Breaking Mass Transport Limitations by Iodized Polyacrylonitrile Anodes for Extremely Fast-Charging Lithium-Ion Batteries.
Angew Chem Int Ed Engl
; 62(52): e202315564, 2023 Dec 21.
Article
en En
| MEDLINE
| ID: mdl-37949835
ABSTRACT
The fast-charging capability of rechargeable batteries is greatly limited by the sluggish ion transport kinetics in anode materials. Here we develop an iodized polyacrylonitrile (I-PAN) anode that can boost the bulk/interphase lithium (Li)-ion diffusion kinetics and accelerate Li-ion desolvation process to realize high-performance fast-charging Li-ion batteries. The iodine immobilized in I-PAN framework expands ion transport channels, compresses the electric double layer, and changes the inner Helmholtz plane to form LiF/LiI-rich solid electrolyte interphase layer. The dissolved iodine ions in the electrolyte self-induced by the interfacial nucleophilic substitution of PF6 - not only promote the Li-ion desolvation process, but also reuse the plated/dead Li formed on the anode under fast-charging conditions. Consequently, the I-PAN anode exhibits a high capacity of 228.5â
mAh g-1 (39 % of capacity at 0.5â
A g-1 delivered in 18 seconds) and negligible capacity decay for 10000â
cycles at 20â
A g-1 . The I-PAN||LiNi0.8 Co0.1 Mn0.1 O2 full cell shows excellent fast-charging performance with attractive capacities and negligible capacity decay for 1000â
cycles at extremely high rates of 5â
C and 10â
C (1â
C=180â
mA g-1 ). We also demonstrate high-performance fast-charging sodium-ion batteries using I-PAN anodes.
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MEDLINE
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En
Revista:
Angew Chem Int Ed Engl
Año:
2023
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Article