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> The flavour you want is polymer, single ion conducting solid state with an ion transport activation energy below 10kJ/mol at room temperature and no phase transitions from -40C to 80C.

what makes it so? I don't know anything about this subject, I'm really curious now about what the perfect battery would be.

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No idea why polymer single ion conducting would stop dendrites (I know people are looking for it, I don't know why).

But 10kJ/mol of activation energy is another way of saying less than 100mV of internal loses, and avoiding phase transitions means that your battery won't stop working on that temperature range.

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