Journal
ELECTROCHIMICA ACTA
Volume 132, Issue -, Pages 193-199Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.03.139
Keywords
Lithium battery; sodium battery; cobalt oxide; mesoporous; bowl-like
Categories
Funding
- National Science Foundation of China [20971117, 10979049, 21171015, J1030412]
- Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials [11zxfk26]
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Bowl-like hollow Co3O4 microspheres are prepared via a simple and low-cost route by thermally treating Co-containing resorcinol-formaldehyde composites gel in air. Scanning electron microscopy, transmission electron microscope and N-2 adsorption-desorption measurements demonstrate that these bowl-like hollow Co3O4 microspheres are composed of hollow inner cavities and outer shell walls (70 nm thickness), on which a considerable amount of mesopores centered around 5-17 nm size are distributed. When employed as the anode material for lithium-ion batteries, these bowl-like hollow Co3O4 microspheres exhibit extraordinary cycling performance (111% retention after 50 cycles owing to capacity rise), fairly high rate capacity (650 mAh g(-1) at 5 C) and enhanced lithium storage capacity. Meanwhile, the Na-storage behavior of Co3O4 as an anode material of Na-ion batteries is initially investigated based on such a hollow structure and it exhibits similar feature of discharge/charge profiles and a high initial discharge capacity but relatively moderate capacity retention compared with the Li-storage performance. (C) 2014 Elsevier Ltd. All rights reserved.
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