Single-phase local-high-concentration solid polymer electrolytes for lithium-metal batteries
Solid polymers are promising electrolytes for Li-metal batteries, but they have limitations: they cannot simultaneously achieve high ionic conductivity, good mechanical strength and compatibility with high-voltage cathodes while suppressing Li dendrites. Here, we design a class of locally high-conce...
Gespeichert in:
Veröffentlicht in: | Nature energy 2024-04, Vol.9 (4), p.386-400 |
---|---|
Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | Solid polymers are promising electrolytes for Li-metal batteries, but they have limitations: they cannot simultaneously achieve high ionic conductivity, good mechanical strength and compatibility with high-voltage cathodes while suppressing Li dendrites. Here, we design a class of locally high-concentration solid polymer electrolytes based on polymer blends, which are termed Li-polymer in F diluter (LPIFD). The Li-polymer (polymer-in-salt) ensures continuous Li-ion conduction channels and contributes to the solid electrolyte interphase (SEI), and the F diluter (inert fluorinated polymer) adds mechanical strength. Studies reveal that a single-phase LPIFD, which is based on a miscible polymer blend, lacks phase boundaries and forms an organic-less and LiF-rich SEI, effectively suppressing lithium dendrites. The single-phase LPIFD delivers ionic conductivity of 3.0 × 10
−4
S cm
−1
, and enables the Li anode to reach a high coulombic efficiency of 99.1% and a critical current density of 3.7 mA cm
−2
. Furthermore, the ability to form an F-rich cathode electrolyte interphase allows LiNi
0.8
Co
0.1
Mn
0.1
O
2
||Li cells to achieve a cycle life of 450 cycles at a high operating voltage of 4.5 V. This design will inspire efforts to commercialize polymer electrolytes for high-energy Li-metal batteries.
Batteries with solid polymer electrolytes face challenges in electrochemical stability and compatibility with high-voltage cathodes. Chunsheng Wang and colleagues have developed a polymer blend with a high Li salt concentration that enhances the stability of solid polymer electrolytes and achieves promising electrochemical performance in full-cell applications. |
---|---|
ISSN: | 2058-7546 2058-7546 |
DOI: | 10.1038/s41560-023-01443-0 |