2 O (99%), La 2 O 3 (99.99%), ZrO 2 (99%), Ga 2 O 3 (99.99%), and Sb 2 O 5 (99%) were mixed and ball-milled with zirconia balls for 12 h in isopropanol in air. 10 wt % excess LiOH·H 2 O was added to compensate for the loss of lithium during synthesis.…”