期刊
ADVANCED SCIENCE
卷 8, 期 5, 页码 -出版社
WILEY
DOI: 10.1002/advs.202003301
关键词
electrochemical kinetics; electrodeposition; exchange current density; Li metal; phase‐ field model
资金
- Chalmers Areas of Advance Materials Science and Energy
- National Natural Science Foundation of China [51802256, 21875181]
- Russian Foundation for Basic Research (RFBR) [18-29-06036mk]
- China Scholarship Council [201908090043]
- Natural Science Basic Research Program of Shaanxi [2019JLP-13]
- 111 Project 2.0 [BP2018008]
This study reveals the significant impact of exchange current density on the electrodeposition behavior of Li metal batteries. Lower exchange current density leads to uniform electrodeposition, improved Coulombic efficiency, and prevention of dendrite growth.
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.
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