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Nanoporous Polymer Films with a High Cation Transference Number Stabilize Lithium Metal Anodes in Light-Weight Batteries for Electrified Transportation

Journal Article · · Nano Letters

To suppress dendrite formation in lithium metal batteries, high cation transference number electrolytes that reduce electrode polarization are highly desirable, but rarely available using conventional liquid electrolytes. Here, we show that liquid electrolytes increase their cation transference numbers (e.g., ~0.2 to >0.70) when confined to a structurally rigid polymer host whose pores are on a similar length scale (0.5–2 nm) as the Debye screening length in the electrolyte, which results in a diffuse electrolyte double layer at the polymer–electrolyte interface that retains counterions and reject co-ions from the electrolyte due to their larger size. Lithium anodes coated with ~1 μm thick overlayers of the polymer host exhibit both a low area-specific resistance and clear dendrite-suppressing character, as evident from their performance in Li–Li and Li–Cu cells as well as in post-mortem analysis of the anode’s morphology after cycling. High areal capacity Li–S cells (4.9 mg cm–2; 8.2 mAh cm–2) implementing these high transference number polymer-hosted liquid electrolytes were remarkably stable, considering ~24 μm of lithium was electroreversibly deposited in each cycle at a C-rate of 0.2. In conclusion, we further identified a scalable manufacturing path for these polymer-coated lithium electrodes, which are drop-in components for lithium metal battery manufacturing.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1507408
Alternate ID(s):
OSTI ID: 1634042
Report Number(s):
SAND--2019-3255J; 673712
Journal Information:
Nano Letters, Journal Name: Nano Letters Journal Issue: 2 Vol. 19; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Diversity-Oriented Synthesis of Polymers of Intrinsic Microporosity with Explicit Solid Solvation Cages for Lithium Ions preprint January 2019
Harnessing Structural and Dynamic Heterogeneity to Direct Ion Transport in Plastic Crystal-Polymer Composite Solid-Ion Conductors preprint January 2020
Liquid Polydimethylsiloxane Grafting to Enable Dendrite‐Free Li Plating for Highly Reversible Li‐Metal Batteries journal May 2019
Low‐Cost Self‐Assembled Oxide Separator for Rechargeable Batteries journal June 2019
A Coaxial‐Interweaved Hybrid Lithium Metal Anode for Long‐Lifespan Lithium Metal Batteries journal August 2019

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