3D hierarchical AlV3O9 microspheres: First synthesis, excellent lithium ion cathode properties, and investigation of electrochemical mechanism. (July 2015)

• Record Type: Journal Article
• Authors: Yang, Gongzheng; Song, Huawei; Yang, Guowei; Wu, Mingmei; Wang, Chengxin
• Is Part Of: Nano energy. Volume 15(2015:Jul.)
• Page Start: 281
• Page End: 292
• Publication Date: 2015-07
• Subjects: Hierarchical AlV3O9 -- Lithium ion cathode materials -- Electrochemical mechanism; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2015.04.038
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Despite considered as promising lithium ion cathode materials, the practical applications of vanadium oxide and its derivatives still suffer from the poor kinetics linked to the low electronic conductivity and slow lithium ion diffusion upon cycling. Engineering three-dimensional (3D) architectures assembled from low-dimensional nanostructures has recently been of particular interests and proved an effective approach to enhance the electrochemical performances since the high surface area and intrinsic structural stability. Herein, we demonstrate the successful preparation of vanadium-based microspheres via a facile one-pot hydrothermal method. After the post-calcining in air, 3D hierarchical AlV3 O9 nanostructures constructed from the assembly of ultrathin nanosheets were successfully obtained . When employed as lithium ion cathodes, the as-synthesized products exhibit outstanding reversible capacity (264 mA h g −1 retained after 100 cycles) and excellent rate performance (145 mA h g −1 at a high current density of 5 A g −1 ) for lithium storage. The superior electrochemical performances of the AlV3 O9 microspheres can be ascribed to the unique 3D hierarchical morphologies with the ultrathin nanosheets building blocks. Graphical abstract: Highlights: We report on the first synthesis of 3D hierarchical AlV3 O9 nanostructures. The hierarchical nanostructures exhibit superior rate performance as lithium cathode materials. The unique architectures and inclusion of Al 3+ lead to the excellent Li-storage performances.