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Related Concept Videos

Ion Exchange01:17

Ion Exchange

518
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
518

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A Function-Oriented Binder with Exceptional Interface Ion Transport and Impurity Tolerance for Hard Carbon Anode.

Xinyu Qiao1, Guobiao Jin1, Rui Liu1

  • 1School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|March 11, 2025
PubMed
Summary

A new composite binder, LA/PEO, enhances biomass-derived hard carbon anodes for sodium-ion batteries. This binder improves efficiency, capacity, and stability, even with impurities, paving the way for advanced energy storage.

Keywords:
binderhard carbon anodeimpurity toleranceinterfacial stabilityion transportsodium‐ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Hard carbon is the primary anode material in commercial sodium-ion batteries.
  • Intrinsic defects and impurities in hard carbon limit battery performance and development.
  • Biomass-derived hard carbons offer a sustainable alternative but face similar challenges.

Purpose of the Study:

  • To develop a novel composite binder (LA/PEO) to overcome the limitations of hard carbon anodes in sodium-ion batteries.
  • To improve the initial coulombic efficiency (ICE) and reversible capacity of biomass-derived hard carbons.
  • To enhance the tolerance of hard carbon anodes to impurities and improve interfacial stability.

Main Methods:

  • Synthesis of an acrylonitrile copolymer and poly(ethylene oxide) (LA/PEO) composite binder.
  • Fabrication of hard carbon electrodes using the developed HC-LA/PEO composite binder.
  • Electrochemical performance testing, including ICE, reversible capacity, and cycling stability.
  • Analysis of the binder's interaction with hard carbon and the solid electrolyte interphase (SEI) layer.

Main Results:

  • The HC-LA/PEO composite achieved an ICE of 91.1% and a reversible capacity of 341.12 mAh g⁻¹.
  • The binder demonstrated superior tolerance to transition metal ion impurities, even increasing reversible capacity.
  • Function-oriented design via hydrogen bonding and polar interactions enhanced mechanical strength and reduced electrode brittleness.
  • A more uniform and stable SEI layer was formed, improving interfacial stability and ion transport.

Conclusions:

  • The LA/PEO composite binder effectively mitigates the adverse effects of hard carbon defects and impurities.
  • This binder significantly boosts the performance of biomass-derived hard carbon anodes in sodium-ion batteries.
  • The LA/PEO binder acts as an intelligent gatekeeper, unlocking the full potential of hard carbons for energy storage applications.