TY - JOUR
T1 - Effect of the structural evolution on the ionic conductivity of Li-N-H system during the dehydrogenation
AU - Paik, Biswajit
AU - Matsuo, Motoaki
AU - Sato, Toyoto
AU - Qu, Liyuan
AU - Wolczyk, Anna Roza
AU - Orimo, Shin Ichi
N1 - Funding Information:
The work has been funded by the Japan Society for the Promotion of Science (JSPS) KAKENHI under Grant-in-aid Nos. 2522091, 26820311, and 26820313. L.Q. acknowledges the “Inter-departmental Doctoral Degree Program for Multi-dimensional Materials Science Leadersâ€(MD Program) and A.R.W. acknowledges European Marie Curie Actions under ECOSTORE Grant Agreement No. 607040 for supporting this work. Technical assistance from Ms. N. Warifune is also greatly acknowledged.
Publisher Copyright:
© 2016 Author(s).
PY - 2016/5/23
Y1 - 2016/5/23
N2 - On the way to transform lithium amide (LiNH2) into lithium imide (Li2NH) by releasing H2, the 1:1 molar mixture of LiNH2-LiH forms cubic (F m 3 m) non-stoichiometric complex hydride phases (Li1+ xNH2- x; 0 < x < 1) that co-exist with the tetragonal (I 4) LiNH2 and with the cubic (F d 3 m) Li2NH, respectively, at the early and at the advanced stage of the dehydrogenation. The change in LiNH2 → Li2NH may be viewed as a mechanism which continuously fills up the vacant Li sites of the tetragonal structure and, in a parallel process, transforms the anions [NH2]- → [NH]2-. The Li-N-H system, thus formed, by releasing >6 wt. % H2 can offer high Li-ionic conductivity (>10-4 S·cm-1 at room temperature) having an electrochemical stability window >5 V. The study suggests that the Li-N-H system may be a prospective electrolyte in the all-solid-state Li-ion battery, in addition to its use as a reversible hydrogen storage material.
AB - On the way to transform lithium amide (LiNH2) into lithium imide (Li2NH) by releasing H2, the 1:1 molar mixture of LiNH2-LiH forms cubic (F m 3 m) non-stoichiometric complex hydride phases (Li1+ xNH2- x; 0 < x < 1) that co-exist with the tetragonal (I 4) LiNH2 and with the cubic (F d 3 m) Li2NH, respectively, at the early and at the advanced stage of the dehydrogenation. The change in LiNH2 → Li2NH may be viewed as a mechanism which continuously fills up the vacant Li sites of the tetragonal structure and, in a parallel process, transforms the anions [NH2]- → [NH]2-. The Li-N-H system, thus formed, by releasing >6 wt. % H2 can offer high Li-ionic conductivity (>10-4 S·cm-1 at room temperature) having an electrochemical stability window >5 V. The study suggests that the Li-N-H system may be a prospective electrolyte in the all-solid-state Li-ion battery, in addition to its use as a reversible hydrogen storage material.
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U2 - 10.1063/1.4952601
DO - 10.1063/1.4952601
M3 - Article
AN - SCOPUS:84971509004
SN - 0003-6951
VL - 108
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 21
M1 - 213903
ER -