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Polymer‐in‐“Quasi‐Ionic Liquid” Electrolytes for High‐Voltage Lithium Metal Batteries

Journal Article · · Advanced Energy Materials
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  1. Energy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
  2. Environmental Molecular Sciences Laboratory Pacific Northwest National Laboratory Richland WA 99354 USA
  3. Electrochemistry Branch U.S. Army Research Laboratory Adelphi MD 20783 USA
  4. Energy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99354 USA, Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei Anhui 230026 China
Abstract

Due to the limited oxidation stability (<4 V) of ether oxygen in its polymer structure, polyethylene oxide (PEO)‐based polymer electrolytes are not compatible with high‐voltage (>4 V) cathodes, thus hinder further increases in the energy density of lithium (Li) metal batteries (LMBs). Here, a new type of polymer‐in‐“quasi‐ionic liquid” electrolyte is designed, which reduces the electron density on ethereal oxygens in PEO and ether solvent molecules, induces the formation of stable interfacial layers on both surfaces of the LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NMC) cathode and the Li metal anode in Li||NMC batteries, and results in a capacity retention of 88.4%, 86.7%, and 79.2% after 300 cycles with a charge cutoff voltage of 4.2, 4.3, and 4.4 V for the LMBs, respectively. Therefore, the use of “quasi‐ionic liquids” is a promising approach to design new polymer electrolytes for high‐voltage and high‐specific‐energy LMBs.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1562552
Alternate ID(s):
OSTI ID: 1576774
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 41 Vol. 9; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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