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请帮忙翻译以下文字：Their impedance was determined by altering the current passing through the cell in a stepwise manner while simultaneously recording the voltage at the cell’s terminals (gal-vanostatic regime) and subsequently subjecting pulses of current and voltage to a Fourier transform。 As the setup ensured a voltage compensation at the terminals, the relative error of measurements was reduced to 0.1%.When taking measurements, the capacity of each cell diminished by no greater than 0.05% of the nominal value. To reduce the effect of the passive film at the lithium anode, a “pulse” of current (up to 900 s in length,amplitude 50 mA) was passed through the cell before taking each measurement. After each measurement the cell was discharged by short-circuiting it across a 0.3–0.32-kohm resistor. The discharge time was ~24 h. The impedance characteristics were monitored after each discharge, without applying the preliminary “pulse.”After storing the cells for 80 days, their impedance characteristics were determined once again, but now using the preliminary current pulse. 这段话的大意及重点是要确定实验步骤，其中有重点翻译的文字为：To reduce the effect of the passive film at the lithium anode, a “pulse” of current (up to 900 s in length,amplitude 50 mA) was passed through the cell before taking each measurement. After each measurement the cell was discharged by short-circuiting it across a 0.3–0.32-kohm resistor. The discharge time was ~24 h. The impedance characteristics were monitored after each discharge, without applying the preliminary “pulse.”After storing the cells for 80 days, their impedance characteristics were determined once again, but now using the preliminary current pulse. 我的理解如下：为减小钝化膜对锂阳极的影响，使用900s，50mA的大电流脉冲通过电池，在测量前，在每次测量之后，使用0.3–0.32-kohm的电阻进行恒阻放电，放电时间24小时，阻抗的测量在每次放电之后，没有使用电流脉冲。在电池储存80天后，它的阻抗特性就再次被确定下来，但是现在使用电流脉冲。 问题在于:作者说：每次测量前进行大电流脉冲，然后测量，然后再进行短路恒阻放电，放电24小时，但是又说阻抗测试在每次放电后，没有使用大电流脉冲。接着说电池储存80天后，阻抗特性再次确定，但是现在使用预先的大电流脉冲。 这个过程很难理解。 希望高人给出正确的步骤解释，非常感谢！ |
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