Poster: The structural and electronic properties of anti-fluorite Li2X…

Presenter: Brahim Bahloul
Title: The structural and electronic properties of anti-fluorite Li2X (X = S and Te) compounds
Affiliation: Ecole Normale Supérieure de Bou-Saada, Algeria

Abstract

The structural and electronic properties of anti-fluorite Li2X (X=S and Te) compounds were investigated using the density functional theory. The exchange-correlation potential is treated by the generalized gradient approximation (GGA) of Perdew-Burke-Ernzerhof (PBE) and the local density approximation (LDA) of Teter–Pade (TP).
Our calculated lattice parameters at equilibrium volume are in good agreement with available experimental data and other theoretical calculations.
The electronic band structures and density of states were obtained. The anti-fluorite Li2S and Li2Te present an indirect band gap of 3.388 eV and 2.493 eV at equilibrium. The top of the valence bands reflects the p electronic character for both structures.

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Poster: Autonomous optimization of second use battery storage systems

Author: Bernhard Fäßler
Title: Autonomous optimization of second use battery storage systems
Affiliation: University of Agder

Abstract

Electric vehicles are becoming more and more popular. This trend does not only rely on governmental incentives, it is also due to technology development leading to increased driving range and lower battery costs, driven by ever increasing environmental concerns. Unfortunately, electric vehicle batteries lose usable capacity over time and usage and are normally replaced when they reach 80% if their initial capacity.
In parallel, the share of intermittent renewable sources, such as wind and solar, is growing rapidly which affects grid stability and power quality. Buffer storages are needed to compensate for imbalances between energy demand and generation where second use batteries could be a viable alternative to traditional solutions such as pumped storage hydro power plants.
The University of Agder is working, among other battery related research, on stationary, second use storage assembly possibilities and application dependent controllers to allow for autonomous storage operation.

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Poster: Enabling All-Carbon Dual-ion Batteries through Highly Concentrated Electrolytes

Authors: Antonia Kotronia
Title: Enabling All-Carbon Dual-ion Batteries through Highly Concentrated Electrolytes
Affiliation: Uppsala University

Abstract

Dual-ion batteries (DIBs) rely on the redox amphotericity of graphite which allows for intercalation of cations and anions into its structure. Exploiting this,  high-voltage (above 4.7 V vs. lithium) rechargeable batteries can be developed without using any transition metal-containing active materials. This cheap, safe and environmentally-friendly technology  needs, however, to overcome considerable challenges before commercialization. Most importantly, the development of DIBs is affected by capacity fading associated with graphite exfoliation upon anion intercalation and the lack of current collectors that can withstand corrosion at high operational voltages. This study attempts to tackle both issues by employing highly concentrated electrolytes with PF6-, TFSI- and FSI- anions. The impact of anion intercalation on the structure of graphite and the oxidative stability of Al current collectors in concentrated electrolytes are studied using electrochemical and spectroscopic techniques.

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Poster: A new operando cell for neutron diffraction on…

Authors: Andreas Østergaard Drejer (a), Daniel Risskov Sørensen (a,b), Michael Heere (b), and Dorthe Bomholdt Ravnsbæk (a)
Title: A new operando cell for neutron diffraction on Li-ion battery material
Affiliation: (a) Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, (b) Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München

Abstract

The use of operando diffraction has taken a major step forward, in no small part due to the increase in flux at large scale facilities such as synchrotrons and neutron spallation sources. While X-rays are absorbed by typical battery casings, which necessitates special designed cells, neutrons have a penetration depth large enough to probe the entirety of a battery cell. This has allowed measurements directly on commercial batteries, giving unique insights into the evolution of cell parameters and composition of the cathode and anode phase, but also showing Li-consumption by decomposition of the electrolyte and plating of lithium metal. In this work, we develop a new operando neutron diffraction battery cell, which allows easy measurement on a variety of different non-commercial cathode materials. The cell uses a Zr/Ti-alloy with negligible scattering strength to eliminate contributions from the casing. We present data on from the cell on the electrode materials LiFePO4 and LiVPO4F.

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Poster: The ACES (Across Continents Electric Vehicle Services) project

Presenter: Andreas Thingvad
Title: The ACES (Across Continents Electric Vehicle Services) project
Affiliation: DTU Elektro, Technical University of Denmark

Abstract

The ACES project  holistically investigate technical and economic system benefits and impacts by large scale electric vehicles integration in Bornholm, augmented by real usage patterns, grid data and field testing for across continents replicability.

A full scale penetration scenario of electrical vehicles at Bornholm is simulated in order to assess how new aggregating functionalities – both technically and economically – can support a successful integration of electric vehicles into the energy system.

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Poster: Amorphous iron phosphate thin films in Li-ion batteries

Author: Anders Brennhagen
Title: Amorphous iron phosphate thin films in Li-ion batteries
Affiliation: University of Oslo

Abstract

In this work, we have investigated amorphous thin films of Fe4(P2O7)3 and FePO4 as cathode materials in Li-ion batteries. The materials show very high power cababilities and good stability.

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Poster: Rapid cycling of Li-ion cells for cold climates

Authors: Alexander Smith and Rakel Wreland Lindström
Title: Rapid cycling of Li-ion cells for cold climates
Affiliation: Royal Institute of Technology, KTH

Abstract

To ensure electric vehicles as a convenient and viable transportation solution, battery lifetime must be improved by better understanding the conditions and signs of aging. Power-optimized cylindrical NMC-LMO/graphite Li-ion cells were cycled in sub-ambient and room temperatures at 1C and 3C rates over the full SOC range (0-100%). Conditions were selected to investigate aging in cold climates with increased risk for Li plating. Differential voltage analysis, differential thermal voltammetry, and electrochemical impedance spectroscopy were conducted in situ to study degradation.
Ambient cycling at 1C rate caused the earliest end-of-life (80% remaining capacity) after 2500 equivalent cycles. At 3C rate and 10°C, cells lasted longer; slower late-life degradation contributed to a lifespan of >3500 equivalent cycles. In all cases, loss of cyclable lithium was the dominant mode of capacity fade, confirmed by dV/dQ. Ongoing post mortem analysis will elucidate specific aging mechanisms.

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