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DCS & DCA – Battery – Application Note 57

Latest updated: May 6, 2020

Introduction

As introduced in the application note #40 [1] the Differential Capacity Analysis (DCA) is a powerful tool to understand and investigate degradation mechanisms in lithium-ion batteries. The DCA tool processes battery cycling data obtained with a constant potential recording parameter (dE). For data obtained with a constant time recording parameter (dt), a new analysis tool, Differential Coulometry Spectroscopy tool (DCS) was developed. This tool extends and completes the process tools range available in EC-Lab®/BTLab® software. The DCS tool is a convenient statistical method to investigate electrochemical behavior and the performance of rechargeable batteries based on intercalation materials. The method consists in converting a raw battery cycling data (voltage profile) into a histogram. The histogram is the distribution of the number of measurement data over cell voltage. The number of measurement point ni is counted for each voltage step Ei. Since the recording condition is a constant time difference and the applied current is constant, the number of points corresponds to a charge/discharge difference. This number corresponds to the height of the histogram bar positioned at the abscissa Ei. The DCS plot corresponds to the envelope of the histogram vs. potential

 

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