The P2-type NaCoO2 cathode material was prepared by a sol–gel technique, and citric acid was used as a chelating agent. Stoichiometric amounts of sodium acetate (NaCH3COO) and cobalt acetate (Co(CH3COO)2.4H2O) were mixed together and homogenized by stirring for 3 h. Then, PVA was added to the homogenized metal nitrate solution and was allowed to concentrate the process by vigorous stirring at 80 °C for 6 h. An excess of 20% of the sodium precursor was taken along with the stoichiometric amount, in order to compensate for the Na+ ion loss during the high-temperature calcination process. At the end, the obtained gel precursor was dried at 120 °C for 24 h and calcined at different temperatures (700–850 °C), yielding the product of the P2-type NaCoO2 material.
How to decide stoichiometrical amount exactly?
I want ratio between Na content and Co content in the end product NaCoO2 to be in between 0.7 and 1.00
And how much PVA i am supposed to add to form a gel after strring
Harshith Venkat V
Without additives in your system, there is a reaction
2Na+ +H2CoO2 = Na2CoO2 =Na2CoO2 + 2H+
Therefore, you need to take the ratio of precursors
2 mol CH3COONa and 1 mol Co(CH3COO)2. Therefore, you must take more than 1 mole of Co(CH3COO)2.4H2O based on its water content.
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science