A Mechanical Aging Mechanism in Lithium-Ion Batteries
A Mechanical Aging Mechanism in Lithium-Ion Batteries
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DOI：
10.1149/2.1001410jes
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发表时间：
2014
影响因子：
3.9
通讯作者：
T. Waldmann;S. Gorse;T. Samtleben;G. Schneider;V. Knoblauch;M. Wohlfahrt‐Mehrens
中科院分区：
文献类型：
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作者：
T. Waldmann;S. Gorse;T. Samtleben;G. Schneider;V. Knoblauch;M. Wohlfahrt‐Mehrens
采用五种不同类型的商用18650型锂离子电池，在不同的碳倍率下进行循环，并进行存储老化。x射线计算机断层扫描测量显示，在3.6-16.6 c的循环速率范围内，三种不同类型的无中心销的果冻卷的内部部分发生强烈变形。对于在1C循环的细胞，这种变形不太明显，而对于储存的细胞，这种变形完全没有。通过展开电极的死后分析和18650细胞的横断面扫描电镜成像，研究了对细胞容量损失的影响。为了研究胶辊变形的原因，我们在放电过程中对胶辊中部和电池表面进行了16℃的温度测量。最后，通过x射线计算机断层成像测试了两种不同细胞类型循环后中心销对果冻卷变形的影响。
Cycling at different C-rates, as well as storage aging is performed with five different types of commercial 18650-type Lithium-ion cells. X-ray computed tomography measurements show strong deformations of the inner part of the jelly rolls for three different cell types without center pin after cycling at rates in the range of 3.6–16.6 C. For cells cycled at 1C, this deformation is less pronounced, whereas it is totally absent for stored cells. The consequence on capacity loss of the cells was investigated by Post-Mortem analysis with unrolled electrodes, as well as scanning electron microscopy imaging with cross-sections of 18650 cells. In order to investigate the reason for the jelly roll deformation, we conducted in-operando temperature measurements in the middle of the jelly roll and at the cell surface during discharge with 16C for one selected cell type. Finally, the effect of a center pin on jelly roll deformation is tested by X-ray computed tomography imaging for two different cell types after cycling.