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Neuqua Valley High School ESRP 2015

Study of Amorphous Manganese in Li-Ion Batteries

Authors:

  • Students:
    • Deepankar Gupta
    • Casey Stowers
    • Jack Thomas
  • Teachers:
    • Daria Prawlocki
  • Mentors:
    • Mahalingam Balasubramanian (Argonne National Laboratory, Advanced Photon Source, X-ray Science Division)
    • Jason R. Croy (Argonne National Laboratory, Chemical Sciences and Engineering Division)
    • Brandon R. Long (Argonne National Laboratory, Chemical Sciences and Engineering Division)
    • Joong Sun Park (Argonne National Laboratory, Chemical Sciences and Engineering Division)

Advanced Photon Source Sector 20: Spectroscopy/PNC; Chemical Sciences and Engineering

Mnδ+ species play an important role in today’s Li-ion batteries but their associated activities and atomic environments are not fully understood.

Mn2+ can be dissolved from cathodes during battery operation, cross over to the anode, and deposit as Mn δ+, where δ has been proposed to be in the range of 0 (fully reduced Mn) to 4 (oxidized).

The main opposition against δ=0 (fully reduced Mn), even when the anode potential is very low, is the fact that the local structure of deposited Mn is not consistent with that expected for crystalline bulk Mn0.  However, there is no a priori reason to expect crossover Mn0, potentially generated in the Li-ion cell, to exist with the bulk, crystalline structure.

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