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Modifying Specific Li-Sites of LiNH2 by Na: Study of Multication Hydride Li3Na(NH2)4 in Electrochemical Applications
journal contribution
posted on 2017-10-19, 18:03 authored by Biswajit PaikOptimizing the electrochemical properties
of a solid-state electrolyte,
for an all-solid-state Li-ion secondary battery, requires understanding
the impact of structural modification on the relevant electrochemical
properties of the electrolyte. By replacing Li+, with Na+, from the specific lattice site (2c) of tetragonal LiNH2, a crystalline multication ionic hydride Li3Na(NH2)4 is formed which is ordered-variant of LiNH2 with modified anion and cation dynamics. In comparison to
LiNH2, the modified structure shows improved ionic conductivity
(∼10–5 S/cm at 373 K), and a wide electrochemical
operation window (−2 to +5 V) using a Li electrode. The presence
of Na+, on the specific lattice site of LiNH2, alters the stability of Li+ cations and increases the
number of the carrier ions in the multicationic structure of Li3Na(NH2)4. The study demonstrates the
possibility of structural engineering by tuning the site-specific
activity in multicationic, stable, lightweight, amide-based hydrides
for electrochemical energy-storage applications.