Dual-Solvent Li-Ion Solvation Enables High-Performance Li-Metal Batteries
Abstract
Abstract Novel electrolyte designs to further enhance the lithium (Li) metal battery cyclability are highly desirable. Here, fluorinated 1,6‐dimethoxyhexane (FDMH) is designed and synthesized as the solvent molecule to promote electrolyte stability with its prolonged –CF 2 – backbone. Meanwhile, 1,2‐dimethoxyethane is used as a co‐solvent to enable higher ionic conductivity and much reduced interfacial resistance. Combining the dual‐solvent system with 1 m lithium bis(fluorosulfonyl)imide (LiFSI), high Li‐metal Coulombic efficiency (99.5%) and oxidative stability (6 V) are achieved. Using this electrolyte, 20 µ m Li||NMC batteries are able to retain ≈ 80% capacity after 250 cycles and Cu||NMC anode‐free pouch cells last 120 cycles with 75% capacity retention under ≈ 2.1 µ L mAh −1 lean electrolyte conditions. Such high performances are attributed to the anion‐derived solid‐electrolyte interphase, originating from the coordination of Li‐ions to the highly stable FDMH and multiple anions in their solvation environments. This work demonstrates a new electrolyte design strategy that enables high‐performance Li‐metal batteries with multisolvent Li‐ion solvation with rationally optimized molecular structure and ratio.
- Authors:
-
[1];
- Stanford Univ., CA (United States)
- Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; National Science Foundation (NSF)
- OSTI Identifier:
- 1787601
- Alternate Identifier(s):
- OSTI ID: 1782365
- Grant/Contract Number:
- AC02-76SF00515; ECCS‐1542152
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Advanced Materials
- Additional Journal Information:
- Journal Volume: 33; Journal Issue: 25; Journal ID: ISSN 0935-9648
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; anode-free batteries; Coulombic efficiency; electrolytes; fluorinated solvents; Li-metal batteries
Citation Formats
Wang, Hansen, Yu, Zhiao, Kong, Xian, Huang, William, Zhang, Zewen, Mackanic, David G., Huang, Xinyi, Qin, Jian, Bao, Zhenan, and Cui, Yi. Dual-Solvent Li-Ion Solvation Enables High-Performance Li-Metal Batteries. United States: N. p., 2021.
Web. doi:10.1002/adma.202008619.
Wang, Hansen, Yu, Zhiao, Kong, Xian, Huang, William, Zhang, Zewen, Mackanic, David G., Huang, Xinyi, Qin, Jian, Bao, Zhenan, & Cui, Yi. Dual-Solvent Li-Ion Solvation Enables High-Performance Li-Metal Batteries. United States. https://doi.org/10.1002/adma.202008619
Wang, Hansen, Yu, Zhiao, Kong, Xian, Huang, William, Zhang, Zewen, Mackanic, David G., Huang, Xinyi, Qin, Jian, Bao, Zhenan, and Cui, Yi. Sun .
"Dual-Solvent Li-Ion Solvation Enables High-Performance Li-Metal Batteries". United States. https://doi.org/10.1002/adma.202008619. https://www.osti.gov/servlets/purl/1787601.
@article{osti_1787601,
title = {Dual-Solvent Li-Ion Solvation Enables High-Performance Li-Metal Batteries},
author = {Wang, Hansen and Yu, Zhiao and Kong, Xian and Huang, William and Zhang, Zewen and Mackanic, David G. and Huang, Xinyi and Qin, Jian and Bao, Zhenan and Cui, Yi},
abstractNote = {Abstract Novel electrolyte designs to further enhance the lithium (Li) metal battery cyclability are highly desirable. Here, fluorinated 1,6‐dimethoxyhexane (FDMH) is designed and synthesized as the solvent molecule to promote electrolyte stability with its prolonged –CF 2 – backbone. Meanwhile, 1,2‐dimethoxyethane is used as a co‐solvent to enable higher ionic conductivity and much reduced interfacial resistance. Combining the dual‐solvent system with 1 m lithium bis(fluorosulfonyl)imide (LiFSI), high Li‐metal Coulombic efficiency (99.5%) and oxidative stability (6 V) are achieved. Using this electrolyte, 20 µ m Li||NMC batteries are able to retain ≈ 80% capacity after 250 cycles and Cu||NMC anode‐free pouch cells last 120 cycles with 75% capacity retention under ≈ 2.1 µ L mAh −1 lean electrolyte conditions. Such high performances are attributed to the anion‐derived solid‐electrolyte interphase, originating from the coordination of Li‐ions to the highly stable FDMH and multiple anions in their solvation environments. This work demonstrates a new electrolyte design strategy that enables high‐performance Li‐metal batteries with multisolvent Li‐ion solvation with rationally optimized molecular structure and ratio.},
doi = {10.1002/adma.202008619},
journal = {Advanced Materials},
number = 25,
volume = 33,
place = {United States},
year = {Sun May 09 00:00:00 EDT 2021},
month = {Sun May 09 00:00:00 EDT 2021}
}
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