Development of Na0.5CoO2 Thick Film Prepared by Screen-Printing Process

Akihiro Tsuruta; Miki Tanaka; Masashi Mikami; Yoshiaki Kinemuchi; Yoshitake Masuda; Woosuck Shin; Ichiro Terasaki

doi:10.3390/ma13122805

Development of Na_0.5CoO₂ Thick Film Prepared by Screen-Printing Process

Materials (Basel). 2020 Jun 22;13(12):2805. doi: 10.3390/ma13122805.

Authors

Akihiro Tsuruta¹, Miki Tanaka¹, Masashi Mikami¹, Yoshiaki Kinemuchi¹, Yoshitake Masuda¹, Woosuck Shin¹, Ichiro Terasaki^{1

2}

Affiliations

¹ National Institute of Advanced Industrial Science and Technology (AIST), Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan.
² Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan.

Abstract

The Na_0.5Co_0.9Cu_0.1O₂ thick film with the same thermoelectric performance as a Na_0.5CoO₂ bulk was formed on an alumina substrate by the screen-printing process. The power factor exceeded 0.3 mW/K²m, with the resistivity of 3.8 mΩcm and the thermopower of 108 μV/K. The thick film without any cracks strongly adhered to the substrate. The high-quality thick film had been realized through the carefully designed and improved process, mixing NaCl to promote the anisotropic sintering of Na_0.5Co_0.9Cu_0.1O₂, inserting a CuO interlayer to adhere the film and substrate, and Co-Cu substituting Cu for Co to control the sintering temperature.

Keywords: screen print; sodium cobaltite; thermoelectric; thick film.

Grants and funding

Thermal Management Materials and Technology/New Energy and Industrial Technology Development Organization