0.6Li2MnO3-0.4Li(Ni1/3Mn1/3Co1/3)O2 composite cathode powders are prepared by spray pyrolysis. The spherical shape of the precursor powders are maintained after post-treatment at temperatures between 600 and 900°C. The grain growth in the powders increases with increasing post-treatment temperatures. The BET surface area of the composite cathode powderspost-treated at 800°C is 7 mg2 g-1. The discharge capacity of the cathode powders post-treated at 800°C decreases from 274 mAh gg-1 to 242 mAh gg-1 by the 50th cycle, the capacity retention being 88.3%. However, the discharge capacity of the powders post-treated at 700°C decreases from 247 mAh g-1 to 201 mAh gg-1 by the 9th cycle. A high amount of Li2MnO2 in composite powders post-treated at high temperatures improves their cycle properties even at a high cutoff voltage of 4.8 V.
|Number of pages||13|
|Journal||International Journal of Electrochemical Science|
|Publication status||Published - 2013 Feb|
- Chemical synthesis
- Composite materials
- Electrochemical properties
ASJC Scopus subject areas