Cerium vanadate/carbon nanotube hybrid composite nanostructures as a high-performance anode material for lithium-ion batteries

• 作者: D.Narsimulu Ashok Kumar Kakarla Jae Su Yu
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（7）
• 页码范围: 25-32
• 页数: 8页
• 语种: 英文

摘要

The pristine CeVO4 and CeVO4/CNT hybrid composite nanostructured samples were facilely synthesized using a simple silicone oil-bath method.From the X-ray diffraction results,the formation of tetragonal CeVO4 with an additional minor phase of V2O5 was identified.When investigated as an anode material for lithium (Li)-ion batteries,the CeVO4/CNT hybrid composite nanostructure (HCNS) electrode demonstrated improved Li storage performance over the pristine CeVO4.The Li insertion/de-insertion electrochemical reaction with the CeVO4 was analyzed on the basis of cyclic voltammetry study.The cyclic voltammetry analysis revealed that the three-step reduction of V5+ to V3+,V3+ to V2+,and V2+ to V+ processes is involved and among them,only V5+ to V3+ is reversible during the Li-ion insertion into CeVO4.The CeVO4/CNT HCNS electrode exhibited a discharge capacity as high as 443 mA h g-1 (capacity retention of 96.3％) over 200 cycles at 100 mA g-1,whereas the pristine CeVO4 is limited to 138 mA h g-1 (capacity retention of 48％).Even at a high current density of 500 mA g-1,the CeVO4/CNT HCNS electrode delivered an excellent reversible capacity of 586.82 mA h g-1 after 1200 cycles,