TY - JOUR
T1 - Research on EIS characterization and internal morphological changes of LIBs during degradation process
AU - Shu, Xiong
AU - Yang, Wenxian
AU - Yang, Bowen
AU - Wei, Kexiang
AU - Punyawudho, Konlayutt
AU - Liu, Chen
N1 - Funding Information:
The authors gratefully acknowledge the National Natural Science Foundation of China (Grant No. 52205149), the Science and Technology Foundation of Hunan Province (Grant No. 2022JJ50119, and 2023GK2038).
Publisher Copyright:
© 2023
PY - 2024/1/1
Y1 - 2024/1/1
N2 - Electric vehicles (EVs) are increasingly being used today, but the safety of their battery system remains an issue. Therefore, a clear understanding of the degradation mechanism of EV batteries has become a pressing issue. In this study, the EIS characterization and internal morphological changes are investigated during degradation process of 18,650 LIBs. The research results show that the EIS value of LIBs changes to varying degrees with battery degradation, but this change is not only due to the ageing of LIB materials, but also related to the LIB's state of charge. In lithium-ion battery EIS, the ohmic impedance is mainly influenced by the SOH, while the transfer impedance and extended impedance are influenced by the SOC of the battery. In addition, as the aging process progresses, the particles of the anode and cathode materials of the LIB gradually become smaller and more fragmented, the decomposition on the surface of the negative electrode becomes more significant, which is mainly due to the fact that the decomposition of the graphite negative electrode is more pronounced, which evidenced by scanning electron microscopy (SEM) images. These new finds will help further improve the design and management of LIBs.
AB - Electric vehicles (EVs) are increasingly being used today, but the safety of their battery system remains an issue. Therefore, a clear understanding of the degradation mechanism of EV batteries has become a pressing issue. In this study, the EIS characterization and internal morphological changes are investigated during degradation process of 18,650 LIBs. The research results show that the EIS value of LIBs changes to varying degrees with battery degradation, but this change is not only due to the ageing of LIB materials, but also related to the LIB's state of charge. In lithium-ion battery EIS, the ohmic impedance is mainly influenced by the SOH, while the transfer impedance and extended impedance are influenced by the SOC of the battery. In addition, as the aging process progresses, the particles of the anode and cathode materials of the LIB gradually become smaller and more fragmented, the decomposition on the surface of the negative electrode becomes more significant, which is mainly due to the fact that the decomposition of the graphite negative electrode is more pronounced, which evidenced by scanning electron microscopy (SEM) images. These new finds will help further improve the design and management of LIBs.
KW - Degradation mechanism
KW - EIS
KW - Electric vehicle
KW - Lithium-ion battery
KW - SEM
UR - http://www.scopus.com/inward/record.url?scp=85175648889&partnerID=8YFLogxK
U2 - 10.1016/j.engfailanal.2023.107764
DO - 10.1016/j.engfailanal.2023.107764
M3 - Article
AN - SCOPUS:85175648889
VL - 155
JO - Engineering Failure Analysis
JF - Engineering Failure Analysis
SN - 1350-6307
M1 - 107764
ER -
