Nam, Kyung-Wan Bak, Seong-Min Hu, Enyuan Yu, Xiqian Zhou, Youngning Wang, Xiaojian Wu, Lijun Zhu, Yimei Chung, Kyung-Yoon Yang, Xiao-Qing 2024-01-20T13:01:32Z 2024-01-20T13:01:32Z 2021-09-01 2013-02-25 1616-301X https://pubs.kist.re.kr/handle/201004/128347 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-defined 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 LixNi0.8Co0.15Al0.05O2 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. English WILEY-V C H VERLAG GMBH NICKEL-OXIDE DERIVATIVES HIGH-ENERGY CATHODE TIME-RESOLVED XRD STRUCTURAL-CHANGES HIGH-POWER CHARGE COMPENSATION NEUTRON-DIFFRACTION STABILITY LI(NI0.8CO0.15AL0.05)O-2 PARTICLES 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 Article 10.1002/adfm.201200693 1 ADVANCED FUNCTIONAL MATERIALS, v.23, no.8, pp.1047 - 1063 ADVANCED FUNCTIONAL MATERIALS 23 8 1047 1063 scie scopus 000315200400011 2-s2.0-84874101357 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article NICKEL-OXIDE DERIVATIVES HIGH-ENERGY CATHODE TIME-RESOLVED XRD STRUCTURAL-CHANGES HIGH-POWER CHARGE COMPENSATION NEUTRON-DIFFRACTION STABILITY LI(NI0.8CO0.15AL0.05)O-2 PARTICLES lithium-ion batteries cathode materials safety X-ray absorption spectroscopy transmission electron microscopy (TEM)