Pramanik A.Mahapatra P.L.Tromer R.Xu J.Costin G.Li C.Saju S.Alhashim S.Pandey K.Srivastava A.Vajtai R.Galvao D.S.Tiwary C.S.Ajayan P.M.2025-01-132025-01-13202419448244https://dl.bhu.ac.in/ir/handle/123456789/2509Natural ores are abundant, cost-effective, and environmentally friendly. Ultrathin (2D) layers of a naturally abundant van der Waals mineral, Biotite, have been prepared in bulk via exfoliation. We report here that this 2D Biotene material has shown extraordinary Li-Na-ion battery anode properties with ultralong cycling stability. Biotene shows 302 and 141 mAh g-1 first cycle-specific charge capacity for Li- and Na-ion battery applications with ?90% initial Coulombic efficiency. The electrode exhibits significantly extended cycling stability with ?75% capacity retention after 4000 cycles even at higher current densities (500-2000 mA g-1). Further, density functional theory studies show the possible Li intercalation mechanism between the 2D Biotene layers. Our work brings new directions toward designing the next generation of metal-ion battery anodes. � 2024 American Chemical Society.enanode materialsbattery electrodesLi-ion batteryNa-ion batterynatural ore materialstwo-dimensional materialsArticle10.1021/acsami.3c15664