The nanostructured
materials represent the center of fundamental advances to design new era
electrodes for high energy density batteries. Especially, one-dimensional
nanomaterials are recognized as a solution due to their large surface area,
short diffusion distance and high volume accommodation ability. In this sense,
first in literature a comparative study has been done to examine the
electrochemical performances of differently fabricated transition metal oxide molybdate
powders: lithium storage capabilities of nickel-cobalt-molybdate composite is
compared to that of the cobalt oxide decorated nickel molybdate powders. To
measure the effect of cobalt atom, bare nickel molybdate powders have been also
fabricated and tested. The lithiation mechanism of these electrodes are
discussed based on the cyclic voltammetry curvatures and the SEI layer
formation on the electrodes and the electrode/electrolyte stability upon
cycling are analyzed following the electrochemical impedance spectroscopy test
results (after 1st,2nd and 4th cycles). The outcome of characterizations reveal
that the addition of cobalt changes the powder morphology and improves the
electrochemical performance of the electrode. Among three samples, the cobalt oxide
decorated nickel molybdate performs higher retention and rate performance since
the top layer promotes more stable electrode/electrolyte interface providing a
capacity of 290 mAh/g after 100 cycles. The rate performance of the sample is
also found promising, the electrode delivers 200 mAh/g even at 400mA/g rate.
Metal molybdates lithium ion batteries hydrothermal method anode
Birincil Dil | İngilizce |
---|---|
Konular | Malzeme Mühendisliği (Diğer) |
Bölüm | Araştırma Makalesi |
Yazarlar | |
Yayımlanma Tarihi | 1 Şubat 2020 |
Gönderilme Tarihi | 29 Temmuz 2019 |
Kabul Tarihi | 10 Ekim 2019 |
Yayımlandığı Sayı | Yıl 2020 |
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.