Open AccessInsight into the Critical Role of Exchange Current Density on Electrodeposition Behavior of Lithium Metal
Author(s) -
Liu Yangyang,
Xu Xieyu,
Sadd Matthew,
Kapitanova Olesya O.,
Krivchenko Victor A.,
Ban Jun,
Wang Jialin,
Jiao Xingxing,
Song Zhongxiao,
Song Jiangxuan,
Xiong Shizhao,
Matic Aleksandar
Publication year - 2021
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202003301
Subject(s) - anode , faraday efficiency , exchange current density , nucleation , current density , materials science , cathode , lithium (medication) , dendrite (mathematics) , metal , electrode , chemical engineering , plating (geology) , electrochemistry , metallurgy , chemistry , medicine , physics , geometry , mathematics , organic chemistry , quantum mechanics , engineering , endocrinology , geophysics , geology , tafel equation
Due to an ultrahigh theoretical specific capacity of 3860 mAh g −1 , lithium (Li) is regarded as the ultimate anode for high‐energy‐density batteries. However, the practical application of Li metal anode is hindered by safety concerns and low Coulombic efficiency both of which are resulted fromunavoidable dendrite growth during electrodeposition. This study focuses on a critical parameter for electrodeposition, the exchange current density, which has attracted only little attention in research on Li metal batteries. A phase‐field model is presented to show the effect of exchange current density on electrodeposition behavior of Li. The results show that a uniform distribution of cathodic current density, hence uniform electrodeposition, on electrode is obtained with lower exchange current density. Furthermore, it is demonstrated that lower exchange current density contributes to form a larger critical radius of nucleation in the initial electrocrystallization that results in a dense deposition of Li, which is a foundation for improved Coulombic efficiency and dendrite‐free morphology. The findings not only pave the way to practical rechargeable Li metal batteries but can also be translated to the design of stable metal anodes, e.g., for sodium (Na), magnesium (Mg), and zinc (Zn) batteries.