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Self-Repairable Silicon Anodes Using a Multifunctional Binder for High-Performance Lithium-Ion Batteries.

Yoga Trianzar Malik1, Seo-Yeon Shin1, Jin Il Jang1

  • 1Department of Chemistry, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul, 02707, South Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|December 20, 2022
PubMed
Summary
This summary is machine-generated.

A novel self-healing binder (polydioxythiophene:polyacrylic acid:phytic acid) enhances silicon anodes by autonomously repairing cracks during battery cycling. This innovation significantly improves structural integrity and electrochemical performance for next-generation batteries.

Keywords:
lithium-ion batteriesrate capabilityself-healable silicon anodes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Silicon anodes offer high theoretical capacity but suffer from electrode degradation due to large volume changes during cycling.
  • Pulverization and delamination of silicon anodes limit their practical application in high-performance batteries.

Purpose of the Study:

  • To design and synthesize a self-healable and stretchable binder for silicon anodes.
  • To improve the structural integrity and electrochemical performance of silicon anodes.

Main Methods:

  • Development of a multifunctional binder: polydioxythiophene:polyacrylic acid:phytic acid (PEDOT:PAA:PA, PDPP).
  • Fabrication of silicon anodes utilizing the self-healing binder.
  • Electrochemical testing to evaluate cycling stability, capacity retention, and rate capability.
  • Demonstration of autonomous crack self-healing under practical battery operating conditions.

Main Results:

  • The self-healing binder (PDPP) effectively repairs cracks and damages in silicon anodes during cycling.
  • Silicon anodes with the PDPP binder achieved a reversible capacity of 2312 mAh g-1 after 100 cycles with 94% initial Coulombic efficiency.
  • The binder enhanced Li-ion diffusivity and electronic conductivity, leading to excellent rate capability (2084 mAh g-1 at 5 C).
  • Autonomous self-healing of artificially created cracks was demonstrated under operational conditions.

Conclusions:

  • The developed self-healing binder provides silicon anodes with exceptional structural integrity and self-repair capabilities.
  • This approach significantly overcomes the limitations of silicon anodes, offering superior performance compared to existing technologies.
  • The self-healing binder holds great promise for advancing high-capacity, long-lasting silicon-based batteries.