Improved electrochemical property of nanoparticle polyoxovanadate K7NiV13O38 as cathode material for lithium battery

• Published in: Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology Vol. 15; no. 6
• Main Authors: Ni, Erfu, Uematsu, Shinya, Quan, Zhen, Sonoyama, Noriyuki
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 2013; Springer
• Subjects: Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Inorganic Chemistry; Lasers; Materials Science; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals; Nanotechnology; Optical Devices; Optics; Photonics; Physical Chemistry; Physics; Research Paper; Structure of solids and liquids; crystallography; Nanoparticles; Polyoxovanadate; Cathode material; Lithium ion battery; Molecular clusters; Crystallization; XRD; Electrode material; Lithium battery; Particle size distribution; Electrochemical properties; Fourier transform spectra; Current density; Nanostructured materials; Acetone; Crystal structure
• ISSN: 1388-0764; 1572-896X
• DOI: 10.1007/s11051-013-1732-0

Molecular cluster ion compound K 7 NiV 13 O 38 (KNiV) has been studied as a novel cathode material for lithium ion battery. The nanoparticles are prepared by a simple re-crystallization method adding different volumes of acetone to the water solution containing the dissolved KNiV. The KNiV re-crystallized from water/acetone ratio of 1:5 shows the most uniform particle size distribution and the smallest particles with thickness of ~100 nm and width of ~150 nm. The nanoparticle KNiV shows significant improvement in initial discharge capacity and capacity retention after 50 cycles compared to the as-prepared micro-sized particles at various current densities. Ex situ XRD patterns demonstrate that the discharge–charge process proceeds with amorphous KNiV, which is independent from the crystal structure. Ex situ FT-IR spectra indicate that [NiV 13 O 38 ] 7− cluster ion is stable and reacts reversibly with lithium ion in the discharge–charge process.