Electrochemical properties of MnS–C and MnO–C composite powders prepared via spray drying process

• Published in: Journal of power sources 2015-11, Vol.295, p.9-15
• Main Authors: Jeon, Kyung Min, Cho, Jung Sang, Kang, Yun Chan
• Format: Article
• Language: English
• Subjects: Carbon composite; Energy conversion; Energy storage materials; Manganese sulfide; Spray drying
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2015.06.142

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. [Display omitted] •Spherical MnS–C and MnO–C composite powders are prepared by spray drying process.•Dextrin plays a key role in the preparation of MnS–C and MnO–C composite powders.•MnS–C powders exhibit good electrochemical properties for lithium-ion storage.