Preparation, formulation and deposition of mica flake supported cobalt oxide for nanostructured lithium ion battery anodes
| Autor: | Julien Bachmann, Yanlin Wu, Anna Sophie Rink, Robin N. Klupp Taylor, Alexandra Helmer, Julian D. Esper |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Oxide chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Lithium-ion battery 0104 chemical sciences Dielectric spectroscopy chemistry.chemical_compound Chemical engineering chemistry Mechanics of Materials Electrode Cyclic voltammetry 0210 nano-technology Cobalt oxide Cobalt |
| Zdroj: | Advanced Powder Technology. 30:3127-3134 |
| ISSN: | 0921-8831 |
| Popis: | We describe the fabrication and morphological and electrochemical characterisation of lithium ion battery anodes whereby the active material is supported on flake-like microparticles. Using various physical analytical techniques we verify that nanostructured cobalt (II, III) oxide can be directly grown onto commercial titanium dioxide-coated mica flakes by a liquid phase oxidation route. We then investigate the formulation and deposition of this material along with carbon black in order to form electrodes. Here we consider two binder/solvent systems, one widely used based on polyvinylidene fluoride in N-methy-2-pyrrolidone, and one more recently identified based on sodium alginate in water. We show that the latter system is preferable for the formation of anodes using the cobalt oxide coated flake-like particles as it leads to a more homogeneous distribution of active and conductive material in the electrode. Using cyclic voltammetry and electrochemical impedance spectroscopy we show that this feature improves the access to active material and facilitates efficient charge transfer in the electrode while maintaining electrode integrity. Moreover, an electrode based on the alginate binder exhibited a high reversible specific capacity of 650 mAh/g along with 84.8% capacity retention after 70 cycles. Overall our study indicates the promise of including shape anisotropic particles such as microflakes in battery electrodes. |
| Databáze: | OpenAIRE |
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