Looking Deeper into the Galaxy (Note 7)

Melanie Loveridge, Guillaume Remy, Nadia Kourra, Ronny Genieser, Anup Barai, Mike Lain, Yue Guo, Mark Amor-Segan, Mark Williams, Tazdin Amietszajew, Mark Ellis, Rohit Bhagat, David Greenwood

Research output: Contribution to journalArticle

21 Citations (Scopus)
14 Downloads (Pure)

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.
Original languageEnglish
Article number3
Number of pages11
JournalBatteries
Volume4
Issue number1
DOIs
Publication statusPublished - 8 Jan 2018

Bibliographical note

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Keywords

  • Li-ion battery
  • safety
  • microstructure

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    Loveridge, M., Remy, G., Kourra, N., Genieser, R., Barai, A., Lain, M., ... Greenwood, D. (2018). Looking Deeper into the Galaxy (Note 7). Batteries, 4(1), [3]. https://doi.org/10.3390/batteries4010003