Ex situ and In Situ structural investigation of Li+ staging in LixVOPO4-type electrodes for Li batteries
The present proposal deals with the precise investigation of the various crystalline forms of LixVOPO4 that can be obtained electrochemically through Li+ insertion or extraction into/from LiVOPO4. This material shows indeed an unprecedented succession of phase transitions upon Li+ insertion/extraction towards definite compositions that are still not resolved structurally. To fully understand this fascinating electrochemical system, into which possible charge ordering on vanadium might occur, we intend to perform two kinds of experiments at ILL: • Isolate / prepare intermediate LixVOPO4 compositions (~200-300 mg for each composition x = 0-0.5, 1, 1.5, 1.7, 2) through slow electrochemical cycling in order to perform high resolution acquisition on the diffractometer D2B. • Use this model system as a first example of insitu neutron diffraction experiments within the electrochemical cell under development in the frame of the recently awarded (starting Sept 2012) PhD-ILL grant of Matteo Bianchini.
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MASQUELIER Christian; ATEBA MBA Jean Marcel; BIANCHINI Matteo; CROGUENNEC Laurence and SUARD Emmanuelle. (2013). Ex situ and In Situ structural investigation of Li+ staging in LixVOPO4-type electrodes for Li batteries. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-21-1076
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