Reinvestigation of the ionic conductivity of a layered Li(BH3NH2BH2NH2BH3) salt†
A.
Prus, 
a
R.
Owarzany,
a
D.
Jezierski,
a
M.
Rzepecka,
a
W.
Grochala,
a
P.
Połczyński
*b
and
K. J.
Fijalkowski
*a
a
R.
Owarzany,
a
D.
Jezierski,
a
M.
Rzepecka,
a
W.
Grochala,
a
P.
Połczyński
*b
and
K. J.
Fijalkowski
*a
Abstract
We reinvestigated the ionic conductivity of lithium ions for Li(BH3NH2BH2NH2BH3), an ammonia borane derivative. The observed conductivity (4.0 × 10−6 S cm−1 at 65 °C) was found to be over four orders of magnitude higher than the value reported previously at 70 °C for this compound. Since very slow thermal decomposition of Li(BH3NH2BH2NH2BH3) progresses already below 100 °C, the previous results reported for 70–130 °C most likely correspond to decomposed samples. The activation energy for the lithium conductivity of polycrystalline layered Li(BH3NH2BH2NH2BH3) (57 kJ mol−1) resembles that of powdered Li3N (59 kJ mol−1), suggesting a similar mechanism of lithium diffusion in both materials.
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