A neutral pH aqueous biphasic system applied to both static and flow membrane-free battery

卷:56

Article

关键词: ENERGY;    STORAGE;    PERFORMANCE;    VANADIUM;    ANOLYTE;   

DOI  :  10.1016/j.ensm.2023.01.033

来源: SCIE

【 摘 要 】

Here, we present a new aqueous biphasic system (ABS) with near neutral pH and containing highly soluble organic/organometallic active species that avoids crossover due to the thermodynamic separation of active species. This ABS become the best example of Static Membrane-Free Battery with the highest maximum theoretical energy density (21.7 Wh L-1), enhanced coulombic efficiency (96%) and stable performance over 250 cycles. Moreover, this work assesses the process of the self-discharge stablishing for the first time a protocol to quantify this phenomenon that results in low coulombic efficiencies in membrane-free batteries. Remarkably, a radically new membrane-free flow-reactor was specifically designed to maintain a stable liquid-liquid interphase that allows the battery to operate under flowing conditions. This resulted in flow battery with a two-fold increase of power density, high coulombic efficiencies and excellent capacity retention over 100 cycles. This work demonstrates for the first time the feasibility of this biphasic electrolyte concept in a truly Membrane-free Flow Battery.

【 授权许可】

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