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Tailoring the Thermodynamics and Kinetics of Mg–Li Alloy for a MgH 2 ‐Based Anode for Lithium‐Ion Batteries
Author(s) -
Kumar Sanjay,
Singh Anamika,
Kojima Yoshitsugu,
Dey Gautam Kumar
Publication year - 2017
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201600777
Subject(s) - dehydrogenation , hydrogen storage , alloy , lithium (medication) , kinetics , materials science , intermetallic , catalysis , inorganic chemistry , hydrogen , anode , chemical engineering , desorption , chemistry , electrode , metallurgy , organic chemistry , adsorption , medicine , physics , quantum mechanics , engineering , endocrinology
Understanding the lithiation–delithiation of the Mg–Li alloy during the absorption–desorption of hydrogen is essential for the development of Li‐ion batteries with MgH 2 as a negative electrode. Tuning the hydrogenation–dehydrogenation kinetics and thermodynamics of the Mg–Li alloy could also be helpful to develop a lightweight material for on‐board hydrogen‐storage applications. Single‐phase Li 3 Mg 7 (the highest % of lithium compound) was prepared by ball milling of LiH and MgH 2 as precursors of Li and Mg followed by dehydrogenation at 400 °C under dynamic vacuum conditions. The cyclic hydrogenation–dehydrogenation behavior of the intermetallic was studied in detail. During hydrogenation, Li 3 Mg 7 was delithiated to LiH and MgH 2 , whereas during dehydrogenation, LiH and MgH 2 were lithiated to form the Li 3 Mg 7 phase along with a Mg–Li solid solution. The hydrogenation–dehydrogenation kinetics of pristine Li 3 Mg 7 were found to be slow. The hydrogenation–dehydrogenation kinetics were remarkably improved by doping with ZrCl 4 as a catalyst. The activation energy and the thermodynamic parameters of the uncatalyzed and catalyzed alloy were evaluated, and the results were compared.