Development of rechargeable lithium-bromine batteries with lithium ion conducting solid electrolyte

作者：Takemoto Koshin; Yamada Hirotoshi^*

来源：Journal of Power Sources, 2015, 281: 334-340.

DOI：10.1016/j.jpowsour.2015.02.015

• Lithium-bromine battery
• Solid electrolyte
• Interfacial resistance
• Quaternary ammonium bromide

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.

• 出版日期2015-5-1