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Understanding the limits of rapid charging using instrumented commercial 18650 high-energy Li-ion cells

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Amietszajew, Tazdin, McTurk, Euan, Fleming, Joseph and Bhagat, Rohit (2018) Understanding the limits of rapid charging using instrumented commercial 18650 high-energy Li-ion cells. Electrochimica Acta, 263 . pp. 346-352. doi:10.1016/j.electacta.2018.01.076

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Official URL: http://dx.doi.org/10.1016/j.electacta.2018.01.076

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Abstract

The charging rates of commercial high-energy Li-ion cells are limited by the manufacturer's specifications leading to lengthy charging times. However, these cells are typically capable of much faster charging, if one ensures that the thermal and electrode-specific voltage profiles do not exceed safety limits. Unfortunately, precise and in-situ measurements of these parameters have not been achieved to date without altering the operation of these cells. Here we present a method to assess the maximum current for commercial 18650s, using novel instrumentation methods enabling in operando measurements. We found the maximum charging current that could be safely applied to the evaluated high-energy cells is 6.7 times higher than the manufacturer-stated maximum. Subsequently a rapid-charging protocol was developed that leads to over five-fold reduction in charging times without compromising the safety limits of the cells. We anticipate our work to be a starting point for a more sophisticated understanding of commercial Li-ion cells through deployment of diverse in-situ sensor systems. This understanding will enable advances in battery materials science, thermal engineering and electrical engineering of battery technology. Furthermore, this work has the potential to help the design of energy storage systems for high performance applications such as motor racing and grid balancing.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Lithium ion batteries, Automobiles -- Motors -- Exhaust gas
Journal or Publication Title: Electrochimica Acta
Publisher: Pergamon
ISSN: 0013-4686
Official Date: 10 February 2018
Dates:
DateEvent
10 February 2018Published
12 January 2018Available
11 January 2018Accepted
Volume: 263
Page Range: pp. 346-352
DOI: 10.1016/j.electacta.2018.01.076
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
102490Innovate UKhttp://dx.doi.org/10.13039/501100006041
UNSPECIFIEDGreat Britain. Office for Low Emission VehiclesUNSPECIFIED

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