TY - JOUR
T1 - Electrochemical properties of micron-sized Co3O4hollow powders consisting of size controlled hollow nanospheres
AU - Park, Jin Sung
AU - Cho, Jung Sang
AU - Kim, Jong Hwa
AU - Choi, Yun Ju
AU - Kang, Yun Chan
N1 - Funding Information:
This work was supported by a National Research Foundation of Korea grant funded by the Korea government (MEST) ( NRF-2015R1A2A1A15056049 ). This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning , granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea ( 201320200000420 and 20153030091450 ).
Publisher Copyright:
© 2016 Elsevier B.V.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2016
Y1 - 2016
N2 - Micron-sized Co3O4hollow powders consisting of size controlled hollow nanospheres are prepared by applying Ostwald ripening and Kirkendall effect to the spray pyrolysis process. The Co-C composite powders uniformly dispersed with different sizes of metallic Co nanocrystals are formed by reduction of the cobalt oxide-carbon composite powders prepared using spray pyrolysis. Subsequent oxidation of the Co-C composite powders with filled structures forms the micron-sized Co3O4hollow powders consisting of size controlled hollow nanospheres. The mean sizes of the Co3O4hollow nanospheres oxidized from Co-C composite powders formed at reduction temperatures of 400, 600, and 800 °C are 37, 55, and 73 nm, respectively. The discharge capacities of the Co3O4powders formed from the Co-C composite powders reduced at temperatures of 400, 600, and 800 °C for the 300thcycle are 644, 702, and 660 mA h g−1, respectively, and their capacity retentions calculated from the second cycle are 81, 86, and 84%, respectively. The porous-structured Co3O4powders formed from the Co-C composite powders reduced at 800 °C show slightly better rate performance than those of the other two samples.
AB - Micron-sized Co3O4hollow powders consisting of size controlled hollow nanospheres are prepared by applying Ostwald ripening and Kirkendall effect to the spray pyrolysis process. The Co-C composite powders uniformly dispersed with different sizes of metallic Co nanocrystals are formed by reduction of the cobalt oxide-carbon composite powders prepared using spray pyrolysis. Subsequent oxidation of the Co-C composite powders with filled structures forms the micron-sized Co3O4hollow powders consisting of size controlled hollow nanospheres. The mean sizes of the Co3O4hollow nanospheres oxidized from Co-C composite powders formed at reduction temperatures of 400, 600, and 800 °C are 37, 55, and 73 nm, respectively. The discharge capacities of the Co3O4powders formed from the Co-C composite powders reduced at temperatures of 400, 600, and 800 °C for the 300thcycle are 644, 702, and 660 mA h g−1, respectively, and their capacity retentions calculated from the second cycle are 81, 86, and 84%, respectively. The porous-structured Co3O4powders formed from the Co-C composite powders reduced at 800 °C show slightly better rate performance than those of the other two samples.
KW - Anode material
KW - Cobalt oxide
KW - Kirkendall diffusion
KW - Lithium ion battery
KW - Ostwald ripening
KW - Spray pyrolysis
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U2 - 10.1016/j.jallcom.2016.07.233
DO - 10.1016/j.jallcom.2016.07.233
M3 - Article
AN - SCOPUS:84981513609
VL - 689
SP - 554
EP - 563
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
ER -