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Keywords:

  • lithium-ion batteries;
  • cathode materials;
  • safety;
  • X-ray absorption spectroscopy;
  • transmission electron microscopy (TEM)
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The structural origin of thermal instability of cathode materials, a critical safety issue for lithium-ion batteries, is studied systematically using a combination of various in situ synchrotron X-ray techniques and transmission electron microscopy. As Lijun Wu, Xiao-Qing Yang, and co-workers report on page 1047, an in-depth understanding of the thermal-decomposition behavior of overcharged cathode materials is obtained through this investigation.