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Related Concept Videos

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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Artificial Graphite-Based Silicon Composite Anodes for Lithium-Ion Batteries.

Sae Min Park1, Tejaswi Tanaji Salunkhe1, Ji Hyeon Yoo1

  • 1Department of Chemical, Biological and Battery Engineering, Gachon University, Seongnam-si 13120, Gyeonggi-do, Republic of Korea.

Nanomaterials (Basel, Switzerland)
|December 17, 2024
PubMed
Summary
This summary is machine-generated.

A novel porous artificial carbon-silicon composite anode was developed for advanced lithium-ion batteries. This material shows enhanced lithium-ion diffusion and high-rate capability, making it a promising anode system.

Keywords:
Li-ion batteriesanodeartificial carbonhigh-energy ball milling

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Developing advanced anodes is crucial for improving lithium-ion battery performance.
  • Silicon (Si) offers high theoretical capacity but suffers from volume expansion issues.
  • Porous artificial carbon (PAC) can mitigate Si volume expansion and enhance conductivity.

Purpose of the Study:

  • To synthesize and electrochemically evaluate a novel porous artificial carbon (PAC)-Si composite anode.
  • To enhance the pore structure and silicon distribution using ammonium bicarbonate (ABC).
  • To assess the material's potential for high-performance lithium-ion batteries.

Main Methods:

  • High-energy ball-milling with ammonium bicarbonate (ABC) to create the PAC-Si composite.
  • Material characterization using X-ray diffraction (XRD) and transmission electron microscopy (TEM).
  • Electrochemical performance evaluation via galvanostatic intermittent titration (GITT) and battery cycling.

Main Results:

  • The PAC-Si-CB-ABC composite exhibited improved pore size and surface area with uniform Si distribution.
  • Galvanostatic intermittent titration (GITT) showed superior lithium-ion diffusion compared to conventional graphite.
  • The PAC(55%)-Si(45%)-CB-ABC electrode achieved a reversible capacity of 850 mAh g-1 at 100 mA g-1 and 600 mAh g-1 at 2000 mA g-1.
  • A full cell with an NCM622 cathode demonstrated reversible cyclability of 128.9 mAh g-1 and an energy density of 323.3 Wh kg-1.

Conclusions:

  • The developed PAC-Si-CB-ABC composite effectively accommodates silicon volume changes and enhances electrochemical reactions.
  • The composite demonstrates excellent lithium-ion diffusion and high-rate performance.
  • This novel anode material shows significant promise for next-generation lithium-ion batteries.