Flake-like oxygen-deficient lithium vanadium oxides as a high ionic and electronic conductive cathode material for high-power Li-ion battery

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2018-06, Vol.124 (6), p.1-8, Article 450
• Main Authors: Li, Jing-quan, Han, Chong, Jing, Mao-xiang, Yang, Hua, Shen, Xiang-qian, Qin, Shi-biao
• Format: Article
• Language: English
• Subjects: Applied physics; Cathodes; Characterization and Evaluation of Materials; Condensed Matter Physics; Electrochemical analysis; Electrode materials; Electrodes; Flakes; Ion currents; Lithium; Lithium-ion batteries; Machines; Manufacturing; Materials science; Nanotechnology; Optical and Electronic Materials; Oxygen; Physics; Physics and Astronomy; Processes; Stability; Surfaces and Interfaces; Thin Films; Vanadium oxides
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-018-1863-3

Low electronic and ionic conductivity for LiV 3 O 8 cathode material could lead to poor cycling stability and rate capability, which are considered as the main restraint for its application in Li-ion battery. A novel flake-like LiV 3 O 7.9 material modified by high ionic and electronic conductive Li 0.3 V 2 O 5 /C was fabricated via electrospinning and controlled thermal sintering processes. This oxygen-deficient LiV 3 O 7.9 /Li 0.3 V 2 O 5 -C composite electrode sintered at 500 °C exhibits improved rate and cycle stability. The electrode possesses a retention capacity of 151.9mAh/g after 500 cycles at 5C and 84.8mAh/g after 1000 cycles at 10C, respectively. The improvement of the electrochemical performance could be attributed to the synergistic effects of flake-like morphology, oxygen-deficiency and surface modification of Li 0.3 V 2 O 5 /C, which increase the ionic and electronic conductivity of LiV 3 O 8 .