Insight into the Critical Role of Exchange Current Density on Electrodeposition Behavior of Lithium Metal
Artikel i vetenskaplig tidskrift, 2021

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.

Li metal

exchange current density

phase-field model

electrochemical kinetics

electrodeposition

Författare

Yangyang Liu

Xi'an Jiaotong University

Xieyu Xu

Moscow State University

Matthew Sadd

Chalmers, Fysik, Materialfysik

Olesya O. Kapitanova

Moscow Institute of Physics and Technology

Victor A. Krivchenko

Moscow Institute of Physics and Technology

Jun Ban

Xi'an Jiaotong University

Jialin Wang

Xi'an Jiaotong University

Xingxing Jiao

Xi'an Jiaotong University

Zhongxiao Song

Xi'an Jiaotong University

Jiangxuan Song

Xi'an Jiaotong University

Shizhao Xiong

Chalmers, Fysik, Materialfysik

Aleksandar Matic

Chalmers, Fysik, Materialfysik

Advanced Science

2198-3844 (ISSN)

Vol. In Press

Ämneskategorier

Annan kemiteknik

Annan fysik

Annan kemi

DOI

10.1002/advs.202003301

Mer information

Senast uppdaterat

2021-01-19