TY - JOUR
T1 - 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
AU - Nam, Kyung Wan
AU - Bak, Seong Min
AU - Hu, Enyuan
AU - Yu, Xiqian
AU - Zhou, Youngning
AU - Wang, Xiaojian
AU - Wu, Lijun
AU - Zhu, Yimei
AU - Chung, Kyung Yoon
AU - Yang, Xiao Qing
PY - 2013/2/25
Y1 - 2013/2/25
N2 - 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 Li xNi0.8Co0.15Al0.05O2 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. The structural origin of the thermal instability of cathode materials, which is 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. The in-depth understanding of the thermal decomposition behavior of overcharged cathode materials provides valuable guidance for developing new cathode materials with improved safety characteristics.
AB - 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 Li xNi0.8Co0.15Al0.05O2 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. The structural origin of the thermal instability of cathode materials, which is 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. The in-depth understanding of the thermal decomposition behavior of overcharged cathode materials provides valuable guidance for developing new cathode materials with improved safety characteristics.
KW - cathode materials
KW - lithium-ion batteries
KW - safety
KW - transmission electron microscopy (TEM)
KW - X-ray absorption spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=84874101357&partnerID=8YFLogxK
U2 - 10.1002/adfm.201200693
DO - 10.1002/adfm.201200693
M3 - Article
AN - SCOPUS:84874101357
SN - 1616-301X
VL - 23
SP - 1047
EP - 1063
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 8
ER -