Using Mixed Salt Electrolytes to Stabilize Silicon Anodes for Lithium-Ion Batteries via in Situ Formation of Li–M–Si Ternaries (M = Mg, Zn, Al, Ca)
Abstract
Replacing traditional graphite anode by Si anode can significantly improve the energy density of lithium-ion batteries. Yet, the large volume expansion and the formation of highly reactive lithium silicides during charging cause the continuous lithium and electrolyte consumption as well as the fast decay of Si anodes. In this work, by adding 0.1 M M(TFSI)x (M = Mg, Zn, Al and Ca) as a second salt into the electrolyte, we stabilize the anode chemistry through the in situ formation of Li–M–Si ternary phases during the charging process. First, lithium silicides and magnesium lithium silicides were synthesized as model compounds to investigate the influence of metal doping on the reactivity of lithiated Si. Using solid-state nuclear magnetic resonance spectroscopy, we show that Mg doping can dramatically suppress the chemical reactions between the lithium silicide compounds and common electrolyte solvents. New mixed salt electrolytes were prepared containing M(TFSI)x as a second salt to LiPF6 and tested in commercially relevant electrodes, which show higher capacity, superior cyclability, and higher Coulombic efficiencies in both half-cell and full-cell configurations (except for Zn) when compared with standard electrolytes. Post-electrochemistry characterizations demonstrate that adding M salts leads to the co-insertion of M cations along with Li intomore »
- Authors:
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1558122
- Alternate Identifier(s):
- OSTI ID: 1558232
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Published Article
- Journal Name:
- ACS Applied Materials and Interfaces
- Additional Journal Information:
- Journal Name: ACS Applied Materials and Interfaces Journal Volume: 11 Journal Issue: 33; Journal ID: ISSN 1944-8244
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; Si anodes; stability; lithium-ion battery; electrolyte additive; mixed salt electrolyte; prelithiation
Citation Formats
Han, Binghong, Liao, Chen, Dogan, Fulya, Trask, Stephen E., Lapidus, Saul H., Vaughey, John T., and Key, Baris. Using Mixed Salt Electrolytes to Stabilize Silicon Anodes for Lithium-Ion Batteries via in Situ Formation of Li–M–Si Ternaries (M = Mg, Zn, Al, Ca). United States: N. p., 2019.
Web. doi:10.1021/acsami.9b07270.
Han, Binghong, Liao, Chen, Dogan, Fulya, Trask, Stephen E., Lapidus, Saul H., Vaughey, John T., & Key, Baris. Using Mixed Salt Electrolytes to Stabilize Silicon Anodes for Lithium-Ion Batteries via in Situ Formation of Li–M–Si Ternaries (M = Mg, Zn, Al, Ca). United States. https://doi.org/10.1021/acsami.9b07270
Han, Binghong, Liao, Chen, Dogan, Fulya, Trask, Stephen E., Lapidus, Saul H., Vaughey, John T., and Key, Baris. Thu .
"Using Mixed Salt Electrolytes to Stabilize Silicon Anodes for Lithium-Ion Batteries via in Situ Formation of Li–M–Si Ternaries (M = Mg, Zn, Al, Ca)". United States. https://doi.org/10.1021/acsami.9b07270.
@article{osti_1558122,
title = {Using Mixed Salt Electrolytes to Stabilize Silicon Anodes for Lithium-Ion Batteries via in Situ Formation of Li–M–Si Ternaries (M = Mg, Zn, Al, Ca)},
author = {Han, Binghong and Liao, Chen and Dogan, Fulya and Trask, Stephen E. and Lapidus, Saul H. and Vaughey, John T. and Key, Baris},
abstractNote = {Replacing traditional graphite anode by Si anode can significantly improve the energy density of lithium-ion batteries. Yet, the large volume expansion and the formation of highly reactive lithium silicides during charging cause the continuous lithium and electrolyte consumption as well as the fast decay of Si anodes. In this work, by adding 0.1 M M(TFSI)x (M = Mg, Zn, Al and Ca) as a second salt into the electrolyte, we stabilize the anode chemistry through the in situ formation of Li–M–Si ternary phases during the charging process. First, lithium silicides and magnesium lithium silicides were synthesized as model compounds to investigate the influence of metal doping on the reactivity of lithiated Si. Using solid-state nuclear magnetic resonance spectroscopy, we show that Mg doping can dramatically suppress the chemical reactions between the lithium silicide compounds and common electrolyte solvents. New mixed salt electrolytes were prepared containing M(TFSI)x as a second salt to LiPF6 and tested in commercially relevant electrodes, which show higher capacity, superior cyclability, and higher Coulombic efficiencies in both half-cell and full-cell configurations (except for Zn) when compared with standard electrolytes. Post-electrochemistry characterizations demonstrate that adding M salts leads to the co-insertion of M cations along with Li into Si during the lithiation process, stabilizing silicon anions by forming more stable Li–M–Si ternaries, which fundamentally changes the traditional Li–Si binary chemistry while minimally affecting silicon electrochemical profiles and theoretical capacities. This report opens a new and simple way to stabilize silicon anodes to enable widespread application of Si anodes for lithium-ion batteries.},
doi = {10.1021/acsami.9b07270},
journal = {ACS Applied Materials and Interfaces},
number = 33,
volume = 11,
place = {United States},
year = {Thu Jul 18 00:00:00 EDT 2019},
month = {Thu Jul 18 00:00:00 EDT 2019}
}
https://doi.org/10.1021/acsami.9b07270
Web of Science
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