Probing the Roles of Polymeric Separators in Lithium-Ion Battery Capacity Fade at Elevated Temperatures

Chen, Jianchao; Yan, Yongda; Sun, Tao; Qi, Yue

doi:10.1149/2.0351409jes

Cited by 31 publications

(16 citation statements)

References 29 publications

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“…For the selected internal short circuit model, the mechanical failure of the separator is the primary reason for the short circuit [5,29,37,40,47]. The short circuit resistances of the cathode, anode, and nail are configured in series.…”

Section: Short Circuit Modelingmentioning

confidence: 99%

Integrated computation model of lithium-ion battery subject to nail penetration

2016

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Section: Short Circuit Modelingmentioning

confidence: 99%

Integrated computation model of lithium-ion battery subject to nail penetration

2016

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“…The pores of the PP separator started to close and the membrane began to shrink at temperatures above 90 1C, causing strain, particularly in the transverse direction. 41 Subsequently, the separator started to melt at 165 1C. Here, snapping of the separator is likely to have been caused by a combination of temperature-induced strain and softening at elevated temperatures.…”

Section: Propagation Of Thermal Runawaymentioning

confidence: 99%

Characterising thermal runaway within lithium-ion cells by inducing and monitoring internal short circuits

Finegan

Darcy

Keyser

et al. 2017

Energy Environ. Sci.

226

132

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a Lithium-ion batteries are being used in increasingly demanding applications where safety and reliability are of utmost importance. Thermal runaway presents the greatest safety hazard, and needs to be fully understood in order to progress towards safer cell and battery designs. Here, we demonstrate the application of an internal short circuiting device for controlled, on-demand, initiation of thermal runaway. Through its use, the location and timing of thermal runaway initiation is pre-determined, allowing analysis of the nucleation and propagation of failure within 18 650 cells through the use of high-speed X-ray imaging at 2000 frames per second. The cause of unfavourable occurrences such as sidewall rupture, cell bursting, and cell-to-cell propagation within modules is elucidated, and steps towards improved safety of 18 650 cells and batteries are discussed. Broader contextFrom portable electronics to grid-scale storage, high energy density Li-ion batteries are ubiquitous in today's society. Such cells can and do fail, sometimes catastrophically, releasing large amounts of energy. To facilitate safer and more reliable cell designs, the importance of understanding failure mechanisms of Li-ion cells is widely recognised. Here, we demonstrate the application of a novel device that is capable of generating an internal short circuit within commercial cell designs, on-demand, and at a predetermined location. This enables us to test more effectively the ability of safety devices of cells and modules to withstand 'worst-case' failure scenarios. By combining the use of this device with high-speed X-ray imaging at 2000 frames per second, we characterise for the first time the initiation and propagation of thermal runaway from a known location within a Li-ion cell. The insights achieved in this study are expected to guide the design and development of safer and more reliable Li-ion cells.

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“…The separator can be thermal-shrinkage and expand with an electrolyte. A commercial polyethylene (PE)-polypropylene (PP)-mixed polymeric separator, the Celgard 2325, contracts significantly by from 1.5% at 50 • C to 6% at 90 • C in the machine direction [56]. At a high temperature 140 • C for 0.5 h, a pristine PE separator shrinks by 94% [57].…”

Section: Electrode Wetting and Separatormentioning

confidence: 99%

In Situ Stress Measurement Techniques on Li-ion Battery Electrodes: A Review

Cheng

Pecht

2017

Energies

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Li-ion batteries experience mechanical stress evolution due in part to Li intercalation into and de-intercalation out of the electrodes, ultimately resulting in performance degradation. In situ measurements of electrode stress can be used to analyze stress generation factors, verify mechanical deformation models, and validate degradation mechanisms. They can also be embedded in Li-ion battery management systems when stress sensors are either implanted in electrodes or attached on battery surfaces. This paper reviews in situ measurement methods of electrode stress based on optical principles, including digital image correlation, curvature measurement, and fiber optical sensors. Their experimental setups, principles, and applications are described and contrasted. This literature review summarizes the current status of these stress measurement methods for battery electrodes and discusses recent developments and trends.

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Probing the Roles of Polymeric Separators in Lithium-Ion Battery Capacity Fade at Elevated Temperatures

Cited by 31 publications

References 29 publications

Integrated computation model of lithium-ion battery subject to nail penetration

Integrated computation model of lithium-ion battery subject to nail penetration

Characterising thermal runaway within lithium-ion cells by inducing and monitoring internal short circuits

In Situ Stress Measurement Techniques on Li-ion Battery Electrodes: A Review

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