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Electrode/electrolyte interfaces in lithium and sodium batteries
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0003-4440-2952
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Lithium-ion batteries (LIB) and sodium-ion batteries (SIB) and their materials is today a large research area due to the practical need for efficient energy storage. SIBs show, compared to LIBs, unique electrochemical reactions that mechanistically need to be understood. The kind of materials that can host sodium ions are, for instance, structurally different from the negative and positive electrode materials for LIBs. Also interfacial reactions occurring between the electrode and the electrolyte are different from LIBs.

 

To understand the chemical properties of electrolyte/electrode interfaces in LIBs and SIBs is one of the core research activities at the Ångström Advanced Battery Centre (ÅABC), Uppsala University. It is at these interfaces, the solid-electrolyte interphase (SEI) on the anode and the cathode electrolyte interface (CEI) on the cathode, charge transfer reactions take place, unwanted side reactions might start and the stability of the interface also influence the thermal stability of the battery. Careful characterization is therefore needed as a base for creating new and more stable interfaces for prolonged battery life. In this presentation we will make a review of several studies we have performed combining electrochemical characterization with in-house and synchrotron-based photoelectron spectroscopy (such as hard X-ray Photoelectron Spectroscopy, HAXPES). We will primarily dwell on the difference in chemical composition of the SEI of anodes used in LIBs and SIBs, respectively. We will also give some examples of ways to improve cycle life: the role of the electrolyte salt, electrolyte additives, but also of ways to protect electrode particle surfaces.

 

We have investigated materials from three different categories of anodes: i.e. conversion, alloying, and insertion anodes. Our HAXPES results on Fe2O3 as a conversion anode material indicated that the SEI on Fe2O3 anode is thicker and more homogeneous in a SIB compared to that in an analogue Li-ion battery.1 We will discuss our work of silicon anodes for LIBs and we will discuss the dissolution of the SEI components in a SIB which is larger than for a LIB2. We will discuss the results which show that the SEI on a carbonacous anode in a SIB is inferior to that of the LIB counterpart.

 

The interfaces of positive electrodes are also important. Often corrosion products will form during battery cycling leading to metal dissolution and poisoning of the negative electrode. We will also here compare the interfaces of Ni- and Mn-based oxide cathodes for LIBs and SIBs3.

.

 

References:

[1] B. Philippe; M. Valvo; F. Lindgren; H. Rensmo; K. Edström, Chem. Mater. 2014, 26, 5028–5041.

[2] R. Mogensen, D. Brandell, R. Younesi, ACS Energy Lett., 2016, 1, 1173–1178.

[3] S. Doubaji, B. Philippe, I. Saadoune, M. Gorgoi, T. Gustafsson, A. Solhy, Mario Valvo, H. Rensmo, K. Edström. ChemSusChem, 2916, 9, 97-108.

 

Place, publisher, year, edition, pages
2017.
Keyword [en]
Interface SEI Li-ion battery Na-ion battery
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-337511OAI: oai:DiVA.org:uu-337511DiVA, id: diva2:1169880
Conference
ISE 68th Annual Meeting - International Society of Electrochemistry
Funder
StandUp
Available from: 2017-12-30 Created: 2017-12-30 Last updated: 2017-12-30

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