In context I think that they're referring to the long run cost effectiveness compared to other batteries, for instance NiMH, or maybe even PbC, depending on the application. In other words, if we eventually need Lithium from much more expensive sources, maybe even sea water, and the increase in extraction pushes LFPs enough above
NiMH at ~$200-300/kWhin mass production, then it may not be cost effective for PHEVs/EVs.
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Current proven world reserves should be sufficient for the hybrid electric vehicle market, although plug-in hybrid electric vehicle and electric vehicle expansion would put considerable strain on resources and hence cost effectiveness.
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That said, either way we cut it, it appears that we'll have some form of durable (100k+ miles at 80-90% capacity/range), cost effective battery for EVs. Given how little Lithium is used in LFPs, I think we'll stick with those once the patent isht gets resolved, but if other applications (LCDs?) push prices up we may end up with NiMH, which is still good enough in mass production.