Preparation And Storage Properties Of TiO₂/RGO Anode Materials For Sodium-ion Batteries

Sodium and lithium are cognate elements and exhibits similar chemical properties to lithium.Compared to lithium ion batteries,Sodium ion batteries have some significant advantages in large-scale energy storage field,because of the huge availability and the low price.As a promising anode materials for the sodium ion battery,titanium dioxide(TiO2)has good cycle stability,but low the conductivity;The combination of graphene and TiO2 can obviously improve the conductivity of electrode materials.In this paper,natural flake graphite and tetrabutyl titanat was used as the research object,the TiO2/RGO composite was prepared by thermal reduction method and hydrothermal method respectively,the structure and properties of sodium storage and its mechanism were studied.The main results are as follows:The electrochemical properties of the 15 wt.%TiO2/RGO composites is the best,which the acceleration rate of butyl titanate drops was 1.0 mL/min and the thermal reduction temperature was 500?.Electrochemical test showed initial discharge capacity of 140.1 mAh· g-1 at the 20 mA ·g-1,and the discharge capacity was 150.2 mAh·g-1 after 50 cycles.At a current density of 60 mA·g-1,the reversible capacity was 107.3 mAh· g-1,with good rate performance.The electrochemical properties of 10 wt.%TiO2/RGO composites prepared by hydrothermal temperature of 140? is the best.Electrochemical test showed initial discharge capacity of 153.8 mAh·g-1 at the 20 mA ·g-1,and the discharge capacity was 143.5 mAh·g-1after 50 cycles.At a current density of 60 mA·g-1,the reversible capacity was 87.7 mAh·g-1.The rate performance is worse than that of TiO2/RGO prepared by thermal reduction method.It may be because the RGO prepared by hydrothermal reduction is not complete and the conductivity is poor.