Method of making self-standing electrodes supported by carbon nanostructured filaments

Abstract

A method of making self-standing electrodes supported by carbon nanostructured filaments. The present disclosure is directed to methods for production of composites of carbon nanotubes and electrode active material from liquid dispersions. Composites thusly produced may be used as self-standing electrodes without binder or collector. Moreover, the method of the present disclosure may allow more cost-efficient production while simultaneously affording control over nanotube loading and composite thickness.

Description

Background technique [0001] Single-walled carbon nanotubes (SWNTs) as additives in various matrices have become one of the most intensively studied application areas due to their excellent electrical and mechanical properties and high aspect ratio, which are crucial for composites . The use of SWNTs as performance-enhancing additives for battery electrodes is very promising in various applications. The core of the hybrid technique is based on a liquid process and consists of five steps required: a) synthesis of nanotubes, b) dispersion of nanotubes in a suitable solvent (de-aggregation), c) functionalization of nanotube surfaces (to prevent aggregation), d) mixing with binder, and e) mixing with active material (preparation of slurry). These preferences are not only expensive, but also degrade nanotube properties; for example, dispersion by ball milling, sonication, etc. leads to an inevitable reduction in aspect ratio and the introduction of defects, and thus requires more ...

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Problems solved by technology

These preferences are not only expensive, but also degrade nanotube properties; for example, dispersion by ball milling, sonication, etc. leads to an inevitable reduction in aspect ratio and the introduction of defects, and thus requires more nanotube loading (wt %) to improve performance

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