Electrochemical behavior of Li incorporation in Al in LiTFSI/KTf molten salt electrolyte

The electrochemical behavior of lithium incorporated in aluminum electrode in LiTFSI/KTf (lithium bis (trifluoromethylsulfonyl) amide/CF3SO3K) molten salt electrolyte was studied by a variety of electrochemical techniques including cyclic voltammetry, chronopotentiometry and chronoamperometry. The r...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2012-06, Vol.22 (6), p.1495-1500
Main Authors: TU, Xiao-hua, CHU, You-qun, MA, Chun-an
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Aluminum base alloys
aluminum electrode
coulombic efficiency
cyclic voltammetry
Electrodes
Lithium
molten salt
Molten salt electrolytes
Nucleation
nucleation process
Reduction (electrolytic)
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Summary:The electrochemical behavior of lithium incorporated in aluminum electrode in LiTFSI/KTf (lithium bis (trifluoromethylsulfonyl) amide/CF3SO3K) molten salt electrolyte was studied by a variety of electrochemical techniques including cyclic voltammetry, chronopotentiometry and chronoamperometry. The reduction reaction is found involving a nucleation process on the aluminum electrode. The results of chronopotentiometry indicate that the process of lithium incorporation in aluminum is smooth and uniform. The galvanostatic cycle experiments show that the coulombic efficiency is very low in the first cycle, which is mainly due to the “retention capacity” of Li–Al alloys. This characteristic is testified by the results of XRD and SEM. The results of chronoamperometry indicate that the incorporation of lithium into aluminum for the formation of α-phase Li–Al alloy is limited by its diffusion rate, with a measured diffusion coefficient of 1.8×10−10 cm2/s.
ISSN:1003-6326
DOI:10.1016/S1003-6326(11)61346-0