Titanium dioxide (TiO_(2)) has been widely investigated as a candidate for anode materials of sodium-ion batteries (SIBs) due to its low cost and high abundance.However,the intrinsic sluggish ion/electron transfer rat...Titanium dioxide (TiO_(2)) has been widely investigated as a candidate for anode materials of sodium-ion batteries (SIBs) due to its low cost and high abundance.However,the intrinsic sluggish ion/electron transfer rate hinders its practical applications for high energy density storage devices.In contrast,antimony(Sb) shows high specific theoretical capacity (660 m Ah/g) as well as excellent electron conductivity,but the large volume variation upon cycling usually leads to severe capacity fading.Herein,with the objective of achieving high-performance sodium storage anode materials,Ti O_(2)@C-Sb nanotablets with a small amount of Sb content (6.4 wt%) are developed through calcination Ti-metal–organic framework (MIL-125)derived TiO_(2)@C/SbCl3 mixture under reductive atmosphere.Benefitting from the synergetic effect of welldispersed Sb nanoparticles as well as robust porous TiO_(2)@C substrate,the TiO_(2)@C-Sb shows enhanced electron/ion transfer rate and predominantly pseudocapacitive sodium storage behavior,delivering a reversible capacity of 219 m Ah/g at 0.5 A/g even after 1000 cycles.More significantly,this method may be commonly used to incorporate other alloy-based high-theoretical materials into MIL-125-derived TiO_(2)@C,which is promising for developing high-energy-density TiO_(2)-based energy storage devices.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52077175,51905236)the State Key Laboratory of Electrical Insulation and Power Equipment(No.EIPE22204)+1 种基金the Natural Science Research Project of Higher Education Institutions in Jiangsu Province(No.20KJA480005)the Qinglan Engineering Project of Jiangsu Universities。
文摘Titanium dioxide (TiO_(2)) has been widely investigated as a candidate for anode materials of sodium-ion batteries (SIBs) due to its low cost and high abundance.However,the intrinsic sluggish ion/electron transfer rate hinders its practical applications for high energy density storage devices.In contrast,antimony(Sb) shows high specific theoretical capacity (660 m Ah/g) as well as excellent electron conductivity,but the large volume variation upon cycling usually leads to severe capacity fading.Herein,with the objective of achieving high-performance sodium storage anode materials,Ti O_(2)@C-Sb nanotablets with a small amount of Sb content (6.4 wt%) are developed through calcination Ti-metal–organic framework (MIL-125)derived TiO_(2)@C/SbCl3 mixture under reductive atmosphere.Benefitting from the synergetic effect of welldispersed Sb nanoparticles as well as robust porous TiO_(2)@C substrate,the TiO_(2)@C-Sb shows enhanced electron/ion transfer rate and predominantly pseudocapacitive sodium storage behavior,delivering a reversible capacity of 219 m Ah/g at 0.5 A/g even after 1000 cycles.More significantly,this method may be commonly used to incorporate other alloy-based high-theoretical materials into MIL-125-derived TiO_(2)@C,which is promising for developing high-energy-density TiO_(2)-based energy storage devices.
