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Alkali Metals

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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Tin-based composite anodes for potassium-ion batteries.

Irin Sultana1, Thrinathreddy Ramireddy1, Md Mokhlesur Rahman1

  • 1Institute for Frontier Materials, Deakin University, 75 Pigdons Rd, Waurn Ponds, Geelong, VIC 3216, Australia. alexey.glushenkov@deakin.edu.au.

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This study introduces tin (Sn)-based anodes for potassium (K) batteries, demonstrating reversible alloying and de-alloying. The material exhibits promising capacities around 150 mA h g(-1) at low potentials.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Potassium-ion batteries (KIBs) are a promising alternative to lithium-ion batteries due to potassium's abundance and low cost.
  • Developing high-performance anode materials is crucial for advancing KIB technology.

Purpose of the Study:

  • To investigate the electrochemical performance of tin (Sn)-based materials as anodes in potassium cells.
  • To explore the alloying/de-alloying mechanism of Sn with potassium.

Main Methods:

  • Electrochemical testing of Sn-based anodes in potassium half-cells.
  • Cyclic voltammetry and galvanostatic charge-discharge cycling.
  • Ex-situ characterization (e.g., XRD, SEM) to analyze the electrode material after cycling.

Main Results:

  • The Sn-based anode shows electrochemical activity at low potentials versus K/K(+).
  • Reversible alloying and de-alloying reactions between Sn and K were experimentally confirmed.
  • Achieved specific capacities of approximately 150 mA h g(-1).

Conclusions:

  • Sn-based materials are viable anode candidates for potassium-ion batteries.
  • The reversible alloying mechanism suggests potential for stable cycling.
  • Further optimization of Sn-based anodes could lead to improved battery performance.