Related Experiment Video
Updated: May 6, 2026
12:28
Non-aqueous Electrode Processing and Construction of Lithium-ion Coin Cells
Published on: February 1, 2016
21.5K
Nano-confined Si@C composites with excellent lithium-ion storage performance derived from a POSS-based covalent
Yu Zhang1, Yanan Xu1, Shupeng Zhao1
1State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China. hbdu@nju.edu.cn.
Dalton Transactions (Cambridge, England : 2003)
|January 13, 2025
Summary
Researchers developed novel silicon-carbon (Si@C) anode materials using a bottom-up approach. These advanced materials demonstrate exceptional lithium-ion battery performance, retaining high capacity over 1000 cycles.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Silicon anodes offer high theoretical capacity but suffer from poor cycling stability due to volume expansion during lithiation.
- Strategies to mitigate these issues include particle size reduction and integration with conductive carbon matrices.
- Polyhedral oligomeric silsesquioxanes (POSS) present a potential building block for advanced anode materials.
Purpose of the Study:
- To synthesize novel Si@C anode materials using a bottom-up strategy.
- To enhance the lithium-ion storage performance and cycling stability of silicon-based anodes.
- To explore the application of octa-aminopropyl polyhedral oligomeric silsesquioxane (NH2-POSS) in energy storage.
Main Methods:
- A bottom-up synthesis strategy involving cross-linking NH2-POSS with terephthalaldehyde.
- High-temperature treatment and low-temperature liquid reduction to form Si@C nanospheres.
- Electrochemical testing of the synthesized Si@C materials as anodes in lithium-ion batteries.
Main Results:
- Successfully synthesized Si@C nanospheres with ultra-thin silicon stripes embedded in a continuous carbon framework.
- Achieved excellent lithium-ion storage performance, retaining 1363 mA h g-1 after 1000 cycles at 0.5 A g-1.
- Demonstrated a capacity retention of 182% of the first cycle capacity after activation, significantly outperforming graphite.
Conclusions:
- The developed Si@C nanospheres effectively address the volume expansion and conductivity issues of silicon anodes.
- This approach offers a promising route for designing advanced silicon-based anode materials for high-performance lithium-ion batteries.
- Highlights the potential of POSS derivatives in the field of energy storage materials.
Related Concept Videos
02:18Network Covalent Solids
12.9K
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...
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...
12.9K
01:25MOS Capacitor
1.8K
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
1.8K