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Nanoscale strain mapping in battery nanostructures

  • Author(s): Ulvestad, A;
  • Cho, HM;
  • Harder, R;
  • Kim, JW;
  • Dietze, SH;
  • Fohtung, E;
  • Meng, YS;
  • Shpyrko, OG
  • et al.

Published Web Location

Coherent x-ray diffraction imaging is used to map the local three dimensional strain inhomogeneity and electron density distribution of two individual LiNi0.5Mn1.5O4-δ cathode nanoparticles in both ex-situ and in-situ environments. Our reconstructed images revealed a maximum strain of 0.4%. We observed different variations in strain inhomogeneity due to multiple competing effects. The compressive/tensile component of the strain is connected to the local lithium content and, on the surface, interpreted in terms of a local Jahn-Teller distortion of Mn 3+. Finally, the measured strain distributions are discussed in terms of their impact on competing theoretical models of the lithiation process. © 2014 AIP Publishing LLC.

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