Anatase TiO2 micro/nano-spheres with rich oxygen vacancies as a high-performance anode material for sodium-ion batteries

被引:2
作者
Xu, Wenhan [1 ]
Jiang, Li [1 ]
Li, Yanwei [1 ,2 ]
Huang, Qize [2 ]
Yao, Jinhuan [2 ]
Lei, Chenghong [1 ,2 ]
机构
[1] Guilin Univ Technol, Coll Mat Sci & Engn, Key Lab New Proc Technol Nonferrous Met & Mat, Minist Educ, Guilin 541004, Peoples R China
[2] Guilin Univ Technol, Coll Chem & Bioengn, Guangxi Key Lab Electrochem & Magneto Chem Funct M, Guilin 541004, Peoples R China
关键词
Sodium-ion batteries; Anode materials; Titanium dioxide; Electrochemical properties; NANOTUBES; STORAGE; MICROSPHERES; CAPACITY; NITROGEN; CATHODE; TITANIA; LITHIUM;
D O I
10.1016/j.est.2024.112014
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In this work, sea urchin-like micro/nano anatase titanium dioxide (TiO2) spheres are fabricated by a facile hydrothermal method and subsequent heat treatment in N2 atmosphere. Benefiting from the unique micro/nanospheres structure, large specific surface area, and rich oxygen vacancies, this sea urchin-like micro/nano TiO2 spheres exhibit excellent long-cycle stability (204.5 mAh g- 1 after 1000 cycles at 1.0 A g- 1, with a capacity retention rate of 93.3 %) and superior high-rate performance (137.2 mAh g- 1 at 10.0 A g- 1). Even at 10.0 A g- 1 for 20,000 cycles, it still maintains a reversible specific capacity of 120.5 mAh g- 1. CV, EIS and GITT analysis demonstrate that the TiO2 nanospheres exhibit obvious pseudocapacitive behavior, stable reaction kinetics and large Na+ diffusion coefficient during the discharge/charge process. More importantly, the Na-ion full cell assembled with NaVPO4F as a cathode material and TiO2 nanospheres as an anode material also exhibit good cycling stability (142.7 mAh g- 1 after 100 cycles at 0.5 A g- 1).
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页数:9
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