I agree. I've only high school electrochemistry to draw on, but questioning this sort of thing becomes much easier if we focus on the exact claim: * When reduc

I agree. I've only high school electrochemistry to draw on, but questioning this sort of thing becomes much easier if we focus on the exact claim: * When reduced, ethylene carbonate forms a dense material that lithium cations can pass through but solvent molecules can't. * Propylene carbonate does not form this/similar material. * Using propylene carbonate therefore allows the solvent to come into contact with and weaken the graphite anode. * Nobody knows the chemical process that forms the material for ethylene carbonate but does not for propylene carbonate.