Role of Li-Ion Depletion on Electrode Surface: Underlying Mechanism for Electrodeposition Behavior of Lithium Metal Anode
Artikel i vetenskaplig tidskrift, 2020

The application of lithium metal as an anode material for next generation high energy-density batteries has to overcome the major bottleneck that is the seemingly unavoidable growth of Li dendrites caused by non-uniform electrodeposition on the electrode surface. This problem must be addressed by clarifying the detailed mechanism. In this work the mass-transfer of Li-ions is investigated, a key process controlling the electrochemical reaction. By a phase field modeling approach, the Li-ion concentration and the electric fields are visualized to reveal the role of three key experimental parameters, operating temperature, Li-salt concentration in electrolyte, and applied current density, on the microstructure of deposited Li. It is shown that a rapid depletion of Li-ions on electrode surface, induced by, e.g., low operating temperature, diluted electrolyte and a high applied current density, is the underlying driving force for non-uniform electrodeposition of Li. Thus, a viable route to realize a dendrite-free Li plating process would be to mitigate the depletion of Li-ions on the electrode surface. The methodology and results in this work may boost the practical applicability of Li anodes in Li metal batteries and other battery systems using metal anodes.

electrodeposition

depletion of Li-ions

mass-transfer

lithium metal anodes

surface concentration

Författare

Xieyu Xu

Moscow State University

Yangyang Liu

Xi'an Jiaotong University

Jang-Yeon Hwang

Chonnam National University

Olesya O. Kapitanova

Moscow State University

Moscow Institute of Physics and Technology

Zhongxiao Song

Xi'an Jiaotong University

Yang-Kook Sun

Hanyang University

Aleksandar Matic

Chalmers, Fysik, Materialfysik

Shizhao Xiong

Chalmers, Fysik, Materialfysik

Advanced Energy Materials

1614-6832 (ISSN) 1614-6840 (eISSN)

Vol. 10 44 2002390

Styrkeområden

Energi

Materialvetenskap

Ämneskategorier

Materialkemi

Annan kemiteknik

Annan kemi

DOI

10.1002/aenm.202002390

Mer information

Senast uppdaterat

2021-01-04