Substrate-induced coagulation (SIC) of nano-disperse carbon black in non-aqueous media: A method of manufacturing highly conductive cathode materials for Li-ion batteries by self-assembly

Angelika Basch, Bernhard Gollas*, Roger Horn, Jürgen O. Besenhard

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Substrate-induced coagulation (SIC) is a coating process based on self-assembly for coating different surfaces with fine particulate materials. The particles are dispersed in a suitable solvent and the stability of the dispersion is adjusted by additives. When a surface, pre-treated with a flocculant e.g. a polyelectrolyte, is dipped into the dispersion, it induces coagulation resulting in the deposition of the particles on the surface. A non-aqueous SIC process for carbon coating is presented, which can be performed in polar, aprotic solvents such as N-Methyl-2-pyrrolidinone (NMP). Polyvinylalcohol (PVA) is used to condition the surface of substrates such as mica, copper-foil, silicon-wafers and lithiumcobalt oxide powder, a cathode material used for Li-ion batteries. The subsequent SIC carbon coating produces uniform layers on the substrates and causes the conductivity of lithiumcobalt oxide to increase drastically, while retaining a high percentage of active battery material.

    Original languageEnglish
    Pages (from-to)169-176
    Number of pages8
    JournalJournal of Applied Electrochemistry
    Volume35
    Issue number2
    DOIs
    Publication statusPublished - Feb 2005

    Keywords

    • Carbon coating
    • Composite electrode
    • Dip-coating
    • Li-ion battery
    • Non-aqueous dispersion
    • Substrate-induced coagulation (SIC)

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Electrochemistry
    • Materials Chemistry

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