Solid Electrolyte Interphase : Can faster formation at lower potentials yield better performance?

Antonopoulos, Byron Konstantinos and Stock, Christoph and Maglia, Filippo and Hoster, Harry Ernst (2018) Solid Electrolyte Interphase : Can faster formation at lower potentials yield better performance? Electrochimica Acta, 269. pp. 331-339. ISSN 0013-4686

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Abstract

To make a Lithium Ion Battery (LIB) reliably rechargeable over many cycles, its graphite-based negative electrode requires the solid electrolyte interphase (SEI) as a protection layer. The SEI is formed through chemical and particularly electrochemical side reactions of electrolyte components in the first charging cycle(s) after manufacturing of a LIB. The SEI ideally serves two purposes: (i) act as a sieve permeable to Li ions but not to other electrolyte components and (ii) passivate the electrode against further electrolyte decomposition. Core element of conventional SEI formation is a lengthy, low-current galvanostatic charging step, which due to its time consumption contributes heavily to cell manufacturing costs. Here, we report on some non-conventional SEI formation protocols for composite carbon electrodes, inspired by recent experimental findings at smooth model electrodes. Acknowledging that the SEI forms in two main steps, taking place in a high-potential and a low-potential region, respectively, we demonstrate that less time spent in the high-potential region not only makes the process faster but even yields SEIs with superior kinetic properties. We tentatively explain this via basic rules of thin film growth and the role of grain boundaries for ion transport. We also report on the positive influence of multi-frequency potential modulations applied between high-potential and low-potential formation. Given that any new cell chemistry in principle requires its own tailor-made formation process, technologic success of future LIB cells will benefit from a systematic, well-understood toolbox of formation protocols. This paper is meant as a first step, highlighting potentially low-hanging fruits, but also flagging the demand for further systematic studies on model systems and on commercially manufactured cells.

Item Type:
Journal Article
Journal or Publication Title:
Electrochimica Acta
Additional Information:
This is the author’s version of a work that was accepted for publication in Electrochimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Electrochimica Acta, 269, 2018 DOI: 10.1016/j.electacta.2018.03.007
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1600/1603
Subjects:
?? sei formationli-ion batterypre-chargecomposite carbon electrodescyclic voltammetryelectrochemistryrenewable energy, sustainability and the environmentgeneral chemical engineeringchemical engineering(all) ??
ID Code:
123832
Deposited By:
Deposited On:
02 Mar 2018 10:28
Refereed?:
Yes
Published?:
Published
Last Modified:
25 Nov 2024 01:28