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April 10, 2026ACS Energy Letters1 citations

Understanding Thermal Behavior of High-Ni Cathodes via XAS, XRD, and Mass Spectrometry

Structural Evolution and Thermal Behavior of High-Ni Cathodes: Coupled Operando XAS, XRD, and Mass Spectrometry Analysis

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Authors

YZYuying ZhangCWChao WangJZJihao Zhang

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Overview

Operando analysis reveals structural changes and oxygen release in Ni-rich cathodes, highlighting safety implications for batteries.

Key Points

  • The study aims to understand the thermal instability of Ni-rich cathodes in lithium-ion batteries under heating.
  • Operando analysis using X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and online mass spectrometry (OMS).
  • Investigation of thermally induced decomposition under electrolyte-free conditions.
  • Time-resolved observation of structural changes and oxygen release.
  • Significant oxygen release occurs before bulk phase transitions are detected.
  • Decreased lithium content at higher voltages (4.8 V) accelerates Ni reduction and structural instability.
  • Higher early stage oxygen release at 4.8 V compared to 4.3 V indicates a more significant thermal risk.

Cite This Study

Zhang et al. (2026) studied this question.

synapsesocial.com/papers/69d895486c1944d70ce062e1https://doi.org/10.1021/acsenergylett.6c00367
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