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Title: Guided Lithium Metal Deposition and Improved Lithium Coulombic Efficiency through Synergistic Effects of LiAsF 6 and Cyclic Carbonate Additives

Abstract

Spatial and morphology control over lithium (Li) metal nucleation/growth, as well as improving Li Coulombic efficiency (CE) are of the most challenging issues for rechargeable Li metal batteries. Here, we report that LiAsF6 and vinylene carbonate (VC) can work synergistically to address these challenges. It is revealed that AsF6- can be reduced to Li3As and LiF, which can act as seeds for Li growth and form a robust solid electrolyte interphase (SEI) layer, respectively. The addition of VC is critical because it not only enables uniform AsF6- reduction by passivating the defect sites on Cu substrate, but also improves the SEI layer flexibility during the reductive polymerization process. As a result, highly compact, uniform and dendrite-free Li film with vertically aligned columns structure can be obtained with greatly increased Li CE, and the Li metal batteries using the electrolyte with both LiAsF6 and VC additives can have much improved cycle life.

Authors:
 [1];  [1];  [2];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
  2. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Washington 99354, United States
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1422290
Report Number(s):
PNNL-SA-128909
Journal ID: ISSN 2380-8195; 49321; VT1201000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: ACS Energy Letters; Journal Volume: 3; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
Lithium metal deposition; Coulombic efficiency; LiAsF6; Vinylene carbonate; Lithium metal anode; Environmental Molecular Sciences Laboratory

Citation Formats

Ren, Xiaodi, Zhang, Yaohui, Engelhard, Mark H., Li, Qiuyan, Zhang, Ji-Guang, and Xu, Wu. Guided Lithium Metal Deposition and Improved Lithium Coulombic Efficiency through Synergistic Effects of LiAsF 6 and Cyclic Carbonate Additives. United States: N. p., 2017. Web. doi:10.1021/acsenergylett.7b00982.
Ren, Xiaodi, Zhang, Yaohui, Engelhard, Mark H., Li, Qiuyan, Zhang, Ji-Guang, & Xu, Wu. Guided Lithium Metal Deposition and Improved Lithium Coulombic Efficiency through Synergistic Effects of LiAsF 6 and Cyclic Carbonate Additives. United States. doi:10.1021/acsenergylett.7b00982.
Ren, Xiaodi, Zhang, Yaohui, Engelhard, Mark H., Li, Qiuyan, Zhang, Ji-Guang, and Xu, Wu. Mon . "Guided Lithium Metal Deposition and Improved Lithium Coulombic Efficiency through Synergistic Effects of LiAsF 6 and Cyclic Carbonate Additives". United States. doi:10.1021/acsenergylett.7b00982.
@article{osti_1422290,
title = {Guided Lithium Metal Deposition and Improved Lithium Coulombic Efficiency through Synergistic Effects of LiAsF 6 and Cyclic Carbonate Additives},
author = {Ren, Xiaodi and Zhang, Yaohui and Engelhard, Mark H. and Li, Qiuyan and Zhang, Ji-Guang and Xu, Wu},
abstractNote = {Spatial and morphology control over lithium (Li) metal nucleation/growth, as well as improving Li Coulombic efficiency (CE) are of the most challenging issues for rechargeable Li metal batteries. Here, we report that LiAsF6 and vinylene carbonate (VC) can work synergistically to address these challenges. It is revealed that AsF6- can be reduced to Li3As and LiF, which can act as seeds for Li growth and form a robust solid electrolyte interphase (SEI) layer, respectively. The addition of VC is critical because it not only enables uniform AsF6- reduction by passivating the defect sites on Cu substrate, but also improves the SEI layer flexibility during the reductive polymerization process. As a result, highly compact, uniform and dendrite-free Li film with vertically aligned columns structure can be obtained with greatly increased Li CE, and the Li metal batteries using the electrolyte with both LiAsF6 and VC additives can have much improved cycle life.},
doi = {10.1021/acsenergylett.7b00982},
journal = {ACS Energy Letters},
number = 1,
volume = 3,
place = {United States},
year = {Mon Nov 20 00:00:00 EST 2017},
month = {Mon Nov 20 00:00:00 EST 2017}
}