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Related Experiment Video

Updated: Nov 6, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Constructing Densely Compacted Graphite/Si/SiO2 Ternary Composite Anodes for High-Performance Li-Ion Batteries.

Hao Wu1, Lihua Zheng1, Ning Du2

  • 1State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

ACS Applied Materials & Interfaces
|May 6, 2021
PubMed
Summary

Engineered compact graphite/silicon/silicon dioxide composite anodes achieve higher areal capacity for lithium-ion batteries by optimizing particle packing. This innovative design enhances energy density and longevity for electric vehicles and electronics.

Keywords:
areal capacitygraphitelithium-ion batteriessiliconternary composites

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Graphite is the dominant anode material for lithium-ion batteries (LIBs) but is nearing its theoretical capacity limits.
  • Enhancing anode capacity often involves blending silicon (Si) with graphite, but this can reduce areal capacity due to void spaces and poor particle distribution.
  • Developing advanced anode materials is crucial for next-generation LIBs in electric vehicles and consumer electronics.

Purpose of the Study:

  • To design and investigate compact ternary composite anodes of graphite/Si/SiO2 for enhanced areal capacity in LIBs.
  • To address the issue of reduced areal capacity in graphite-Si composite anodes caused by void spaces and incompatible particle sizes.
  • To establish a packing model for densely compacted anodes and verify its effectiveness through experimental validation.

Main Methods:

  • Fabrication of graphite/Si/SiO2 ternary composite anodes with homogeneously dispersed Si/SiO2 clusters in graphite interstitial spaces.
  • Electrochemical performance testing, including capacity, cycle life, coulombic efficiency, and areal capacity measurements.
  • Development and experimental verification of a packing model to guide the design of densely compacted anodes.

Main Results:

  • The graphite/Si/SiO2 composite electrodes achieved a high gravimetric capacity of 553.6 mAh g-1 after 700 cycles with 95.2% capacity retention.
  • Demonstrated high coulombic efficiency (average 99.68% from 2nd to 200th cycles) and sustained areal capacities over 1.75 mAh cm-2 at a high loading of 4.04 mg cm-2.
  • The Si/SiO2 clusters effectively filled void spaces, significantly increasing packing density and areal capacity compared to pure graphite.

Conclusions:

  • The rational design of compact graphite/Si/SiO2 ternary composites offers a viable strategy to overcome the limitations of traditional graphite anodes.
  • Optimized dispersion of Si/SiO2 clusters within graphite interstitial spaces enhances packing density, leading to superior areal capacity and long-term stability.
  • This approach provides an effective solution for developing high-performance graphite-Si composite anodes for advanced lithium-ion cells.