Fading analyses of commercial lithium-ion batteries with blended cathodes using synchrotron X-ray diffraction measurement and discharge curve analysis

Fading analyses of commercial lithium-ion batteries with blended cathodes using synchrotron X-ray diffraction measurement and discharge curve analysis
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使用同步加速器 X 射线衍射测量和放电曲线分析对具有混合阴极的商用锂离子电池进行褪色分析

DOI:
10.1016/j.jpowsour.2023.232893
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发表时间:
2023
影响因子:
9.2
通讯作者:
Kobayashi Takeshi
Kobayashi Takeshi
中科院分区:
工程技术2区
文献类型:
--
作者:
Betsuyaku Kiyoshi;Kobayashi Takeshi

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我们研究了商用混合正极锂离子电池的衰退行为。同步辐射X射线衍射测量揭示了混合阴极的组成材料和阴极的退化状态,由于颗粒开裂。新引入的颗粒模型的放电曲线分析,以解释电压的变化,由于颗粒开裂,这是不考虑在传统的放电曲线分析。在此,混合阴极和颗粒模型,以推进传统的放电曲线分析已经提出。除了基本模型外,我们还在我们的放电曲线分析代码VOLCALO(电压计算和优化)中实现了这些模型。与传统方法相比,混合阴极模型能更好地再现循环电池放电曲线的测量值,并获得由于降解而引起的混合重量比的变化。颗粒模型分析表明,考虑到颗粒尺寸的变化,由于颗粒开裂,在放电端附近的放电曲线的变化可以解释为增加的表面网站。
We investigated the fading behavior of commercial lithium-ion batteries with blended cathodes. Synchrotron X-ray diffraction measurements revealed the constituent materials of the blended cathode and the degradation state of the cathode due to particle cracking. A particle model was newly introduced to the discharge curve analysis in order to explain the voltage change due to particle cracking, which is not considered in the conventional discharge curve analyses. Herein, blended cathode and particle models to advance the conventional discharge curve analyses have been presented. We have implemented these models besides basic model within our discharge curve analysis code called VOLCALO (VOLtage CALculation and Optimization). The blended cathode model could reproduce the measured values of the discharge curve of cycled batteries better than the conventional method and obtain a change in blend weight ratio due to degradation. The particle model analysis revealed that considering the particle size change due to particle cracking, changes in the discharge curves near the discharge end could be explained by the increase of surface sites.
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