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I'm not sure if you're being sarcastic, suggesting that the oil companies would want to keep this from happening. If so, you might want to know that Exxon invented the thin-film-polymer that is now being used between the cells of Li-Ion batteries, which allowed those batteries to be reduced in size by about half. They're interested in advancing battery technology, not squashing it. If they were to buy this patent, it would be because they were interested in producing the material.