Also what can be the reasons for poor charge capacity followed by a high discharge capacity?
Neha Tewari As long as you are using Li metal in a half a cell, the other electrode is the cathode, as it has a positive potential vs. lithium when you cycle the battery, whatever this electrode is e.g. graphite, LTO, LFP, etc.
If you mean by your question if you should charge or discharge first in your first cycle, depending on the type of the cathode you are using, then I think this depends on the lithiation state of the electrode you are using in the half cell. With LTO, I discharge first but with LFP, NMC, etc, I charge first.
For the poor charge but higher discharge capacity, this looks strange to me. This means your columbic efficiency is >100%. Do you get this for all cycles or only first cycle?
If you build a half cell check the voltage limits for the used material.
It might be that you have additional losses or parasitic side reactions or even ohmic losses. How is your contact?
Mohammed B. Effat Thank you so much. I completely agree with reasoning you gave. But my doubt came from having read certain papers on half cell lithium ion batteries where the electrode was mentioned as an anode. Most of the papers on perovskite electrode based half cell li ion batteries consider it as an anode. Is it because of the functioning it provides? Of storing charge by intercalation?
Neha Tewari Please give me the title of the paper you are referring to. Doyou mean the perovskite is considered anode while Li is cathode? Anode to me is the electrode that has the lowest potential in the cell and the highest capacity of Li so it acts as a reservoir of Li to the other electrode. I doubt perovskite has a potential lower than Li metal, or a specific capacity higher than it. The only reason I can think of if perovskite is named anode in the papers you study from is that, later in a full cell configuration (when perovskite will be used with another electrode), the perovskite will be used as the anode while the other electrode (e.g. NMC) will be the cathode. So, they name perovskite as anode due to its actual role it will play "later" in a full cell assembly. I hope this helps
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