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Post-mortem analysis of calendar aged large-format lithium-ion cells: Investigation of the solid electrolyte interphase

Storch, Mathias and Hahn, Severin Lukas and Stadler, Jochen and Swaminathan, Ramanathan and Vrankovic, Dragoljub and Krupp, Carsten and Riedel, Ralf (2019):
Post-mortem analysis of calendar aged large-format lithium-ion cells: Investigation of the solid electrolyte interphase.
In: Journal of Power Sources, 4432019. Elsevier, p. 227243, ISSN 03787753, e-ISSN 1873-2755,
DOI: 10.1016/j.jpowsour.2019.227243,
[Online-Edition: https://www.sciencedirect.com/science/article/abs/pii/S03787...],
[Article]

Abstract

Although the growth of the solid electrolyte interphase is considered one of the most important degradation phenomena of lithium-ion cells, the mechanism is not yet fully understood. In this work, we present a detailed post-mortem analysis of calendar aged large-format graphite/Li(Ni1/3Mn1/3Co1/3)O-2-based lithium-ion cells. X-ray photoelectron spectroscopy depth profiling reveals a distinct coherence of the growth of the solid electrolyte interphase with the phases of the lithiated graphite. Since the graphite phases are in direct correlation with the state of charge and the anode potential, the thickness of the SEI resulting from calendar aging is determined by the storage state of charge. The composition of the SEI has been analyzed as mainly organic near to the electrolyte and more inorganic towards the carbon active material. The same dependency as of the state of charge on the SEI thickness is found for the capacity retention and for the amount of irreversibly lost lithium. Additionally, gas is formed during the aging period and trapped in between the electrodes, leading to associated inhomogeneous lithium plating.

Item Type: Article
Erschienen: 2019
Creators: Storch, Mathias and Hahn, Severin Lukas and Stadler, Jochen and Swaminathan, Ramanathan and Vrankovic, Dragoljub and Krupp, Carsten and Riedel, Ralf
Title: Post-mortem analysis of calendar aged large-format lithium-ion cells: Investigation of the solid electrolyte interphase
Language: English
Abstract:

Although the growth of the solid electrolyte interphase is considered one of the most important degradation phenomena of lithium-ion cells, the mechanism is not yet fully understood. In this work, we present a detailed post-mortem analysis of calendar aged large-format graphite/Li(Ni1/3Mn1/3Co1/3)O-2-based lithium-ion cells. X-ray photoelectron spectroscopy depth profiling reveals a distinct coherence of the growth of the solid electrolyte interphase with the phases of the lithiated graphite. Since the graphite phases are in direct correlation with the state of charge and the anode potential, the thickness of the SEI resulting from calendar aging is determined by the storage state of charge. The composition of the SEI has been analyzed as mainly organic near to the electrolyte and more inorganic towards the carbon active material. The same dependency as of the state of charge on the SEI thickness is found for the capacity retention and for the amount of irreversibly lost lithium. Additionally, gas is formed during the aging period and trapped in between the electrodes, leading to associated inhomogeneous lithium plating.

Journal or Publication Title: Journal of Power Sources
Volume: 443
Publisher: Elsevier
Uncontrolled Keywords: Lithium-ion battery; Calendar aging; Post-mortem analysis; X-ray photoelectron spectroscopy; Solid electrolyte interphase Ray Photoelectron-Spectroscopy; Aging Mechanisms; Graphite Anode; Gas Evolution; Electrochemical Characterization; Li electrodes; Sei-Formation; Cycle life; Batteries; Surface
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 14 Jan 2020 13:33
DOI: 10.1016/j.jpowsour.2019.227243
Official URL: https://www.sciencedirect.com/science/article/abs/pii/S03787...
Projects: German Federal Ministry of Economic Affairs and Energy of the Project DriveBattery2015, Grant Number 03ET6060F
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