In several papers, on carbon coated cathode materials the ratio of Super P: PVDF: Active material is taken as 1:1:8.
So, during calculation of the actual active material (say carbon coating is 5 wt%) should we subtract this, which would lead to around 76% net active material instead of the total 80%. (This essentially would lead to around 5.3% increase in specific capacity value!)
or,
should we simply consider the carbon coating as part of active material?
What should be the practical approach?
you can see the following links:
1. Article Synergistic effect of sulfur on electrochemical performances...
2. https://www.sciencedirect.com/science/article/abs/pii/S037877530802380X
3. https://www.sciencedirect.com/science/article/abs/pii/S0378775305004519
Hi Rajeev,
I would consider the carbon coating as part of the active material as the ion will intercalate into it. In Si-based batteries as an example, this carbon coating will highly influence the practical capacity as there are 2 mechanisms: intercalation into carbon and alloying of Lithium silicate. In this sense, the same calculation should be taken into account when working with positive electrodes.
In the case of the anode material (Voltage range 0 - 2 V), here you need to consider the carbon coating as the part of active material or you need to check capacity contribution from conductive carbon alone and subtract capacity contribution but in the case of the cathode material where the working voltage is more than 2-2-5 to 4.5 V, here you need to consider only active material weight for capacity calculation.
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