Manipulating Electric Double Layer Adsorption for Stable Solid-Electrolyte Interphase in 2.3â
Ah Zn-Pouch Cells.
Angew Chem Int Ed Engl
; 62(23): e202302583, 2023 Jun 05.
Article
em En
| MEDLINE
| ID: mdl-37000437
Constructing a reliable solid-electrolyte interphase (SEI) is imperative for enabling highly reversible zinc metal (Zn0 ) electrodes. Contrary to conventional "bulk solvation" mechanism, we found the SEI structure is dominated by electric double layer (EDL) adsorption. We manipulate the EDL adsorption and Zn2+ solvation with ether additives (i.e. 15-crown-5, 12-crown-4, and triglyme). The 12-crown-4 with medium adsorption on EDL leads to a layer-structured SEI with inner inorganic ZnFx /ZnSx and outer organic C-O-C components. This structure endows SEI with high rigidness and strong toughness enabling the 100â
cm2 Zn||Zn pouch cell to exhibit a cumulative capacity of 4250â
mAh cm-2 at areal-capacity of 10â
mAh cm-2 . More importantly, a 2.3â
Ah Zn||Zn0.25 V2 O5 â
n H2 O pouch cell delivers a recorded energy density of 104â
Wh Lcell -1 and runs for >70â
days under the harsh conditions of low negative/positive electrode ratio (2.2 : 1), lean electrolyte (8â
g Ah-1 ), and high-areal-capacity (≈13â
mAh cm-2 ).
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MEDLINE
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En
Ano de publicação:
2023
Tipo de documento:
Article