.png){kind=icon}
.png){kind=icon}
Return
A Dilute Electrolyte Additive Enables Synergistic Thermodynamic and Kinetic Modulation for Durable Four-Electron Zn-I2 Batteries
.png){kind=icon}
PRE
AI
S
T
S
L
P
L
L
DOI：10.1039/D6GC02752K.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Aqueous zinc-iodine batteries (ZIBs) based on four-electron I -/I 0 /I + redox chemistry hold great promise for high-energy-density energy storage. However; their practical deployment faces critical challenges; mainly including the polyiodide shuttle effect; hydrolysis of I⁺; sluggish iodine conversion kinetics and poor reversibility of Zn anodes. Herein; we propose a low-concentration electrolyte strategy by employing choline chloride (ChCl) as a dual-functional additive to achieve highly efficient four-electron ZIBs. It has been demonstrated that Ch + not only suppresses the polyiodide shuttle by forming strong complexation but also stabilizes the ICl intermediate and regulates the I-Cl bonding strength to facilitate the subsequent conversion to I 2 for the iodine cathode; thereby overcoming the key kinetic bottleneck of the I 0 /I⁺ redox process. Simultaneously; Ch⁺ facilitates the Zn 2+ transfer kinetics and inhibits the water activity; effectively promoting the uniform Zn plating with suppressed side reactions. Benefitting from these advantages; the ZIBs assembled with dilute ChCl deliver a high specific capacity of 445 mAh g -1 at 1 A g -1 and achieve a 75% capacity retention after 50; 000 cycles at a high current density of 10 A g -1 . This work provides a facile strategy to simultaneously address the thermodynamic and kinetic issues to enable highperformance four-electron ZIBs.
Journal
G
IF:
0
Papers:
592
Citations:
0
Organization
No organization information available
Cited Papers