Cho Jun-Ho, Thenaisie Guillaume, Park Cheol-Hui, Lee Sang-Gug
KAIST, 291 Daehak-ro Yuseong-Gu, Daejeon 34141, Korea.
MethodsX. 2020 Aug 31;7:101052. doi: 10.1016/j.mex.2020.101052. eCollection 2020.
This work presents the method and apparatus for the reproduction of the electrode-entropy differentiation approach which provides a tool to nondesctructively determine the contribution of each electrode to the battery total entropy by performing a comparative study with another battery which shares the same composition for only one of its electrodes (semi-similar types). The 2 cells must go through the same aging process so the proposed method can be applied as follow. Firstly, an optional pre-processing step is performed, followed by linear regression between capacity loss and entropy evolution over the full SOC range. Then, a correlation is computed for each SOC value between the entropy evolution of the two cells. The result of that correlation shows at which SOC the evolution of the two cells is similar. Postulating that half-cells of the same chemistry going under the same aging conditions age the same way, the common-mode highlighted by the correlation is the SOC-domain at which the entropy of the common half-cell is dominating. This method allows improves prior art by removing the need for custom-made half-cells of the same battery composition. The feasibility of the electrode-entropy differentiation methods is postulated, and the method is detailed. A validation study is performed on a set of batteries and the method feasibility is confirmed by the results obtained. This paper:•Demonstrates the feasibility of extracting the entropy from the comparative study between the subject cell and a reference.•Includes a validation test.•Suggest application of the method in the field of electrodes diagnosis.
这项工作介绍了一种用于重现电极-熵分化方法的方法和装置，该方法通过与另一个仅一个电极成分相同（半相似类型）的电池进行比较研究，提供了一种无损确定每个电极对电池总熵贡献的工具。这两个电池必须经历相同的老化过程，因此所提出的方法可以如下应用。首先，执行一个可选的预处理步骤，然后在整个SOC范围内对容量损失和熵演化进行线性回归。然后，针对两个电池的熵演化，计算每个SOC值的相关性。该相关性的结果显示了两个电池在哪个SOC时演化相似。假设相同化学组成的半电池在相同老化条件下以相同方式老化，相关性突出显示的共模就是共半电池熵占主导的SOC域。该方法通过消除对相同电池组成的定制半电池的需求改进了现有技术。假设了电极-熵分化方法的可行性，并详细介绍了该方法。对一组电池进行了验证研究，所得结果证实了该方法的可行性。本文：•证明了从受试电池与参考电池的比较研究中提取熵的可行性。•包括一项验证测试。•建议将该方法应用于电极诊断领域。
