25/06/2019
The Human Resources Strategy for Researchers

PhD position: New lamellar materials as negative electrodes electrodes for Li, Na & K ions batteries

This job offer has expired


  • ORGANISATION/COMPANY
    CNRS
  • RESEARCH FIELD
    Chemistry
    Physics
    Technology
  • RESEARCHER PROFILE
    First Stage Researcher (R1)
  • APPLICATION DEADLINE
    16/07/2019 23:59 - Europe/Brussels
  • LOCATION
    France › AMIENS
  • TYPE OF CONTRACT
    Temporary
  • JOB STATUS
    Full-time
  • HOURS PER WEEK
    35
  • OFFER STARTING DATE
    01/10/2019

LRCS is a research team involving 40 permanent and 34 non-permanent staff members from about a dozen different nationalities. Our CNRS and Université de Picardie Jules Verne researchers are experts in materials synthesis, electrochemistry, organic chemistry, formulation, modelling… Our team performs its tasks thanks to a large array of state-of- the-art equipment for characterization (X-ray diffraction, electron microscopes, spectroscopy/spectrometry devices) and for prototyping (calendering machine, coater, 18650 winder…). All these fields which are essential to innovate in energy storage and conversion!

Silicon is the key anode material for Li-ion and possibly sodium batteries with theoretical capacities of 3590 mAh / g for Li15Si4 and 954 mAh / g for NaSi. Nevertheless, there are well-known locks such as the volume expansion (310% during the insertion of Li) or the low electronic conductivity resulting from limited kinetics and insertion of Na. In order to respond to these limitations, we have recently explored Si-based structures with a two-dimensional structure, the siloxenes, to direct the reaction with alkalis (Li, Na, K) to a topotactic insertion mechanism, less penalizing in terms of the integrity of the electrode and beneficial for the cyclability. It will be expanded to Sn, Ge and mixte 2D materials. The insertion/deinsertion mechanism will be deeply studied.
L. C. Loaiza, L. Monconduit, V. Seznec, J. Power Sources, 417 (2019) 99-107, https://doi.org/10.1016/j.jpowsour.2019.02.030.

The candidate will have to respond to the above problems:
1. Synthesize new M-ene materials (based on Si, Sn, Ge, and mixed) by mechanical grinding and heat treatment then acid attack (R-MgBr, R-OH, R-NH2) to obtain the lamellar compounds with flexible interfacial space and up to exfoliation.
2. Carry out the characterization of the initial materials by X-ray diffraction, thermal analyzes, IR, Raman, MET.
3. Prepare and optimize electrode formulations
4. Carry out electrochemical analyzes in Li, Na or K batteries (galvanostatic cycling, cyclic voltammetry, cycling behavior, polarization)
5. Identify the mechanisms involved using techniques such as X-ray diffraction (in and ex-situ), Raman (in and ex-situ), liquid and solid NMR (in and ex-situ), IR.

A Highly motivated candidate is looked for this PhD thesis. He/She must have or will obtain a Master diploma in Chemistry, Electrochemistry or Material Science. Knowledge in the field of batteries, battery materials as well as characterizations techniques such as IR, Raman, electrochemistry, XRD, microscopy will be appreciated.

Additional comments

This PhD will be in collaboration with ICG Montpellier and Dr. Laure Monconduit

website: https://www.lrcs.u-picardie.fr/en/

Web site for additional job details

Required Research Experiences

  • RESEARCH FIELD
    Chemistry
  • YEARS OF RESEARCH EXPERIENCE
    None
  • RESEARCH FIELD
    Physics
  • YEARS OF RESEARCH EXPERIENCE
    None
  • RESEARCH FIELD
    Technology
  • YEARS OF RESEARCH EXPERIENCE
    None

Offer Requirements

  • REQUIRED EDUCATION LEVEL
    Chemistry: Master Degree or equivalent
    Physics: Master Degree or equivalent
    Technology: Master Degree or equivalent
  • REQUIRED LANGUAGES
    FRENCH: Basic
Work location(s)
1 position(s) available at
Laboratoire de réactivité et chimie des solides
France
AMIENS

EURAXESS offer ID: 420998
Posting organisation offer ID: 9739

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