Journal Article

FZJ-2022-01172

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Effects of Polymer Coating Mechanics at Solid‐Electrolyte Interphase for Stabilizing Lithium Metal Anodes

Huang, Z. (First author) ; Choudhury, S. ; Paul, N. ; Thienenkamp, J. H.FZJ* ; Lennartz, P.FZJ* ; Gong, H. ; Müller-Buschbaum, P. ; Brunklaus, G.FZJ* ; Gilles, R. (Corresponding author) ; Bao, Z. (Corresponding author)

2022
Wiley-VCH Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/30931  doi:10.1002/aenm.202103187

Abstract: Lithium metal batteries are next-generation energy storage devices that rely on the stable electrodeposition of lithium metal during the charging process. The major challenge associated with this battery chemistry is related to the uneven deposition that leads to dendritic growth and poor coulombic efficiency (CE). A promising strategy for addressing this challenge is utilizing a polymer coating on the anodic surface. While several works in the past have evaluated polymer coatings, the requirements for polymer design are still unclear. In this work, the effect of polymer dynamics on lithium metal deposition is specifically investigated. Electrolyte (solvent) blocking perfluoropolyether polymer networks with evenly spaced H-bonding sites of various strengths are designed, resulting in significant differences in the molecular ordering, as analyzed by X-ray scattering measurements. The differences in the H-bonding strength directly impact the mechanical properties of these materials, thus providing a controlled set of samples with a range of polymer dynamics for electrodeposition studies. Finally, a systematic evaluation of the lithium metal electrodeposition quality with these polymers as anodic coating shows that polymers with flowability or faster polymer dynamics exhibit higher CE. These experimental findings provide rational design principles for soft polymer coatings on lithium metal anodes.

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)
2. 1222 - Components and Cells (POF4-122) (POF4-122)
3. 1223 - Batteries in Application (POF4-122) (POF4-122)

Appears in the scientific report 2022

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 25 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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