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PhD position - Analysis and modeling the evolution of new active materials during the first charge-discharge cycles of a Li-Ion battery
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JOB DETAILS
Published: 2 months ago
Application deadline: Oct 31
Location: Grenoble, France
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PhD position - Analysis and modeling the evolution of new active materials during the first charge-discharge cycles of a Li-Ion battery

SL-DRT-19-0664

RESEARCH FIELD

Physical chemistry and electrochemistry

ABSTRACT

Facing the energy transition, the storage of energy is a major issue. However, it appears necessary to increase the battery storage capacity and one way could be the use of silicon in addition to graphite for the negative electrode of Li-ion accumulators. The development of accumulators based on these materials is however slowed by their instability, related to the swelling of silicon during the insertion of lithium. Thus, the understanding of the phenomena occurring during the first cycles of operation appear fundamental to master the operation over the long term. This thesis project aims to understand and model the mechanical behavior of these new silicon-graphite electrodes. It is based on 3 teams: in Saclay, we will synthesize custom materials: silicon nanoparticles, silicon / germanium alloys, core @ shell where the shell will be carbon. Commercial silicon / graphite materials will also be used as reference. The behavior of materials will be studied in Grenoble using a laboratory diffractometer allowing in-situ and operando analyzes and large instruments such as ESRF or SOLEIL. These measurements will provide information on the stress inside the silicon but also on the state of lithiation of the graphite and will allow the modeling of the electrochemistry of the insertion of the lithium in the silicon, in particular the dependence in time of the hysteresis, still poorly understood. The aim of the thesis is to build a physics-based battery model allowing: "simple" experiments of swelling measurements, electrical cell performance measurements, early-life and model cycling and modelization, to deduce the mechanical and electrochemical behavior of cells at the scale of grains and agglomerates. This, in order to predict the aging of cells in the long term, in relation with their mechanical properties.

LOCATION

Département de l’Electricité et de l’Hydrogène pour les Transports (LITEN)

Laboratoire Modélisation multi-échelle et suivi Performance

Grenoble

CONTACT PERSON

MATHIEU Benoit

CEA

DRT/LITEN/DEHT/LMP

CEA GrenobleDRT/LITEN/DEHT/SAMA/LMP17 rue des Martyrs38054 Grenoble CEDEX 09

Phone number: 04 38 78 18 44

Email: benoit.mathieu@cea.fr

UNIVERSITY / GRADUATE SCHOOL

Paris-Saclay

Sciences Chimiques: Molécules, Matériaux, Instrumentation et Biosystèmes (2MIB)

FIND OUT MORE

http://iramis.cea.fr/nimbe/Phocea/Membres/Annuaire/index.php?uid=herlin

http://liten.cea.fr/cea-tech/liten

http://iramis-i.cea.fr/nimbe/ledna/

START DATE

Start date on 01-10-2019

THESIS SUPERVISOR

HERLIN Nathalie

CEA

DRF/IRAMIS/NIMBE/LEDNA

IRAMIS/NIMBE/LEDNABât 522CEA Saclay911191 Gif-sur-Yvette Cedex

Phone number: 0169083684

Email: nathalie.herlin@cea.fr

« The age limit is 26 years for PhD offers and 30 years old for post-doc offers. »

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