Scalable synthesis of one-dimensional Na2Li2Ti6O14 nanofibers as ultrahigh rate capability anodes for lithium-ion batteries

Abstract

Carbon anode materials for Li-ion batteries have been operated close to their theoretical rate and cycle limits. Therefore, titanium-based materials have attracted great attention due to their high stability. Here, Na₂Li₂Ti₆O₁₄ nanofibers as anode materials were prepared through a controlled electrospinning method. The Na₂Li₂Ti₆O₁₄ nanofibers presented superior electrochemical performance with high rate capability and long cycle life and can be regarded as a competitive anode candidate for advanced Li-ion batteries. One-dimensional (1D) Na₂Li₂Ti₆O₁₄ nanofibers are able to deliver a capacity of 128.5 mA h g⁻¹ at 0.5C, and demonstrate superior high-rate charge–discharge capability and cycling stability (the reversible charge capacity is 77.8 mA h g⁻¹ with a capacity retention of 99.45% at the rate of 10C after 800 cycles). The 1D structure is considered to contribute remarkably to increased rate capability and stability. This simple and scalable method indicates that the Na₂Li₂Ti₆O₁₄ nanofibers have a practical application potential for high performance lithium-ion batteries.