Ultrastable Orthorhombic Na₂TiSiO₅ Anode for Lithium‐Ion Battery

Abstract Lithium‐ion batteries (LIBs) play an important role in the storage of electrical energy in modern society, and there is an urgent need to develop anode materials that can meet the ever‐increasing demand for high energy density. The use of titanosilicate anode materials in high‐performance LIBs has attracted great attention due to their proper potential between graphite and Li₄Ti₅O₁₂. A novel anode material prepared by an electrospinning method, orthorhombic Na₂TiSiO₅ (O‐NTSO) shows excellent cycle stability (capacity retention after 1000 cycles is 97.8%) and a usable reversible capacity (230 mAh g⁻¹ at 50 mA g⁻¹) with a safe average storage voltage of 0.8 V. The specific capacity of O‐NTSO is constituted by both capacitive and diffusion behavior. As a new member of the silicate anode materials, this orthorhombic Na₂TiSiO₅ has excellent electrochemical performance and is a promising LIB anode material with long cycle stability.