Dual‐Mechanism Anchoring of Iodine Species by Pitch‐Derived Porous Carbon for Enhanced Zinc–Iodine Battery Performance

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 3, 2025

Aqueous Zn-I2 battery is an overwhelming candidate for sustainable energy storage systems due to its high safety, low cost, and environmental friendliness. However, the serious self-discharge shuttle effect initiated by soluble polyiodides significantly hinder further development. Herein, a pitch-derived carbon (PPCMK) with unique micro-/mesopores structure abundant oxygen-containing functional groups prepared, dual-mechanism anchoring of iodine species effectively confine alleviating above problems. The rich micropores PPCMK (0.62 nm) function inhibit formation I3 -, large specific surface area enables I2 uptake 64.51%. Moreover, enhance interaction - strengthen polyiodide confinement. Therefore, batteries exhibit capacity 236.76 mAh g-1 (4 mgiodine cm-2) average Coulombic efficiency 99.73% at 1 C, rate 18.18% loss after one-week resting, superior durability 20 000 cycles C 95.08% retentive capacity. Especially, pouch cell exhibits capacitance 5.51 cm-2 high-loading (30 cm-2). This study provides economically effective solution large-scale production high-performance batteries.

Language: Английский

Customized Design of R‐SO₃H‐Containing Binders for Durable Iodine‐Loading Cathode of Zinc–Iodine Batteries

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

Abstract The challenges of iodine dissolution and polyiodide shuttle behavior severely hinder the development zinc–iodine batteries (ZIBs). Among battery components, binders play a vital role in maintaining mechanical integrity facilitating conversion reaction iodine‐loading cathode ZIBs. Herein, series polyimide‐based polymers rich sulfonic acid group (R‐SO 3 H) are elaborately designed as functional for cathodes. According to spectroscopic characterization theoretical calculation results, PI‐4S binder with R‐SO H, hydroxyl imide groups holds stronger chemisorption capability I 2 /I − species, which effectively helps block active iodine's behavior. As result, corresponding ZIBs deliver reversible capacity 142.7 mAh g −1 over 600 cycles at 0.2 A , high 157.6 500 0.5 50 °C, durable cycling stability 88 15000 4 . This work guides autonomous design multifunctional polymer cathodes facilitates practical application

Language: Английский

Reducing Self-Discharge of Iodide-Based Redox Supercapacitors through Highly Concentrated Salt Solution

Journal of Alloys and Compounds, Journal Year: 2025, Volume and Issue: unknown, P. 180909 - 180909

Published: May 1, 2025

Language: Английский