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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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Polyacrylonitrile Separator for High-Performance Aluminum Batteries with Improved Interface Stability.

Giuseppe Antonio Elia¹, Jean-Baptiste Ducros², Dane Sotta²

¹Research Center of Microperipheric Technologies, Technische Universität Berlin , Gustav-Meyer-Allee 25, D-13355 Berlin, Germany.

ACS Applied Materials & Interfaces

|October 19, 2017

Summary

Most commercial battery separators fail in reactive aluminum battery electrolytes. A novel electrospun polyacrylonitrile (PAN) separator demonstrates excellent stability and compatibility, improving aluminum deposition and performance in aluminum-graphite cells.

Keywords:

PAN aluminum batteries electrospinning ionic liquid polyacrylonitrile separator

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Rechargeable aluminum batteries offer high theoretical capacity but face challenges with electrolyte-separator compatibility.
Conventional battery separators often degrade in aggressive electrolytes like 1-ethyl-3-methylimidazolium chloride:aluminum trichloride (EMIMCl:AlCl3).

Purpose of the Study:

To evaluate commercial battery separators for aluminum batteries.
To develop and characterize a novel, highly stable separator for high-performance aluminum batteries.

Main Methods:

Overall evaluation of commercially available battery separators.
Preparation of a polyacrylonitrile (PAN) separator using electrospinning.
Characterization of PAN separator morphology, thermal stability, and air permeability.
Electrochemical testing of PAN separators in aluminum/graphite cells.

Main Results:

Most commercial separators are unstable in EMIMCl:AlCl3 electrolyte.
The electrospun PAN separator exhibits excellent stability, compatibility, and improved aluminum interface stability.
PAN separators promote homogeneous aluminum deposition and enhance cell capacity compared to glass fiber separators.

Conclusions:

The novel PAN separator is a promising candidate for high-performance and reliable aluminum batteries.
Electrospun PAN separators overcome limitations of conventional materials in reactive electrolytes.
This development advances the potential of emerging aluminum battery technology.