Abstract
A strategy for the preparation of metal oxide-carbon composite powders with yolk-shell structure by simple spray pyrolysis is introduced. Mn-Sn-O-C composite powders with yolk-shell structure representing the first target material are prepared by one-pot spray pyrolysis and their formation mechanism is evaluated. Phase separation of polyvinylpyrrolidone (PVP), Sn, and Mn components during the drying stage of droplets plays a key role in the formation of yolk-shell structured composite powders. The repeated combustion and contraction processes of the dried powders under N2 atmosphere produce the desired Mn-Sn-O-C composite powders with yolk-shell structure. The shell and core parts of the yolk-shell powders prepared directly by spray pyrolysis at 900 °C are MnO-Mn2SnO4-C and Sn-Mn2SnO4-C composites, respectively. The initial discharge capacities of the composite powders prepared at 700 and 900 °C at the current density of 1 A g-1 are 1058 and 1204 mA h g-1, respectively. The discharge capacities of the composite powders prepared at 900 °C for the 2nd and 100th cycle are 803 and 784 mA h g-1, respectively. The structural stability of the Mn-Sn-O-C composite powders with yolk-shell structure during cycling results in good electrochemical performance.
Original language | English |
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Pages (from-to) | 137-144 |
Number of pages | 8 |
Journal | Carbon |
Volume | 100 |
DOIs | |
Publication status | Published - 2016 Apr 1 |
Keywords
- Carbon composite
- Lithium ion battery
- Spray pyrolysis
- Yolk-shell
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)