The global shift toward electric vehicles (EVs) is reshaping the future of transportation, emphasizing the need for efficient, safe, and sustainable energy storage solutions. Currently, lithium-ion (Li-ion) batteries dominate the EV industry due to their high energy density, relatively fast charging times, and long cycle life. However, high costs, environmental impacts, and supply chain concerns related to lithium-ion batteries have spurred the search for alternatives. Sodium-ion (Na-ion) batteries present a promising option, offering a more abundant and less costly material—sodium—while maintaining comparable performance. This paper provides a comparative analysis of sodium-ion and lithium-ion batteries, assessing parameters such as energy density, cost, environmental impact, safety, and performance in electric vehicle applications. This evaluation highlights the opportunities and limitations of sodium-ion technology and discusses the challenges and future development pathways for its integration in the EV market.