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Title: Electrolyte additive enabled fast charging and stable cycling lithium metal batteries

Abstract

Lithium (Li) metal battery is an attractive energy storage system owing to the ultrahigh specific capacity and the lowest redox potential of Li metal anode. However, safety concern associated with dendrite growth and limited cycle life especially at a high charge current density are two critical challenges hindering the practical applications of rechargeable Li metal batteries. Here, we report for the first time that an optimal amount (0.05 M) of LiPF6 as additive in the LiTFSI-LiBOB dual-salt/carbonate-based electrolyte can significantly enhance the charging capability and the long-term cycle life of Li metal batteries with a moderately high cathode loading of 1.75 mAh cm-2. Unprecedented stable-cycling (97.1% capacity retention after 500 cycles) along with very limited increase in electrode over-potential has been achieved at a high current density of 1.75 mA cm-2. This unparalleled fast charging and stable cycling performance is contributed from both the stabilized Al cathode current collector, and, more importantly, the robust and conductive SEI layer formed on Li metal anode in the presence of the LiPF6 additive.

Authors:
ORCiD logo; ORCiD logo; ; ; ; ORCiD logo;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1346291
Report Number(s):
PNNL-SA-119349
Journal ID: ISSN 2058-7546; 48379; VT1201000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nature Energy; Journal Volume: 2; Journal Issue: 3
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Li metal batteries; LiTFSI-LiBOB dual-salt; charging capability; LiPF6 additive; Environmental Molecular Sciences Laboratory

Citation Formats

Zheng, Jianming, Engelhard, Mark H., Mei, Donghai, Jiao, Shuhong, Polzin, Bryant J., Zhang, Ji-Guang, and Xu, Wu. Electrolyte additive enabled fast charging and stable cycling lithium metal batteries. United States: N. p., 2017. Web. doi:10.1038/nenergy.2017.12.
Zheng, Jianming, Engelhard, Mark H., Mei, Donghai, Jiao, Shuhong, Polzin, Bryant J., Zhang, Ji-Guang, & Xu, Wu. Electrolyte additive enabled fast charging and stable cycling lithium metal batteries. United States. doi:10.1038/nenergy.2017.12.
Zheng, Jianming, Engelhard, Mark H., Mei, Donghai, Jiao, Shuhong, Polzin, Bryant J., Zhang, Ji-Guang, and Xu, Wu. Wed . "Electrolyte additive enabled fast charging and stable cycling lithium metal batteries". United States. doi:10.1038/nenergy.2017.12.
@article{osti_1346291,
title = {Electrolyte additive enabled fast charging and stable cycling lithium metal batteries},
author = {Zheng, Jianming and Engelhard, Mark H. and Mei, Donghai and Jiao, Shuhong and Polzin, Bryant J. and Zhang, Ji-Guang and Xu, Wu},
abstractNote = {Lithium (Li) metal battery is an attractive energy storage system owing to the ultrahigh specific capacity and the lowest redox potential of Li metal anode. However, safety concern associated with dendrite growth and limited cycle life especially at a high charge current density are two critical challenges hindering the practical applications of rechargeable Li metal batteries. Here, we report for the first time that an optimal amount (0.05 M) of LiPF6 as additive in the LiTFSI-LiBOB dual-salt/carbonate-based electrolyte can significantly enhance the charging capability and the long-term cycle life of Li metal batteries with a moderately high cathode loading of 1.75 mAh cm-2. Unprecedented stable-cycling (97.1% capacity retention after 500 cycles) along with very limited increase in electrode over-potential has been achieved at a high current density of 1.75 mA cm-2. This unparalleled fast charging and stable cycling performance is contributed from both the stabilized Al cathode current collector, and, more importantly, the robust and conductive SEI layer formed on Li metal anode in the presence of the LiPF6 additive.},
doi = {10.1038/nenergy.2017.12},
journal = {Nature Energy},
number = 3,
volume = 2,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}