LAUSR

Abstract Benefitting from high abundance and low cost, sodium-ion batteries (NIBs) have been considered as promising energy storage device in large-scale application. However, low cycling stability and poor rate performance originated from the large size and heavy weight of the sodium ions hinder its application. In this work, a green ball dianthus-like sodium titanate (Na 2 Ti 6 O 13 ) with a tunnel structure and large interlayer space has been synthesized via hydrothermal method and its formation mechanism has been investigated. As NIBs anode materials, Na 2 Ti 6 O 13 exhibits excellent rate performance and superior cyclability. A high reversible capacity over 100 mA h g −1 is delivered at 1000 mA g −1 after 300 cycles. Even after 200 cycles at 500 mA g −1 and 200 cycles at 1000 mA g −1 , the electrode can afford a capacity of 66 mA h g −1 at 2000 mA g −1 without apparent decay after 200 cycles. This outstanding performance can attribute to the unique nano-structure and large interlayer space of Na 2 Ti 6 O 13 with a green ball dianthus-like morphology.