Tailoring the Electrode-Electrolyte Interface for Reliable Operation of All-Climate 4.8â
V Li||NCM811 Batteries.
Angew Chem Int Ed Engl
; : e202410893, 2024 Aug 06.
Article
em En
| MEDLINE
| ID: mdl-39105385
ABSTRACT
Combining high-voltage nickel-rich cathodes with lithium metal anodes is among the most promising approaches for achieving high-energy-density lithium batteries. However, most current electrolytes fail to simultaneously satisfy the compatibility requirements for the lithium metal anode and the tolerance for the ultra-high voltage NCM811 cathode. Here, we have designed an ultra-oxidation-resistant electrolyte by meticulously adjusting the composition of fluorinated carbonates. Our study reveals that a solid-electrolyte interphase (SEI) rich in LiF and Li2O is constructed on the lithium anode through the synergistic decomposition of the fluorinated solvents and PF6 - anion, facilitating smooth lithium metal deposition. The superior oxidation resistance of our electrolyte enables the Li||NCM811â
cell to deliver a capacity retention of 80 % after 300â
cycles at an ultrahigh cut-off voltage of 4.8â
V. Additionally, a pioneering 4.8â
V-class lithium metal pouch cell with an energy density of 462.2â
Wh kg-1 stably cycles for 110â
cycles under harsh conditions of high cathode loading (30â
mg cm-2), low N/P ratio (1.18), and lean electrolytes (2.3â
g Ah-1).
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Base de dados:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2024
Tipo de documento:
Article