Related Experiment Video
Updated: Jun 6, 2025
06:58
Zinc-Sponge Battery Electrodes that Suppress Dendrites
Published on: September 29, 2020
4.3K
A carrageenan-induced highly stable Zn anode by regulating interface chemistry
Yan Xu1, Zhaohe Guo1, Xuena Xu2
1School of Materials and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, China. xuyan8787@163.com.
Dalton Transactions (Cambridge, England : 2003)
|November 22, 2024
Summary
Carrageenan (Carr) as a green electrolyte additive enhances zinc-ion battery safety by preventing zinc dendrites. This biological additive improves Zn anode stability and battery performance for practical applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Zinc-ion batteries (ZIBs) offer safety, low toxicity, and cost-effectiveness but face challenges with Zn dendrites and side reactions.
- These issues hinder the commercial viability of ZIBs, necessitating advanced electrolyte solutions.
Purpose of the Study:
- To investigate carrageenan (Carr), a biological additive, as a solution to improve ZIB performance.
- To address Zn dendrite formation and side reactions in ZIBs using Carr.
Main Methods:
- Carrageenan was employed as an electrolyte additive in ZIBs.
- The interaction of Carr with Zn2+ ions and its effect on the electrode-electrolyte interface were analyzed.
- The composition of the solid electrolyte interphase (SEI) formed on the Zn anode was characterized.
Main Results:
- Carr modulates Zn2+ solvation and ion distribution, promoting uniform Zn deposition.
- A stable SEI layer composed of ZnO, ZnS, and R-SO2 species was formed on the Zn anode.
- Zn||Zn cells demonstrated stable cycling for 800 hours, and Zn||Cu cells achieved 99.2% coulombic efficiency over 1800 cycles.
- A Zn||VO2 full cell exhibited enhanced performance with the Carr-modified electrolyte.
Conclusions:
- Carrageenan is an effective, eco-friendly additive for stabilizing the Zn anode in ZIBs.
- The use of Carr significantly improves the cycle life, coulombic efficiency, and overall performance of ZIBs.
- Carr-based electrolytes pave the way for the practical implementation of safer and more efficient ZIBs.
Related Concept Videos
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
341
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
341
03:45Formation of Complex Ions
23.3K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.3K
01:09Colloidal precipitates
515
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
515
01:19Complexation Equilibria: The Chelate Effect
460
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
460
02:58Crystal Field Theory - Octahedral Complexes
26.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.2K
00:56Extraction: Advanced Methods
420
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
420