期刊
JOURNAL OF POWER SOURCES
卷 281, 期 -, 页码 334-340出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.02.015
关键词
Lithium-bromine battery; Solid electrolyte; Interfacial resistance; Quaternary ammonium bromide
资金
- Nagasaki University, Japan
Electrochemical performances of a prototype lithium bromine battery (LBB) employing a solid electrolyte is investigated. The discharge capacity decreases with repeating charge/discharge cycles. Electrochemical impedance analysis reveals that the capacity fading is mainly due to increase in the interfacial resistance between an aqueous active material solution and a solid electrolyte. Based on the results of symmetric cells and structural analysis of the surface of the solid electrolyte immersed in Br-2 solutions, it is suggested that a Lit-depletion layer is formed on the surface of the solid electrolyte as a result of contact with bromine. Addition of tetraethylammonium bromide (TEABr) depresses the interfacial resistance, which results in improved cycleability. LBB with 1.0 M LiBr and 0.25 M TEABr shows discharge capacity of 139 mAh/g-LiBr and Coulombic efficiency of 99.6% at 5th cycle. (C) 2015 Elsevier B.V. All rights reserved.
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