One of the main reasons for the high price of lithium and low price of aluminum is their abundance in Earth's crust. Aluminum is the third most abundant element after oxygen and silicon. Lithium metal only makes up about 0.002% of Earth's crust by mass while aluminum makes up nearly 8% of Earth's crust . This massive difference shows how rare lithium reserves are on Earth and further demonstrates that it is not a sustainable solution. Using a more abundant material could lead to a more stable and potentially lower-cost supply chain from miner to manufacturer to consumer. Furthermore, the well-established extraction processes could make aluminum-ion batteries more cost-effective than lithium-ion batteries as these systems have been refined over the centuries to make aluminum mining exceptionally efficient.