Metal-organic framework derived hierarchical porous TiO2 nanopills as a super stable anode for Na-ion batteries

摘要

Hierarchical porous TiO2 nanopills were synthesized using a titanium metal-organic framework MIL-125(Ti) as precursor.The as-synthesized TiO2 nanopills owned a large specific surface area of 102 m2/g and unique porous structure.Furthermore,the obtained TiO2 nanopills were applied as anode materials for Na-ion batteries for the first time.The as-synthesized TiO2 nanopills achieved a high discharge capacity of 196A mAh/g at a current density of 0.1 A/g.A discharge capacity of 115.9 rnAh/g was obtained at a high current density of 0.5 A/g and the capacity retention was remained as high as 90％ even after 3000 cycles.The excellent electrochemical performance can be attributed to its unique hierarchical porous feature.