Single-Ion Conducting Polymer Electrolyte for Superior Sodium-Metal Batteries.
Angew Chem Int Ed Engl
; 62(43): e202308699, 2023 Oct 23.
Article
em En
| MEDLINE
| ID: mdl-37496056
ABSTRACT
Sodium-metal batteries (SMBs) are considered a potential alternative to high-energy lithium-metal batteries (LMBs). However, the high reactivity of metallic sodium towards common liquid organic electrolytes renders such battery technology particularly challenging. Herein, we propose a multi-block single-ion conducting polymer electrolyte (SIPE) doped with ethylene carbonate as suitable electrolyte system for SMBs. This novel SIPE provides a very high ionic conductivity (2.6â
mS cm-1 ) and an electrochemical stability window of about 4.1â
V at 40 °C, enabling stable sodium stripping and plating and excellent rate capability of Na||Na3 V2 (PO4 )3 cells up to 2â
C. Remarkably, such cells provide a capacity retention of about 85 % after 1,000 cycles at 0.2â
C thanks to the very high Coulombic efficiency (99.9 %), resulting from an excellent interfacial stability towards sodium metal and the Na3 V2 (PO4 )3 cathode.
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MEDLINE
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En
Ano de publicação:
2023
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Article