I am sorry to ask a naive question or perhaps it is due to my misunderstanding. But I have read that fluoroethylene carbonate is used to suppress electrolyte decomposition. I am wondering why electrolyte decomposition needs to be suppressed?
Do we need the ions of the electrolyte to be stored?
Although the exact reasoning depends mostly on the particular application (e.g. in battery technology or in electrochemical analysis), electrolyte decomposition is never beneficial. Not only will a decomposing electrolyte bring the risk of gas buildup (depending on the electrolyte and decomposition reaction), but we will also see a loss of conductivity in the system and possibly poisoning of the system with non-gaseous electrolyte decomposition products.
Dear Thomasz Jarosz,
Thank you very much for your answer!
My concern is for energy storage device (batteries and supercapacitors). Your answer actually ignited another question. So, for example if I have an aqueous electrolytes, and if the electrolyte decomposition takes place, gas generation will be occurred. If the gas is in the form of H2 and O2, then the O2 will possibly lead to electrode corrosion, so that it is unexpected. Am I right if I think so? What are other possible consequences out of corrosion?
Best,
Efi
While gas buildup may lead to corrosion, it can also lead to the bursting of your battery (assuming it is tightly sealed), if the pressure becomes sufficiently high.
Frankly, I wouldn't worry too much about corrosion due to reactions with the produced O2, but rather about the possibility of the stored charge being discharged in various side reactions.
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