TY - JOUR
T1 - Electrochemical behavior and morphological evolution of Li metal anode under high cycling capacity
AU - Hyun, Jae Hwan
AU - Yi, Min Jeong
AU - Jung, Hyejin
AU - Lee, Si Hwan
AU - Um, Ji Hyun
AU - Yu, Seung Ho
N1 - Funding Information:
S.-H. Y. acknowledges the support by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) ( NRF-2020R1C1C1012308 ) and by Technology Development Program to Solve Climate Changes through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT ( NRF-2021M1A2A2038137 ). J. H. U. acknowledges the support provided by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( NRF-2021R1I1A1A01044891 ).
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/1
Y1 - 2023/1
N2 - Despite the high theoretical capacity and low reduction potential of Li metal, low Coulombic efficiency and safety issues of Li metal batteries have hindered their commercialization. In this work, we explore the processes significantly impacting on Coulombic efficiency and overpotential in Li||Cu asymmetric cells depending on “cycling capacity”. To understand this behavior, we focused on three overshooting peaks in voltage profiles, and as each peak involves both Li plating and stripping at two electrodes, we could extract the six individual processes. Among them, the decreasing values of overpotential with increasing cycling capacity (or equivalently, “cycling time” at a fixed current density) are clearly observed, confirming their influence on cell performance. This comprehensive understanding of Coulombic efficiency, overpotential and morphological evolutions from the perspective of time provides new insight to the performance of Li metal batteries.
AB - Despite the high theoretical capacity and low reduction potential of Li metal, low Coulombic efficiency and safety issues of Li metal batteries have hindered their commercialization. In this work, we explore the processes significantly impacting on Coulombic efficiency and overpotential in Li||Cu asymmetric cells depending on “cycling capacity”. To understand this behavior, we focused on three overshooting peaks in voltage profiles, and as each peak involves both Li plating and stripping at two electrodes, we could extract the six individual processes. Among them, the decreasing values of overpotential with increasing cycling capacity (or equivalently, “cycling time” at a fixed current density) are clearly observed, confirming their influence on cell performance. This comprehensive understanding of Coulombic efficiency, overpotential and morphological evolutions from the perspective of time provides new insight to the performance of Li metal batteries.
KW - Coulombic efficiency
KW - Lithium metal batteries
KW - Operando optical microscopy
KW - Overpotential
UR - http://www.scopus.com/inward/record.url?scp=85140329597&partnerID=8YFLogxK
U2 - 10.1016/j.ensm.2022.10.028
DO - 10.1016/j.ensm.2022.10.028
M3 - Article
AN - SCOPUS:85140329597
SN - 2405-8297
VL - 54
SP - 146
EP - 155
JO - Energy Storage Materials
JF - Energy Storage Materials
ER -