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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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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Construction and Testing of Coin Cells of Lithium Ion Batteries
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Disulfide-Containing Crosslinked Polyaniline Cathode for Rechargeable Battery.

Jeong-Min Lee, Ye-Ji Jung, A-Ran Lee

    Journal of Nanoscience and Nanotechnology
    |January 5, 2016
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    This study enhances polymer electrodes by crosslinking polyaniline with disulfide bonds, improving charge/discharge capacity. However, higher disulfide content reduced conductivity and cycle life.

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    Area of Science:

    • Materials Science
    • Electrochemistry
    • Polymer Chemistry

    Background:

    • Polymer electrodes offer eco-friendly, flexible, and cost-effective alternatives to lithium metal cathodes.
    • A key limitation of polymer electrodes is their generally lower charge/discharge capacity.
    • Sulfur compounds possess high theoretical capacity but suffer from poor electronic conductivity.

    Purpose of the Study:

    • To enhance the electrical performance of polymer electrodes.
    • To improve the charge/discharge capacity of polyaniline (PANI)-based cathodes.
    • To investigate the effect of disulfide crosslinking on electrode properties.

    Main Methods:

    • Synthesized crosslinked poly(9-amino-5,8-dihydro-1H,4H-2,3,6,7-tetrathia-anthracene) (PADTTAA)-co-PANI electrodes with varying ADTTAA ratios.
    • Analyzed surface elemental composition using X-ray photoelectron spectroscopy (XPS).
    • Evaluated electrochemical properties via cyclic voltammetry and charge-discharge testing.

    Main Results:

    • Successful synthesis of PADTTAA-co-PANI electrodes.
    • Increased ADTTAA content correlated with higher charge/discharge capacity.
    • Higher ADTTAA content led to decreased conductivity and reduced cycle life.

    Conclusions:

    • Disulfide crosslinking in PANI effectively enhances electrode charge/discharge capacity.
    • A trade-off exists between capacity enhancement and conductivity/cycle life.
    • Optimizing ADTTAA content is crucial for balancing performance metrics in these novel polymer electrodes.