Fat-soluble Vitamin K2 as a Bio-Safe Electrode Material for Aqueous Zinc-ion Batteries
발표자
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초록
내용
Vitamin-derived molecules, including riboflavin and small quinone derivatives, are drawing much attention as a promising electrode material for bio-safe batteries, due to their high redox activity and safety. However, their electrochemical performance is still impractical due to high solubility in the aqueous condition. Here, we present a simple yet compelling concept to circumvent this issue, proposing the use of fat-soluble Vitamin K2 as a cathode material to realize bio-safe batteries. Notably, the Vitamin K2 electrode exhibited capacity retention of 70 % after 100 charge/discharge cycles in an aqueous zinc-ion battery, which was considerably improved compared to the water-soluble Vitamin B2 electrode. Furthermore, it also showed outstanding rate capability. Even at a high rate of 5C, it could retain 75% of the capacity delivered at 0.1C-rate. Finally, we validate our concept by presenting cell viability test results, which affirm the bio-safety of the proposed electrode components.