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Open Access Publications from the University of California

Visualizing the chemistry and structure dynamics in lithium-ion batteries by in-situ neutron diffraction

  • Author(s): Wang, XL;
  • An, K;
  • Cai, L;
  • Feng, Z;
  • Nagler, SE;
  • Daniel, C;
  • Rhodes, KJ;
  • Stoica, AD;
  • Skorpenske, HD;
  • Liang, C;
  • Zhang, W;
  • Kim, J;
  • Qi, Y;
  • Harris, SJ
  • et al.

Published Web Location

https://doi.org/10.1038/srep00747
Abstract

We report an in-situ neutron diffraction study of a large format pouch battery cell. The succession of Li-Graphite intercalation phases was fully captured under an 1C charge-discharge condition (i.e., charge to full capacity in 1 hour). However, the lithiation and dilithiation pathways are distinctively different and, unlike in slowing charging experiments with which the Li-Graphite phase diagram was established, no LiC 24 phase was found during charge at 1C rate. Approximately 75 mol. % of the graphite converts to LiC6at full charge, and a lattice dilation as large as 4% was observed during a charge-discharge cycle. Our work demonstrates the potential of in-situ, time and spatially resolved neutron diffraction study of the dynamic chemical and structural changes in real-world batteries under realistic cycling conditions, which should provide microscopic insights on degradation and the important role of diffusion kinetics in energy storage materials.

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