What element gives its name to the rechargeable batteries widely used in phones and laptops?

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Lithium-ion batteries are widely used in phones, laptops, cordless tools and electric vehicles due to their energy density and ability to complete many charge cycles. During operation, lithium ions move between the electrodes through the electrolyte. However, lithium is not the only element used in a rechargeable battery. Lead-acid batteries, used in particular for starting automobiles and stationary storage, can also be recharged. The question must therefore specify portable electronic devices or lithium-ion technology to avoid lead being a second correct answer.