Combining In Situ Synchrotron X-Ray Diffraction and Absorption Techniques with Transmission Electron Microscopy to Study the Origin of Thermal Instability in Overcharged Cathode Materials for Lithium-Ion Batteries
- Combining In Situ Synchrotron X-Ray Diffraction and Absorption Techniques with Transmission Electron Microscopy to Study the Origin of Thermal Instability in Overcharged Cathode Materials for Lithium-Ion Batteries
- 남경완; 박성민; Enyuan Hu; Xiqian Yu; Youngning Zhou; Xiaojian Wang; Lijun Wu; Yimei Zhu; 정경윤; Xiao-Qing Yang
- cathode; lithium secondary batteries; in situ X-ray diffraction
- Issue Date
- Advanced functional materials
- VOL 23, NO 8, 1047-1063
- The thermal instability of the cathode materials in lithium-ion batteries is
an important safety issue, requiring the incorporation of several approaches
to prevent thermal runaway and combustion. Systematic studies, using
combined well-defi ned in situ techniques, are crucial to obtaining in-depth
understanding of the structural origin of this thermal instability in overcharged
cathode materials. Here time-resolved X-ray diffraction, X-ray
absorption, mass spectroscopy, and high-resolution transmission electron
microscopy during heating are combined to detail the structural changes in
overcharged LixN 0.8Co0.15A 0.05O2 and LixNi1/3Co1/3Mn1/3O2 cathode materials.
By employing these several techniques in concert, various aspects of the
structural changes are investigated in these two materials at an overcharged
state; these include differences in phase-distribution after overcharge, phase
nucleation and propagation during heating, the preferred atomic sites and
migration paths of Ni, Co, and Mn, and their individual contributions to
thermal stability, together with measuring the oxygen release that accompanies
these structural changes. These results provide valuable guidance for
developing new cathode materials with improved safety characteristics.
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