Publication
Title
Low-temperature and fast-charge sodium metal batteries
Author
Abstract
Low-temperature operation of sodium metal batteries (SMBs) at the high rate faces challenges of unstable solid electrolyte interphase (SEI), Na dendrite growth, and sluggish Na+ transfer kinetics, causing a largely capacity curtailment. Herein, low-temperature and fast-charge SMBs are successfully constructed by synergetic design of the electrolyte and electrode. The optimized weak-solvation dual-salt electrolyte enables high Na plating/stripping reversibility and the formation of NaF-rich SEI layer to stabilize sodium metal. Moreover, an integrated copper sulfide electrode is in situ fabricated by directly chemical sulfuration of copper current collector with micro-sized sulfur particles, which significantly improves the electronic conductivity and Na+ diffusion, knocking down the kinetic barriers. Consequently, this SMB achieves the reversible capacity of 202.8 mAh g-1 at -20 degrees C and 1 C (1 C = 558 mA g-1). Even at -40 degrees C, a high capacity of 230.0 mAh g-1 can still be delivered at 0.2 C. This study is encouraging for further exploration of cryogenic alkali metal batteries, and enriches the electrode material for low-temperature energy storage. A low-temperature and fast-charge sodium metal battery is successfully constructed by simultaneous design of both the electrolyte and electrode. A weakly solvated dual-salt electrolyte enables fast ion desolvation and the formation of NaF-rich solid electrolyte interphase (SEI) layer to stabilize sodium metal, and meanwhile, CuS as the active material is simply prepared by in situ chemical sulfuration of copper current collector, knocking downg the kinitic barrier in electrode. This synergetic strategy could be extended to other cryogenic alkali metal batteries. image
Language
English
Source (journal)
Small. - Weinheim
Publication
Weinheim : Wiley-v c h verlag gmbh , 2024
ISSN
1613-6810
DOI
10.1002/SMLL.202311810
Volume/pages
(2024) , 9 p.
Article Reference
2311810
ISI
001169495500001
Pubmed ID
38385819
Full text (Publisher's DOI)
Full text (open access)
The author-created version that incorporates referee comments and is the accepted for publication version Available from 22.08.2024
Full text (publisher's version - intranet only)
UAntwerpen
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identifier
Creation 29.03.2024
Last edited 16.04.2024
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