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Li-Ion fire safety, inert atmosphere (discuss.tchncs.de)

submitted 1 month ago* (last edited 1 month ago) by Rolive@discuss.tchncs.de to c/diy@slrpnk.net

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This is an idea that entered my mind. As far as I understood lithium ion batteries still need oxygen from the air to burn.

They don't provide their own oxidizer IIRC but they do reignite when left to dry because they rapidly build up heat again. Please correct me if I'm wrong.

Edit: I was wrong: https://www.sciencedirect.com/science/article/pii/S2352152X24008739

The cathode breaks down into oxygen among other things.

Would it make sense to have a lithium ion battery inside an airtight enclosure and fill it up with nitrogen? This way the only source of oxygen is from the decomposing cathode but that should react away quickly. The fire will be much less intense than in regular air. Assuming the enclosure holds.

Is this a silly idea? Is it even worth doing?

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[–] perestroika@slrpnk.net 1 points 1 month ago* (last edited 1 month ago)

Most likely, it could help slow the process (buy time for firefighters to arrive) in some percentage of cases where a cell's surface has been mechanically punctured.

Provided large amounts of nitrogen and an already empty battery (devoid of chemical energy), in a small percentage of cases, it might prevent a fire.

However, having seen a lithium polymer cell heat up from mechanical damage (a drone crash), I can confidently tell that very high temperatures can be achieved without oxygen. They'll just be even higher with it.