Abstract: A prelithiated negative electrode, and a secondary battery including a prelithiated electrode, including a negative electrode current collector; and a negative electrode active material layer present on at least one surface of the negative electrode current collector. The negative electrode active material layer includes high-capacity artificial graphite having no carbon coating. The negative electrode active material layer is prelithiated, and the content of lithium intercalated to the prelithiated negative electrode active material layer is 3% to 5% based on the lithium content intercalated when the negative electrode is charged to 100%.

Abstract: There is provided a method of preparing a fluorescent silk fibroin solution, which includes a) obtaining scoured fluorescent silk fibroin by adding transgenic fluorescent silkworm cocoons to an aqueous solution including a scouring agent, heating the transgenic fluorescent silkworm cocoons at 40 to 60° C. for 8 to 24 hours and washing the transgenic fluorescent silkworm cocoons with distilled water, b) dissolving the scoured fluorescent silk fibroin at 40 to 60° C. for 1 to 5 hours in a solvent in which 15 mg to 1.5 g of dithiothreitol (DTT) is mixed per 100 mL of 9 to 9.6 M LiBr, and c) dialyzing the dissolved fluorescent silk fibroin in single distilled water for 48 to 96 hours. The scouring agent includes an alcalase and sodium hydrogen carbonate (NaHCO3). The conventional methods of preparing a silk fibroin solution from fluorescent silkworm cocoons have drawbacks in that silk fibroin is not dissolved at a low temperature and fluorescence is lost.