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Molecular Spring Enabled High-Performance Anode for Lithium Ion Batteries.

Tianyue Zheng1, Zhe Jia2, Na Lin3

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Polymers
|April 11, 2019
PubMed
Summary
This summary is machine-generated.

New flexible conductive polymers enhance silicon/graphene anodes for lithium-ion batteries. These binders act like springs, maintaining electrode integrity for high energy density and capacity.

Keywords:
conductive polymer binderenergy storagehigh loadinglithium-ion batterymolecular springsilicon/graphene

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Silicon/graphene composite anodes are promising for high-energy lithium-ion batteries.
  • Electrode binders are crucial for maintaining mechanical and electrical integrity during cycling.
  • Traditional binders can limit performance due to poor flexibility and conductivity.

Purpose of the Study:

  • To develop novel flexible and conductive polymer binders for silicon/graphene anodes.
  • To improve the electrochemical performance and cycling stability of lithium-ion batteries.

Main Methods:

  • Synthetic incorporation of flexible butyl interconnection segments into poly(pyrene methacrylate) homopolymers and copolymers.
  • Fabrication of silicon/graphene composite anode electrodes using the novel polymer binders.
  • Electrochemical testing, including capacity measurements at high current rates.

Main Results:

  • The flexible butyl segments improved the polymer's ability to accommodate deformation.
  • Electrodes with the novel binders achieved high mass loading and areal capacity.
  • A remarkable area capacity exceeding 5 mAh/cm² and volumetric capacity over 1700 Ah/L were reached at 333 mA/g.

Conclusions:

  • The flexible conductive polymers effectively act as binders and adhesives, maintaining electrode integrity.
  • These novel binders facilitate superior electrochemical performance in silicon/graphene composite anodes.
  • The developed materials are suitable for high-energy lithium-ion battery applications.