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Non-aqueous Electrode Processing and Construction of Lithium-ion Coin Cells
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Constructing a Stable Integrated Silicon Electrode with Efficient Lithium Storage Performance through

Fenghui Li1,2, Hao Wu1, Hong Wen1

  • 1College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

ACS Applied Materials & Interfaces
|February 6, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a stable silicon (Si) electrode using graphene sheets, Si nanowires, and carbon nanotubes for advanced lithium-ion batteries, improving cycling stability and performance.

Keywords:
PAN cyclization processintegrated electrodelithium-ion batterymultidimensional structural designsilicon anode

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Silicon (Si) is a promising anode material for next-generation lithium-ion batteries.
  • Challenges include low conductivity and significant volume changes during cycling, impacting stability and commercialization.
  • Rational electrode architecture design is crucial for enhancing Si performance.

Purpose of the Study:

  • To fabricate a stable integrated silicon electrode with enhanced electrochemical performance.
  • To address the limitations of silicon anodes through a novel structural design.
  • To evaluate the cycling stability, rate capability, and energy density of the developed electrode.

Main Methods:

  • Fabrication of a stable integrated Si electrode using 2D graphene sheets (G), 1D Si nanowires (SiNW), and carbon nanotubes (CNT).
  • Utilized the cyclization process of polyacrylonitrile (PAN) to create a conformal coating of cyclized PAN (cPAN) and CNT.
  • Characterized the electrode structure and electrochemical performance, including cycling stability and rate capability.

Main Results:

  • The integrated electrode features a G/SiNW framework coated with cPAN and CNT, creating interconnected transport channels.
  • The electrode demonstrated high conductivity and resistance to volume changes, enhancing rate performance and cyclability.
  • Achieved a gravimetric capacity of 650 mAh g-1 after 1000 cycles at 3.0 A g-1.
  • A full cell with a LiNi0.5Co0.2Mn0.3O2 cathode retained 84.8% capacity after 160 cycles at 2.0 C and reached 435 Wh kg-1 energy density at 0.5 C.

Conclusions:

  • The multidimensional structural design significantly enhances the cycling stability, rate performance, and structural integrity of silicon anodes.
  • The developed electrode material shows great potential for practical applications in high-energy-density lithium-ion batteries.
  • This study provides valuable insights into electrode-level structural design for silicon-based battery materials.