Ultrathin Na1.1V3O7.9 nanobelts with superior performance as cathode materials for lithium-ion batteries.
The Na1.1V3O7.9 nanobelts have been synthesized by a facile and scalable hydrothermal reaction with subsequent calcinations. The morphologies and the crystallinity of the nanobelts are largely determined by the calcination temperatures. Ultrathin nanobelts with a thickness around 20 nm can be obtained, and the TEM reveals that the nanobelts are composed of many stacked thinner belts. When evaluated as a cathode material for lithium batteries, the Na1.1V3O7.9 nanobelts exhibit high specific capacity, good rate capability, and superior long-term cyclic stability. A high specific capacity of 204 mA h g(-1) can be delivered at the current density of 100 mA g(-1). It shows excellent capacity retention of 95% after 200 cycles at the current density of 1500 mA g(-1). As demonstrated by the ex situ XRD results, the Na1.1V3O7.9 nanobelts have very good structural stability upon cycling. The superior electrochemical performances can be attributed to the ultra-thin nanobelts and the good structural stability of the Na1.1V3O7.9 nanobelts.
School of Material Science and Engineering, Central South University , Changsha 410083, Hunan, China.
Shuquan
S
Liang
Jiang
J
Zhou
Guozhao
G
Fang
Jing
J
Liu
Yan
Y
Tang
Xilin
X
Li
Anqiang
A
Pan
D011211:Electric Power Supplies; D055664:Electrochemical Techniques; D004566:Electrodes; D007477:Ions / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D013696:Temperature; D017968:Vanadium Compounds / Q000737:chemistry*
D007477:Ions; D010087:Oxides; D017968:Vanadium Compounds; D008094:Lithium