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There really isn’t that much lithium in today’s “Lithium ion” batteries. A few percent by weight. Much more Nickel, Cobalt, Aluminum, Carbon, Copper, and Iron than Lithium. Lithium metal anodes would push that number up but that flavor hasn’t really solved it’s lifespan problems yet.

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Stating there isn't much lithium in a single cell isn't really meaningful; there are a lot of individual batteries, and the number keeps growing, so we still require a lot of lithium to be mined. Relatively less than other minerals, but still a significant amount and still destructive to the local area where lithium is mined.

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