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Related Concept Videos

Alkali Metals03:06

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).
Table 1: Properties of the alkali metals
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Scalable Syntheses of Graphene Oxide and Reduced Graphene Oxide using Cascade Design Oxidation and Highly Basic Reduction Reactions
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Correlation between Microstructure and Potassium Storage Behavior in Reduced Graphene Oxide Materials.

Yenchi Chen1, Lei Qin1, Yu Lei1

  • 1Shenzhen Key Laboratory for Graphene-Based Materials and Engineering Laboratory for Functionalized Carbon Materials, Shenzhen Geim Graphene Center, Graduate School at Shenzhen , Tsinghua University , Shenzhen 518055 , People's Republic of China.

ACS Applied Materials & Interfaces
|November 20, 2019
PubMed
Summary

Potassium-ion batteries (PIBs) show promise as alternatives to lithium-ion batteries (LIBs). Optimized reduced graphene oxide (rGO) anodes demonstrate superior cyclic stability for PIBs, overcoming challenges with graphite anodes.

Keywords:
anodegraphitizationmicrostructurepotassium-ion batteryreduced graphene oxide

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Potassium-ion batteries (PIBs) are explored as alternatives to lithium-ion batteries (LIBs) due to potassium's abundance and similar working mechanisms.
  • Commercial graphite anodes face challenges in PIBs due to large potassium ions, leading to poor cyclic stability and rate capability.
  • Reduced graphene oxide (rGO) emerges as a promising anode material for PIBs, offering more active sites and enlarged interlayer distances.

Purpose of the Study:

  • To investigate the influence of thermal treatment temperature on the microstructure of reduced graphene oxide (rGO).
  • To understand how rGO's microstructure affects its potassium-ion (K-ion) storage behavior and electrochemical performance in PIBs.
  • To optimize rGO as an anode material for enhanced cyclic stability and rate capability in PIBs.

Main Methods:

  • Synthesis and characterization of reduced graphene oxide (rGO) materials.
  • Thermal treatment of rGO at various temperatures, including 2500 °C.
  • Electrochemical testing of rGO anodes in potassium-ion battery configurations to evaluate cyclic stability and rate capability.

Main Results:

  • The potassium-ion storage behavior of rGO is significantly influenced by the thermal treatment temperature, correlating with microstructural changes.
  • rGO graphitized at 2500 °C exhibits an expanded interlayer distance and a long-range graphite-like structure.
  • This optimized rGO structure enables superior long-term cyclic stability for up to 2500 cycles in PIBs, accommodating volume changes during ion intercalation/deintercalation.

Conclusions:

  • Microstructure, particularly interlayer distance and graphitization, is critical for the performance of rGO anodes in PIBs.
  • High-temperature graphitization (2500 °C) yields rGO with enhanced structural integrity for robust potassium-ion storage.
  • Optimized rGO presents a viable anode material for high-performance and stable potassium-ion batteries.