I made a Lithium sulfur cell, with Sulfur/Carbon cathode and Lithium metal anode using 100 uL of electrolyte (0.6 M LiNO3 and 0.4 M LiTFSI in DME:DOL). I am using a Biologic VSP 300 battery cycler in a galvanostatic (constant current) mode to cycle my battery.
However, when i discharge my LiS cell (Voltage range 2.8 to 1.8), the voltage drops sharply to 0.1 or -0.1V in the first cycle and stabilize at this potential.
Some Observations
1. Disassembling of the cell reveals corrosion of aluminium current collector which is an indication of lithium alloying/platting of aluminium below 0.01V.
2. The experiment has been performed twice on the same channel with same results
3. The OCV profile is also a bit noisy compare to OCV observed in other channels.
4. Similar cells cycled in other channels do not show this behavior.
I would like to ask whether its a problem in the channel? Or Something else. If Yes, would you suggest a way to fix the channels?
Dear
this paper can help you
https://pubs.rsc.org/en/content/articlelanding/2015/ee/c5ee01388g
Thanks AbdelKade, I have read this review some years ago. I think it does not discuss the question i asked. However, If i have missed something in this review, please do inform me.
Sounds like a faulty channel, or simply a short circuit in the cell (it could be a number of issues). I'd repeat the experiment with a different chemistry (e.g. NMC) and also get in touch with BioLogic to have your equipment tested.
Dear Umair Gulzar,
among metals, Li/Al-current collector, try to insert a Cu-foil[1], in a next cell(s), to be: Li/Cu/Al[2].
This way, you will avoid the corrosion of the Al-metal[3] (current collector[4]).
1. A 'thin' (about to 100 um) Cu-foil.
2. Upon the building/forming phase of your next cell(s).
3. Not very pure Al-metal, current collector, corrodes well above 0.01V.
4. If the Al-current collector remains 'dry', e.g. electrolyte free.
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