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首页> 外文期刊>Electrochimica Acta >A combined in situ monitoring approach for half cell state of charge and state of health of vanadium redox flow batteries
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A combined in situ monitoring approach for half cell state of charge and state of health of vanadium redox flow batteries

机译：半电池充电状态的原位监测方法和钒氧化铈流量电池的健康状况

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摘要

Efficient vanadium redox flow battery operation requires reliable half cell specific state of charge and capacity information at each point in time. This study uses long term correlations of electrolyte densities with negative half cell capacities and half cell potentials in Nernst equations for a joint in situ measurement approach. In principle, no ex situ reference data are needed for the calibration since a combination of Coulomb counting and half cell electrolyte potentials enables a self consistent calibration during battery operation cycles. By this way state of charge results of a negative half cell feasibility study are confirmed for long term data and extended to the positive half cell. The explicit consideration of H+ concentration and acid dissociation for the positive half cell leads to consistent half cell measurements with lower errors. Experiments have been carried out with two different cation exchange membranes achieving comparable measurement errors in the few per cent range. (C) 2020 Elsevier Ltd. All rights reserved.
机译：高效的钒氧化还原流量电池操作需要可靠的半电池特定的充电状态和每个时间点的容量信息。该研究使用电解质密度与负半电池容量的长期相关性和NERNST方程中的半电池电位以原位测量方法的关节。原则上，由于库仑计数和半电池电解质电位的组合能够在电池运行周期期间实现自一致校准，因此校准不需要EX原位参考数据。通过这种方式，对长期数据确认负半细胞可行性研究的充电结果并扩展到正半电池。对H +浓度和正半细胞的酸解离的明确考虑导致一致的半电池测量，误差较低。通过两种不同的阳离子交换膜进行了实验，在少数百分之下的范围内实现了可比测量误差。 （c）2020 elestvier有限公司保留所有权利。

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