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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...

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Updated: Dec 21, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Molecular Sieve-Modified Separator for High-Performance Lithium-Ion Batteries.

Yuqiong Kang¹, Changjian Deng², Zhengyang Wang¹

¹Division of Energy and Environment, Engineering Laboratory for the Next Generation Power and Energy Storage Batteries Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China.

Nanoscale Research Letters

|May 15, 2020

Summary

This study introduces a novel lithium-ion battery separator using molecular sieves (MS) integrated with PVDF-HFP@PAN. The new separator enhances electrolyte wettability and significantly reduces moisture, improving battery performance and lifespan.

Keywords:

Electrospinning Lithium-ion batteries Molecular sieves Separator Water absorption

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Lithium-ion batteries (LIBs) are crucial for energy storage, but their performance is limited by separators.
Commercial separators often have poor electrolyte wettability and safety concerns.
Hazardous molecules like water and HF degrade battery lifespan.

Purpose of the Study:

To develop a functionalized separator for LIBs with improved electrolyte wettability and safety.
To enhance the overall quality and longevity of lithium-ion batteries.
To address limitations of current commercial battery separators.

Main Methods:

Fabrication of a poly(vinylidene fluoride-co-hexafluoropropylene)@polyacrylonitrile (PVDF-HFP@PAN) separator.
Modification of the separator with 4-Å molecular sieves (MS) using a hydrothermal method.
Characterization of thermal stability, electrolyte wettability, and moisture adsorption capabilities.

Main Results:

The MS@PVDF-HFP@PAN separator demonstrated high thermal stability and excellent carbonate electrolyte wettability.
It effectively reduced internal battery moisture content to 13 ppm, enhancing electrolyte quality.
The separator exhibited excellent rate capability (80.6% capacity retention from 0.2 to 5 C) and superior cycle life (98.6% retention after 100 cycles for NMC622).

Conclusions:

The developed MS@PVDF-HFP@PAN separator significantly improves lithium-ion battery performance and safety.
This functionalized separator offers a promising alternative to conventional battery separators.
The integration of molecular sieves is an effective strategy for enhancing battery electrolyte quality and operational stability.