I have noticed that multi-layered thin films have been adopted as cathode/anode materials in lithium ion battery. The porous structure is superior in raising power of the battery. Then why would condensed material still being adopted?
If by condensed you mean thin or ultra-thin materials, then this is important for promoting a high energy density. Specific energy is usually stated in units of W·h/kg therefore, bulky components reduce specific energy due to the internal resistance of these components on the transfer of electrons and ions.
What do you mean condensed material?
Is it multi-layered film? If yes, then we need layered type materials for Li-ion battery, used as cathode or anode. Because the mechanism reflects that Li-ion goes in between the layers while discharging and come out while charging. And the capacity of the battery depends how many Li ions intercalate in to the layers.
Porous type materials are being used as supercapacitor studies than a battery material.
Dr. Padbury, thank you for the reply. Indeed, the condensed material is absolutely favorites the total resistance and otherwise improve the energy density of the of the battery. One of the current developments of battery is focused in rasing capacity. The porous structure obviously has a more promise energy storage density, and like you said, the energy is stated in units of W h/kg or mA h/g. Therefore I think porous structure is obviously a more superior structure?
And Sarkar, yes I do meant the multi-layered structure thin film. I think the porous structure is obviously possessed with much larger surface/volume(mass) ratio. Then what is the point of using multi-films rather than the porous? It will be grateful if you have any BET results/papers regard to the surface ratio comparison between the two structures. Cheers!
As Sujoy states, porous structures are beneficial for capacity due to efficient intercalation, thin structures are good for energy density, I can imagine that multilayer electrodes might be beneficial for capacity retention. During charge and discharge a lot is going on in the cell for example, volume changes occur which can damage the device. A lot of research explores composite electrodes that afford greater stability. Perhaps the multilayer materials you are refering to provide this benefit.
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