TY - JOUR
T1 - Correlation between long range and local structural changes in Ni-rich layered materials during charge and discharge process
AU - Zheng, Shiyao
AU - Hong, Chaoyu
AU - Guan, Xiaoyun
AU - Xiang, Yuxuan
AU - Liu, Xiangsi
AU - Xu, Gui-Liang
AU - Liu, Rui
AU - Zhong, Guiming
AU - Zheng, Feng
AU - Li, Yixiao
AU - Zhang, Xiaoyi
AU - Ren, Yang
AU - Chen, Zonghai
AU - Amine, Khalil
AU - Yang, Yong
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2019/2/1
Y1 - 2019/2/1
N2 - Ni-rich cathode materials can deliver higher energy density with a lower cost compared with other conventional layered oxide materials. However, the cycling performance of Ni-rich materials needs further improvement, and the irreversible phase transformation related to the cell failure is not fully understood yet. Although an H1–H2–H3 structural change process is revealed, a more specific explanation about the difference of these hexagonal phases is needed for deeper comprehension and further targeted modification of Ni-rich materials. In this work, the different phase transformation mechanisms of LiNi0.6Co0.2Mn0.2O2 (NCM622) and LiNi0.8Co0.1Mn0.1O2 (NCM811) are investigated by C X-ray diffraction (XRD) measurement, and the relationship between structural change and capacity degradation is discussed, showing that H3 phase can be harmful for cycling. In addition, 6Li solid state nuclear magnetic resonance (ss-NMR) experiments are carried out for detecting the Li chemical environment at different state of charge, and the data can be associated with structural change obtained from in operando XRD results. From the analysis mentioned above, a new explanation of H1/H2/H3 is given, and a relationship between long range and local structural change has been put forward for the first time.
AB - Ni-rich cathode materials can deliver higher energy density with a lower cost compared with other conventional layered oxide materials. However, the cycling performance of Ni-rich materials needs further improvement, and the irreversible phase transformation related to the cell failure is not fully understood yet. Although an H1–H2–H3 structural change process is revealed, a more specific explanation about the difference of these hexagonal phases is needed for deeper comprehension and further targeted modification of Ni-rich materials. In this work, the different phase transformation mechanisms of LiNi0.6Co0.2Mn0.2O2 (NCM622) and LiNi0.8Co0.1Mn0.1O2 (NCM811) are investigated by C X-ray diffraction (XRD) measurement, and the relationship between structural change and capacity degradation is discussed, showing that H3 phase can be harmful for cycling. In addition, 6Li solid state nuclear magnetic resonance (ss-NMR) experiments are carried out for detecting the Li chemical environment at different state of charge, and the data can be associated with structural change obtained from in operando XRD results. From the analysis mentioned above, a new explanation of H1/H2/H3 is given, and a relationship between long range and local structural change has been put forward for the first time.
KW - In operando XRD
KW - Li local environment
KW - Ni-rich materials
KW - Solid-state NMR
KW - Structural change
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U2 - 10.1016/j.jpowsour.2018.11.053
DO - 10.1016/j.jpowsour.2018.11.053
M3 - RGC 21 - Publication in refereed journal
SN - 0378-7753
VL - 412
SP - 336
EP - 343
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -