We present a vanadium redox flow battery with a tubular cell design which shall lead to a reduction of cell manufacturing costs and the realization of cell stacks with reduced shunt current losses. Charge/discharge cycling and polarization curve measurements are performed to characterize the single test cell performance. A maximum current density of 70 mAcm⁻² and power density of 142 Wl⁻¹ (per cell volume) is achieved and Ohmic overpotential is identified as the dominant portion of the total cell overpotential. Cycling displays Coulomb efficiencies of ≈95% and energy efficiencies of ≈55%. During 113 h of operation a stable Ohmic cell resistance is observed.

中文翻译：

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具有管状电池设计的钒氧化还原液流电池的性能

我们提出了一种具有管状电池设计的钒氧化还原液流电池，这将导致电池制造成本的降低以及实现具有减小的分流电流损耗的电池堆的实现。进行充电/放电循环和极化曲线测量以表征单个测试电池的性能。实现了70 mAcm ^-2的最大电流密度和142 Wl ^-1（每单元体积）的功率密度，并且欧姆超电势被确定为总电池超电势的主要部分。骑自行车显示库仑效率约为95％，能量效率约为55％。在运行113小时期间，观察到稳定的欧姆电池电阻。