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Looking deeper into the galaxy (note 7)
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Loveridge, Melanie, Remy, Guillaume , Kourra, Nadia, Genieser, Ronny, Barai, Anup, Lain, Mike J., Guo, Yue, Amor-Segan, Mark, Williams, Mark A., Amietszajew, Tazdin, Ellis, Mark, Bhagat, Rohit and Greenwood, David G. (2018) Looking deeper into the galaxy (note 7). Batteries, 4 (3). 3. doi:10.3390/batteries4010003
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Official URL: https://doi.org/10.3390/batteries4010003
Abstract
Li-ion cell designs, component integrity, and manufacturing processes all have critical influence on the safety of Li-ion batteries. Any internal defective features that induce a short circuit, can trigger a thermal runaway: a cascade of reactions, leading to a device fire. As consumer device manufacturers push aggressively for increased battery energy, instances of field failure are increasingly reported. Notably, Samsung made a press release in 2017 following a total product recall of their Galaxy Note 7 mobile phone, confirming speculation that the events were attributable to the battery and its mode of manufacture. Recent incidences of battery swelling on the new iPhone 8 have been reported in the media, and the techniques and lessons reported herein may have future relevance. Here we look deeper into the key components of one of these cells and confirm evidence of cracking of electrode material in tightly folded areas, combined with a delamination of surface coating on the separator, which itself is an unusually thin monolayer. We report microstructural information about the electrodes, battery welding attributes, and thermal mapping of the battery whilst operational. The findings present a deeper insight into the battery’s component microstructures than previously disseminated. This points to the most probable combination of events and highlights the impact of design features, whilst providing structural considerations most likely to have led to the reported incidences relating to this phone.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | T Technology > TJ Mechanical engineering and machinery | ||||||
| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||
| Library of Congress Subject Headings (LCSH): | Lithium ion batteries, Lithium ion batteries -- Safety measures | ||||||
| Journal or Publication Title: | Batteries | ||||||
| Publisher: | M D P I AG | ||||||
| ISSN: | 2313-0105 | ||||||
| Official Date: | 8 January 2018 | ||||||
| Dates: |
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| Date of first compliant deposit: | 14 August 2019 | ||||||
| Date of first compliant Open Access: | 14 August 2019 | ||||||
| Volume: | 4 | ||||||
| Number: | 3 | ||||||
| Article Number: | 3 | ||||||
| DOI: | 10.3390/batteries4010003 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access |
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