Evaluation of the thermal shock behaviour of tape cast ceramic substrates by means of lamp irradiation

Knoblauch, Volker; Schneider, Gerold A.; Böder, H.

doi:10.1016/s0955-2219(99)00069-2

Cited by 1 publication

(1 citation statement)

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“…from hardening of steel or thermal shock testing of advanced ceramics. [29][30][31][32] The radial symmetric temperature distribution with higher temperatures in the center results in radial and tangential compressive stresses in the core and tangential tensile stresses in the outer rim that constrains the thermal expansion of the core region. It is reasonable that the compressive stresses in the inner jelly roll provoke its buckling toward the rotation axis.…”

Section: Results From Battery Cross-sections Of Cycled Cells Without ...mentioning

confidence: 99%

A Mechanical Aging Mechanism in Lithium-Ion Batteries

Waldmann¹,

Gorse²,

Samtleben³

et al. 2014

J. Electrochem. Soc.

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137

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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 3.6-16.6C. 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.

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Section: Results From Battery Cross-sections Of Cycled Cells Without ...mentioning

confidence: 99%