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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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A Zinc-Bromine Battery with Deep Eutectic Electrolytes.

Jiyun Heo1, Kyungjae Shin1, Hee-Tak Kim1,2

  • 1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 30, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel deep eutectic solvent (DES) electrolyte for zinc-bromine batteries (ZBBs). This water-free DES enhances battery performance, enabling longer cycle life and flexible designs for wearable electronics.

Keywords:
Zn-Br batteriesanode-less systemdeep eutectic electrolytesflexible pouch cellhalogen chemistry

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Deep eutectic solvents (DES) are emerging electrolytes with tunable properties, low cost, and ease of preparation.
  • Traditional zinc-bromine batteries (ZBBs) face challenges with electrolyte stability and component evaporation.

Purpose of the Study:

  • To develop and evaluate a novel zinc-halide-based DES electrolyte for enhanced ZBB performance.
  • To investigate the role of chloride anions in modifying electrolyte structure and improving electrochemical kinetics.
  • To demonstrate the feasibility of a flexible, closed-cell ZBB using the developed DES.

Main Methods:

  • Preparation of a water-free DES electrolyte by mixing ZnBr2, ZnCl2, and a bromine-capturing agent.
  • Fabrication and electrochemical testing of ZBBs utilizing the DES electrolyte.
  • Performance evaluation including rate capability, cycle life, and stability under mechanical stress (folding test).

Main Results:

  • The water-free DES electrolyte enabled a closed-cell configuration by preventing Br2 evaporation and H2 evolution.
  • Chloride anions altered zinc-halide complex anion structures, enhancing ion mobility and electrode kinetics.
  • The optimized DES electrolyte demonstrated a 90-fold increase in cycle life compared to a DES without ZnCl2.
  • A flexible pouch-type ZBB operated stably for over 120 cycles without swelling and passed folding tests.

Conclusions:

  • The developed DES electrolyte significantly improves ZBB performance, offering higher rate capability and extended cycle life.
  • The chloride anion plays a crucial role in optimizing the DES electrolyte's electrochemical properties.
  • The flexible, swelling-free ZBB demonstrates potential for consumer applications, particularly in wearable electronics.