Adhesive PEG-based binder for aqueous fabrication of thick Li4Ti5O12 electrode

    Authors

    B. Tran; I. O. Oladeji; Z. D. Wang; J. Calderon; G. Y. Chai; D. Atherton;L. Zhai

    Comments

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    Abbreviated Journal Title

    Electrochim. Acta

    Keywords

    Aqueous process; Water-soluble; Binder; Li4Ti5O12; Lithium-ion batteries; LI-ION BATTERIES; LITHIUM-ION; ELECTROCHEMICAL PERFORMANCE; POLYMER; ELECTROLYTES; NEGATIVE ELECTRODE; COMPOSITE ELECTRODES; POLYACRYLIC-ACID; LIFEPO4; STABILITY; ANODE; Electrochemistry

    Abstract

    We report the first fully compressed Li4Ti5O12 electrode designed by an aqueous process. An adhesive, elastomeric, and lithium ion conductive PEG-based copolymer is used as a binder for the aqueous fabrication thick, flexible, and densely packed Li4Ti5O12 (LTO) electrodes. Self-adherent cathode films exceeding 200 mu m in thickness and withholding high active mass loadings of 28 mg/cm(2) deliver 4.2 mAh/cm(2) at C/2 rate. Structurally defect-free electrodes are fabricated by casting aqueous cathode slurries onto nickel foam, dried, and hard-calendared at 10 tons/cm(2). As a multifunctional material, the binder is synthesized by the copolymerization of poly(ethylene glycol) methyl ether methacrylate (PEGMA), methyl methacrylate (MMA), and isobutyl vinyl ether (IBVE) in optimal proportions. Furthermore, coordinating the binder with lithium salt is necessary for the electrode to function. (C) 2012 Elsevier Ltd. All rights reserved.

    Journal Title

    Electrochimica Acta

    Volume

    88

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    536

    Last Page

    542

    WOS Identifier

    WOS:000315076300072

    ISSN

    0013-4686

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