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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Updated: Feb 7, 2026

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Dynamic Self-Organizing Lithium Bonds for High Energy Density Lithium Batteries.

Wenting Wang1, Jiaxue Yu1, Hongjiang Yu1,2

  • 1State Key Laboratory of Coordination Chemistry, Key Laboratory of High-Performance Polymer Material and Technology of MOE, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, P. R. China.

Angewandte Chemie (International Ed. in English)
|February 6, 2026
PubMed
Summary

Methacrylate polyhedral oligomeric silsesquioxane (MAPOSS) enables dynamic lithium storage through unique silicon-carbonyl interactions. This novel approach enhances silicon anode performance and battery energy density.

Keywords:
Si anodebinderlithium batteriespolyhedral oligomeric silsesquioxaneself‐organizing lithium bonds

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Understanding lithium storage mechanisms in silicon anodes is crucial for improving battery performance.
  • The complexity of silicon anode compositions hinders accurate prediction and validation of reaction processes.
  • A well-defined silicon-based model compound is needed to elucidate lithium-silicon bonding.

Purpose of the Study:

  • To investigate the lithium-silicon bonding mechanism using methacrylate polyhedral oligomeric silsesquioxane (MAPOSS) as a model compound.
  • To explore the role of synergistic interactions in reversible lithium-ion storage.
  • To evaluate MAPOSS as a binder for graphite anodes and its impact on battery performance.

Main Methods:

  • Detailed characterization of MAPOSS morphological and chemical structural changes before and after cycling.
  • Density functional theory (DFT) simulations to support experimental findings.
  • Electrochemical testing of graphite anodes utilizing polymerized MAPOSS as a binder.

Main Results:

  • Discovery of "Dynamic Self-Organizing Lithium Bonds" resulting from synergistic interactions between silicon and carbonyl groups in MAPOSS.
  • Demonstration of reversible dynamic Li+ ion storage facilitated by these interactions.
  • MAPOSS-bound graphite anodes achieved a specific capacity exceeding 450 mAh g-1 over 250 cycles at 0.2 C.

Conclusions:

  • MAPOSS promotes reversible lithium-ion storage via unique dynamic self-organizing lithium bonds.
  • MAPOSS serves as an effective binder for graphite anodes, enhancing electrochemical performance.
  • Integration of MAPOSS in full cells can reduce the N/P ratio, potentially increasing overall battery energy density.