论文标题
在超低频率下实现可充电电池的可靠且可重复的电化学阻抗光谱
Achieving Reliable and Repeatable Electrochemical Impedance Spectroscopy of Rechargeable Batteries at Extra-Low Frequencies
论文作者
论文摘要
需要技术来有效，准确地测量以外低频（通常低于10UHz）的可充电电池的阻抗，因为这些技术反映了实际使用和循环模式，并且它们在分数电池电路模型中的重要性变得越来越明显。主要障碍包括执行此类测量所需的时间，当在不同时间从相同的电池进行测量时，在阻抗值中“漂移”。此外，商业阻抗分析仪通常无法按照微赫兹的频率进行测量。我们在这里描述了我们在存在大信号“工作”电流的情况下使用可编程的两个二骨电源来提供多种小信号测量音调，并且我们使用这些数据以良好的精度和合理的时间来生成阻抗测量。
There is a need for techniques for efficient and accurate measurement of the impedance of rechargeable batteries at extra-low frequencies (ELFs, typically below 10uHz), as these reflect real usage and cycling patterns, and their importance in fractional battery circuit modeling is becoming increasingly apparent. Major impediments include the time required to perform such measurements, and `drift' in impedance values when measurements are taken from the same battery at different times. Moreover, commercial impedance analyzers are generally unable to measure at frequencies of the order of microhertz. We describe here our use of programmable two-quadrant power supplies to deliver multiple small signal measurement tones in the presence of large signal `working' currents, and our use of these data to generate impedance measurements with good precision and in reasonable time.
