Stable anode-free zinc-ion batteries enabled by alloy network-modulated zinc deposition interface

Journal of Energy Chemistry, Journal Year: 2022, Volume and Issue: 76, P. 32 - 40

Published: Sept. 19, 2022

Language: Английский

---

Zincophobic Electrolyte Achieves Highly Reversible Zinc‐Ion Batteries

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(27)

Published: March 28, 2023

Abstract Zinc metal batteries show tremendous applications in wide‐scale storages still impeded by aqueous electrolytes corrosion and interfacial water splitting reaction. Herein, a zincophobic electrolyte containing succinonitrile (SN) additive is proposed, the SN shows lower affinity for zinc but stronger solid‐state interphase (SEI). In electrolyte, hydroxide sulfate (ZHS) more inclined to accumulate horizontally, forming dense SEI protective layer on surface of Zn anode, effectively slowing down dendrite growth. The enables excellent performance: plating/stripping Coulombic efficiency 99.71% an average 400 cycles; stable cycles symmetric cell 4000 h (0.9% utilization) 325 (86.1% utilization). soft pack battery using limited delivers maximum energy density 57.0 Wh kg −1 (based mass loading cathode materials anode materials). Such simple strategy provides theoretical reference chemistry mild environment practical applications.

Language: Английский

---

Trace amounts of fluorinated surfactant additives enable high performance zinc-ion batteries

Energy storage materials, Journal Year: 2022, Volume and Issue: 53, P. 638 - 645

Published: Oct. 2, 2022

Aqueous zinc-ion batteries are promising alternatives to lithium-ion for grid-scale energy storage. However, the practical application of AZIBs is challenged by side reactions and unsatisfactory performance. Electrolyte additives reported that can inhibit on Zn anode enlarge working potential window aqueous electrolytes. Here we propose trace amounts perfluorooctanoic acid (PFOA) facilitate long-term reversible deposition in due perfluorinated n-octyl chains ordered orientation adsorbing electrode surface. Benefitting from its intrinsic surfactant properties, PFOA reduce surface tension electrolytes improve wettability electrode. Symmetric cells survived up 2200 hours owing self-adjusting absorption layer. The molecular dynamics results show as-formed electronegative adsorption layer acts as a zincophilic regulate ions electrolyte. With adding PFOA, electrochemical stability electrolyte enlarged 2.1 V. Owing ultra-low additive usage amount, this strategy provides facile low-cost method tackle common issues AZIBs.

Language: Английский

---

Self‐Adapting and Self‐Healing Hydrogel Interface with Fast Zn²⁺ Transport Kinetics for Highly Reversible Zn Anodes

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(29)

Published: April 22, 2023

Abstract Construction of polymer‐based artificial solid‐electrolyte interphase films on Zn metal anode holds great potential in the suppression both dendrite growth and side reaction rechargeable aqueous Zn‐ion batteries. However, traditional polymer suffer from critical issues sluggish 2+ transport kinetics rigid interface. Herein, zinc alginate (ZA) hydrogel is designed prepared as a dynamic interface redistributor via situ cross‐linking reaction. The zincophilic negatively charged carboxyl groups ZA promote ions along “Z‐type” pathway, repulsion free SO 4 2‐ anions, desolvation ions, consequently leading to homogeneous deposition effective Additionally, flexibility endows with self‐adapting accommodate volume variation repair possible ruptures, thereby guaranteeing long‐term cycling stability. Assisted by layer, achieves prolonged lifespan over 2200 h without formation dendrites by‐products. Outstanding stability also demonstrated for when coupled MnO 2 cathode, further demonstrating its prospects practical application.

Language: Английский

---

Single‐Ion‐Conducting Hydrogel Electrolytes Based on Slide‐Ring Pseudo‐Polyrotaxane for Ultralong‐Cycling Flexible Zinc‐Ion Batteries

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(36)

Published: June 20, 2023

Flexible zinc-ion batteries (ZIBs) with high capacity and long cycle stability are essential for wearable electronic devices. Hydrogel electrolytes have been developed to provide ion-transfer channels while maintaining the integrity of ZIBs under mechanical strain. However, hydrogel matrices typically swollen aqueous salt solutions increase ionic conductivity, which can hinder intimate contact electrodes reduce properties. To address this, a single-Zn-ion-conducting electrolyte (SIHE) is by integrating polyacrylamide network pseudo-polyrotaxane structure. The SIHE exhibits Zn2+ transference number 0.923 conductivity 22.4 mS cm-1 at room temperature. Symmetric demonstrate stable Zn plating/stripping performance over 160 h, homogenous smooth deposition layer. Full cells La-V2 O5 cathodes exhibit 439 mA h g-1 0.1 A excellent retention 90.2% after 3500 cycles 5 . Moreover, flexible display electrochemical harsh conditions, such as bending, cutting, puncturing, soaking. This work provides simple design strategy single-ion-conducting electrolytes, could pave way long-life batteries.

Language: Английский

---