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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Versatile MXenes for Aqueous Zinc Batteries.

Huan Liu1, Zijun Xin1, Bin Cao1

  • 1College of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an, 710054, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 20, 2023
PubMed
Summary

MXenes offer unique functions as electrode materials for aqueous zinc-ion batteries (AZIBs), enhancing performance as conductive substrates, active materials, and protective layers. This review summarizes MXene applications and challenges in AZIB technology.

Keywords:
MXenesaqueous zinc-ion batteriescathodeselectrolyteszinc anodes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous zinc-ion batteries (AZIBs) are attractive due to low cost, safety, and abundant resources.
  • MXenes are promising electrode materials for AZIBs, offering excellent conductivity, tunable surface chemistry, and structural flexibility.
  • The diverse functionalities of MXenes in AZIBs require systematic summarization.

Purpose of the Study:

  • To provide an up-to-date review of MXene-based electrode materials for AZIBs.
  • To focus on the unique functions and roles of MXenes in AZIB electrodes.
  • To highlight current technical challenges and future research directions for MXenes in AZIBs.

Main Methods:

  • Comprehensive literature review of MXene applications in aqueous zinc-ion batteries.
  • Categorization of MXene functions on both cathode and anode sides.
  • Analysis of MXene roles including conductive substrate, active material, host, protective layer, electrolyte additive, and separator modifier.

Main Results:

  • MXenes function as 2D conductive substrates, 3D frameworks, flexible supports, and coating layers in cathodes.
  • MXenes can serve as active materials or precursors for active materials in cathodes.
  • On the anode side, MXenes act as active material hosts, provide zinc metal surface protection, and modify electrolytes and separators.

Conclusions:

  • MXenes exhibit versatile functionalities crucial for advancing AZIB performance.
  • Systematic understanding of MXene roles is essential for optimizing AZIB design.
  • Addressing technical challenges is key to the widespread adoption of MXene-based AZIBs.