Next Article in Journal
Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges
Previous Article in Journal
Towards Li-Ion Batteries Operating at 80 °C: Ionic Liquid versus Conventional Liquid Electrolytes
Article Menu
Issue 1 (March) cover image

Export Article

Open AccessCase Report
Batteries 2018, 4(1), 3;

Looking Deeper into the Galaxy (Note 7)

WMG, Warwick University, Coventry CV4 7AL, UK
Author to whom correspondence should be addressed.
Received: 20 November 2017 / Revised: 20 December 2017 / Accepted: 25 December 2017 / Published: 8 January 2018
Full-Text   |   PDF [4469 KB, uploaded 8 January 2018]   |  


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. View Full-Text
Keywords: Li-ion battery; safety; microstructure Li-ion battery; safety; microstructure

Graphical abstract

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).

Share & Cite This Article

MDPI and ACS Style

Loveridge, M.J.; Remy, G.; Kourra, N.; Genieser, R.; Barai, A.; Lain, M.J.; Guo, Y.; Amor-Segan, M.; Williams, M.A.; Amietszajew, T.; Ellis, M.; Bhagat, R.; Greenwood, D. Looking Deeper into the Galaxy (Note 7). Batteries 2018, 4, 3.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Batteries EISSN 2313-0105 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top