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Ion Exchange

Ion Exchange

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 basic...

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Updated: Jun 27, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Tailoring Electrode-Electrolyte Interfaces in Lithium-Ion Batteries Using Molecularly Engineered Functional Polymers.

Laisuo Su¹, Jamie L Weaver², Mitchell Groenenboom²

¹Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States.

ACS Applied Materials & Interfaces

|February 22, 2021

Summary

Polymer coatings enhance lithium-ion battery performance by improving ion transport and stability. Poly(3,4-ethylenedioxythiophene) (PEDOT) coatings significantly boost the cycle life of lithium cobalt oxide electrodes.

Keywords:

LiCoO2 chemical vapor deposition polymerization density functional theory calculation electrode−electrolyte interface lithium-ion batteries poly(3,4-ethylenedioxythiophene)surface engineering synchrotron X-ray characterization

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Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing

Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing

Published on: March 7, 2018

Area of Science:

Materials Science
Electrochemistry
Polymer Chemistry

Background:

Electrode-electrolyte interfaces (EEIs) critically influence lithium-ion battery (LIB) performance, affecting rate capability, cycling stability, and safety.
Developing stable EEIs with efficient Li+ transport is essential for advanced LIBs.

Purpose of the Study:

To investigate Li+ kinetics at EEIs modified by nanoscale polymer thin films.
To evaluate the impact of different polymer coatings on LiCoO2 electrode performance for LIBs.

Main Methods:

Chemical vapor deposition (CVD) polymerization for creating nanoscale polymer thin films.
Operando synchrotron X-ray diffraction to study Li+ transport and electrode behavior.
Electrochemical testing of LiCoO2 electrodes with polymer coatings.

Main Results:

Poly(3,4-ethylenedioxythiophene) (PEDOT) coatings demonstrated superior Li+ transport due to optimal binding energy and sites.
PEDOT coatings improved current homogeneity, reduced cobalt dissolution, and inhibited electrolyte decomposition.
LiCoO2 electrodes with PEDOT coatings exhibited a >1700% increase in 4.5 V cycle life at C/2.
Other polymer coatings showed detrimental effects on electrode performance.

Conclusions:

PEDOT-based artificial coatings enable fast charging and enhance the cycle life of LiCoO2 electrodes.
The study provides guidelines for selecting and designing polymers to engineer stable and efficient EEIs for advanced LIBs.