Abstract
Abstract Spherical micron-sized MnS-C and MnO-C composite powders are successfully prepared by post-treating the spray-dried precursor powders. Dextrin, which is used as the carbon source material, plays a key role in the preparation of the composite powders with regular morphologies; the bare MnS and MnO powders prepared from the spray solution without dextrin have irregular morphologies. The MnS-C composite powders prepared from the spray solution containing 17 g L-1 of dextrin have mixed crystal structures of α- and γ-MnS phases. These powders exhibit superior electrochemical properties compared with those of their MnS and MnO-C counterparts. For example, at a current density of 0.5 A g-1, the MnO-C powders have a 100th-cycle discharge capacity of 321 mA h g-1; the corresponding discharge capacities of the MnS powders prepared from spray solutions containing 0, 17, and 50 g L-1 of dextrin are 501, 786, and 636 mA h g-1, respectively.
Original language | English |
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Article number | 21426 |
Pages (from-to) | 9-15 |
Number of pages | 7 |
Journal | Journal of Power Sources |
Volume | 295 |
DOIs | |
Publication status | Published - 2015 Jul 8 |
Keywords
- Carbon composite
- Energy conversion
- Energy storage materials
- Manganese sulfide
- Spray drying
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering