Impact of hydration on ion transport in Li₂Sn₂S₅·xH₂O

Abstract

The layered material Li2Sn2S5 forms two hydrated solid phases under increasing humidity. Intercalated water hydrates the interlayer Li+ ions and screens coulombic interactions, leading to a high in-plane mobility of both Li+ and H2O.

Fast divalent conduction in MB12H12·12H2O (M = Zn, Mg) complex hydrides: effects of rapid crystal water exchange and application for solid-state electrolytes

“…81,82 Furthermore, Zn conduction and the effect of hydration for cation conduction in the monovalent cation of Li have been attracting attention. [83][84][85] For instance, Joos et al determined the relationship between the number of H 2 O molecules and Li transport in Li 2 Sn 2 S 5 $nH 2 O and demonstrated that the transport rate considerably increased up to x z 8 with increasing hydration. 84 In complex hydride solid electrolytes, Takano et al discovered that hydrated LiBH 4 exhibited a considerably higher electrical conductivity (4.89 × 10 −4 S cm −1 ) than LiBH 4 at 45 °C.…”

“…[83][84][85] For instance, Joos et al determined the relationship between the number of H 2 O molecules and Li transport in Li 2 Sn 2 S 5 $nH 2 O and demonstrated that the transport rate considerably increased up to x z 8 with increasing hydration. 84 In complex hydride solid electrolytes, Takano et al discovered that hydrated LiBH 4 exhibited a considerably higher electrical conductivity (4.89 × 10 −4 S cm −1 ) than LiBH 4 at 45 °C. 85 As with these materials, the effects of H 2 O exchange in ZnB 12 H 12 $12H 2 O can be of signicance for Zn 2+ conduction.…”

Hydrated lithiumnido-boranes for solid–liquid hybrid batteries

“…31 Besides that, the presence of water in its crystal structure may also assist the Li + transport through the high-symmetry cubic polymorph. 41,69 It has already been reported that hydrated LiBH 4 can exhibit higher ionic conductivity than anhydrous LiBH 4 , and that enhancement of Li + conduction might be associated to the motion of structural water. 41 In a similar manner, the presence of ammonia molecules in hemi-ammine lithium borohydride (LiBH 4 $1/2NH 3 ) assists the migration of Li + through the crystal structure, increasing its ionic conductivity.…”

Explore the Ionic Conductivity Trends on B12H12 Divalent Closo-Type Complex Hydride Electrolytes

“…Closo -type complex hydrides (CTCHs) arise as a class of promising solid-state battery electrolytes because of their relatively facile cation diffusion compared to many other materials . Interestingly, recent experiments showed that adding neutral molecules into the lattice of CTCH electrolytes in the synthetic process can significantly promote cation diffusion, which in turn can promote the battery performance. − As summarized in Figure , though divalent CTCHs generally have larger diffusion activation energies than monovalent CTCHs, the addition of neutral molecules (in particular, water molecules) endows them with new hope by pressing their barriers to reach the upper limits of monovalent CTCHs. Nevertheless, the structure-performance relationships of these neutral molecules containing divalent CTCHs remained as a “black box”, as limited by the structural characterization techniques to date.…”