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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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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...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Stabilizing the Solid-Electrolyte Interphase with Polyacrylamide for High-Voltage Aqueous Lithium-Ion Batteries.

Xu Hou1, Rui Wang2, Xin He1,3

  • 1Helmholtz-Institute Muenster (HI MS), IEK-12, Forschungszentrum Juelich GmbH, Corrensstr. 46, 48149, Muenster, Germany.

Angewandte Chemie (International Ed. in English)
|August 11, 2021
PubMed
Summary

Polyacrylamide (PAM) stabilizes the solid-electrolyte interphase (SEI) in water-in-salt electrolytes (WiSE), enhancing battery cycling stability. This additive improves LiMn2O4 ∥L-TiO2 full cells by minimizing water and densifying the SEI layer.

Keywords:
lithium-ion batteriespolymer additivesmall-angle neutron scatteringsolid-electrolyte interphase“water-in-salt” electrolyte

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Battery Technology

Background:

  • Water-in-salt electrolytes (WiSE) enable aqueous electrochemistry via solid-electrolyte interphase (SEI) formation.
  • Existing SEI layers in WiSE suffer from dissolution, mechanical damage, and continuous reforming, leading to poor battery cycling stability.

Purpose of the Study:

  • To introduce polyacrylamide (PAM) as a polymeric additive for stabilizing the SEI in WiSE.
  • To investigate the mechanism by which PAM enhances SEI stability and improves battery performance.

Main Methods:

  • Addition of 5 mol% PAM to a 21 mol kg-1 LiTFSI electrolyte.
  • Fabrication and testing of LiMn2O4 ∥L-TiO2 full cells.
  • Operando small-angle neutron scattering (SANS) and density functional theory (DFT) calculations to study SEI formation and evolution.

Main Results:

  • The LiMn2O4 ∥L-TiO2 full cell with PAM additive achieved 86% capacity retention after 100 cycles at 1 C.
  • PAM addition minimized free water molecules at the anode/electrolyte interface.
  • PAM accelerated TFSI- anion decomposition and resulted in a denser SEI layer.

Conclusions:

  • Polyacrylamide (PAM) effectively stabilizes the solid-electrolyte interphase (SEI) in water-in-salt electrolytes (WiSE).
  • PAM enhances the cycling stability of aqueous batteries by modifying SEI properties.
  • The study provides insights into SEI formation mechanisms using advanced characterization and computational methods.