Spherically shaped 0.3Li 2MnO 3·0.7LiNi 0.5Mn 0.5O 2 composite cathode powders with filled morphology and narrow size distribution are prepared by large-scale spray pyrolysis. A droplet classification reduces the standard deviation of the size distribution of the composite cathode powders. Addition of boric acid improves the morphological properties of the product powders by forming a lithium borate glass material with low melting temperature. The optimum amount of boric acid dissolved in the spray solution is 0.8 wt% of the composite powders. The powders prepared from the spray solution with 0.8 wt% boric acid have a mixed layered crystal structure comprising Li 2MnO 3 and LiNi 0.5Mn 0.5O 2 phases, thus forming a composite compound. The initial charge and discharge capacities of the composite cathode powders prepared from the 0.8 wt% boric acid spray solution are 297 and 217 mAh g -1, respectively. The discharge capacity of the powders decreases from 217 to 196 mAh g -1 by the 30th cycle, in which the capacity retention is 90%.
|Number of pages||6|
|Journal||Materials Research Bulletin|
|Publication status||Published - 2012 Dec|
Bibliographical noteFunding Information:
This research was supported by the Converging Research Center Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( 2011-50210 ). This study was also supported by Seoul R&BD Program ( WR090671 ).
- A. Layered compounds
- B. Chemical synthesis
- C. Electrochemical measurements
- D. Energy storage
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering