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Practical high temperature (80 °C) storage study of industrially manufactured Li-ion batteries with varying electrolytes
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Genieser, Ronny, Loveridge, Melanie and Bhagat, Rohit (2018) Practical high temperature (80 °C) storage study of industrially manufactured Li-ion batteries with varying electrolytes. Journal of Power Sources, 386 . pp. 85-95. doi:10.1016/j.jpowsour.2018.03.050 ISSN 0378-7753.
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Official URL: http://dx.doi.org/10.1016/j.jpowsour.2018.03.050
Abstract
A previous study is focused on high temperature cycling of industrially manufactured Li-ion pouch cells (NMC-111/Graphite) with different electrolytes at 80 °C [JPS 373 (2018) 172–183]. Within this article the same test set-up is used, with cells stored for 30 days at different open circuit potentials and various electrolytes instead of electrochemical cycling. The most pronounced cell degradation (capacity fade and resistance increase) happens at high potentials. However appropriate electrolyte formulations are able to suppress ageing conditions by forming passivating surface films on both electrodes. Compared with electrochemical cycling at 80 °C, cells with enhanced electrolytes only show a slight resistance increase during storage and the capacity fade is much lower. Additionally it is shown for the first time, that the resistance is decreasing and capacity is regained once these cells are cycled again at room temperature. This is not the case for electrolytes without additives or just vinylene carbonate (VC) as an additive. It is further shown that the resistance increase of cells with the other electrolytes is accompanied by a reduction of the cell volume during further cycling. This behaviour is likely related to the reduction of CO2 at the anode to form additional SEI layer components.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
| Journal or Publication Title: | Journal of Power Sources | ||||||||
| Publisher: | Elsevier S.A. | ||||||||
| ISSN: | 0378-7753 | ||||||||
| Official Date: | 15 May 2018 | ||||||||
| Dates: |
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| Volume: | 386 | ||||||||
| Page Range: | pp. 85-95 | ||||||||
| DOI: | 10.1016/j.jpowsour.2018.03.050 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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