4.7 Article

A carbon ink for use in thin, conductive, non peelable, amphiphilic, antioxidant, and large-area current collector coating with enhanced lithium ion battery performance

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 598, Issue -, Pages 155-165

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.03.146

Keywords

Conductive layer; Ball milling; Current collector; Carbon coated copper foil; Lithium ion battery; Anode materials

Funding

  1. Ministry of Science and Technology [MOST 108-2636-E007-013, MOST 108-2622-8-007-016]
  2. MOST
  3. National Tsing Hua University [107Q2708E1]
  4. MOST [109-2636-E-007-011]

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A stable carbon ink composed of conductive carbon materials is reported for coating conducting layer on cathode/anode current collector for LIBs. The carbon-coated current collectors show superior performance in various battery types and can improve the adhesion of active materials, reducing interface resistance and avoiding peeling during charge/discharge process. The developed method enables efficient industrial production of high-quality carbon material inks for next-generation LIB-based current collectors.
We reported that a stable carbon ink composed of conductive carbon materials (graphene and super P), binder (sodium carboxymethyl cellulose (CMC)), interface active agent (sodium dodecyl sulfate (SDS)), and metal coupling agent ((3-aminopropyl)triethoxysilane (APTES)) for using in coating conducting layer on cathode/anode current collector for LIBs. Graphene materials are obtained using a low-cost graphite material (KS 6) and processing it via a wet ball-milling to exfoliate single layers into the ink. The ink can be coated on the LIB current collector in a large area by a doctor blade to form a carbon layer of about 1 mu m without overflow. Carbon-coated current collectors have amphiphilic properties, not peel off under extreme physical and chemical conditions, and resist oxidation under high temperature (200 degrees C) processing conditions. In addition, carbon-coated current collector are superior to the batteries using bare metal foil a current collectors in the LIB performance of graphite half-cell, graphite full-cell, LiFePO4 half-cell, and silicon-carbon full-cell. These results show that the carbon-coated metal foil can reduce the interface resistance with the active material and improves the adhesion of the active materials to the current collector, avoiding peeling off during charge/discharge process, thereby improving of LIBs performance. The developed method can produce high-quality, low-cost carbon material inks on a large scale through a simple and inexpensive process, and coat them evenly and finely on current collectors, making it possible to achieve efficient industrial and commercial perspectives for next-generation LIB-based current collectors. (C) 2021 Elsevier Inc. All rights reserved.

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