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Related Concept Videos

Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Polymer Coating Enabling a Durable Conductive Network for Si-Based Lithium-Ion Batteries.

Ziren Long1, Shulan Mao1,2, Shichao Zhang1

  • 1State Key Laboratory of Chemical Engineering, Institute of Pharmaceutical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.

Nano Letters
|May 20, 2025
PubMed
Summary

A new polymer coating on silicon nanoparticles (SiNPs) enhances battery anode durability and performance. This innovation addresses issues with large surface area reactions and volume changes, leading to better energy storage.

Keywords:
conductive networknano silicon anodespolymer coatingsolid electrolyte interphase

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Silicon nanoparticles (SiNPs) are promising high-capacity anodes for batteries.
  • Their large surface area causes detrimental interfacial side reactions and impairs kinetic performance.
  • Volume fluctuations during cycling lead to electrical contact failure and reduced electrode durability.

Purpose of the Study:

  • To enhance the durability and electrochemical performance of SiNPs for battery anodes.
  • To mitigate interfacial side reactions and electrical contact failure in SiNP anodes.
  • To improve the mechanical integrity and long-term cycling stability of silicon-based anodes.

Main Methods:

  • Applied a uniform allyltrimethoxysilane-derived polymer (AP) coating to SiNPs.
  • Investigated the effect of the AP coating on the conductive network and triphasic contact integrity.
  • Evaluated the mechanical integrity of the electrode and the properties of the induced solid electrolyte interphase (SEI) layer.

Main Results:

  • The AP coating enhanced the durability of the conductive network, strengthening SiNP, conductive additive, and binder interactions.
  • The coating effectively mitigated electrical contact failure caused by volume fluctuations during cycling.
  • The optimized Si@AP anode demonstrated a reversible capacity of 1300 mAh g-1 after 200 cycles and a rate capacity of 842 mAh g-1 at 5 C.

Conclusions:

  • In situ polymer coatings significantly enhance the mechanical and electrochemical performance of Si-based anodes.
  • The AP coating improves electrode integrity and induces a robust SEI layer, preventing electrolyte penetration.
  • This approach offers a viable strategy for developing high-performance silicon anodes for advanced energy storage applications.