title: High throughput production of nanocomposite SiOxpowders by plasma spray physical vapor deposition for negative electrode of lithium ion batteries.
abstract: Nanocomposite Si/SiOxpowders were produced by plasma spray physical vapor deposition (PS-PVD) at a material throughput of 480 g h-1. The powders are fundamentally an aggregate of primary ∼20 nm particles, which are composed of a crystalline Si core and SiOxshell structure. This is made possible by complete evaporation of raw SiO powders and subsequent rapid condensation of high temperature SiOxvapors, followed by disproportionation reaction of nucleated SiOxnanoparticles. When CH4was additionally introduced to the PS-PVD, the volume of the core Si increases while reducing potentially the SiOxshell thickness as a result of the enhanced SiO reduction, although an unfavorable SiC phase emerges when the C/Si molar ratio is greater than 1. As a result of the increased amount of Si active material and reduced source for irreversible capacity, half-cell batteries made of PS-PVD powders with C/Si = 0.25 have exhibited improved initial efficiency and maintenance of capacity as high as 1000 mAh g-1after 100 cycles at the same time.
authors.affiliation: Department of Materials Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo, Tokyo, 113-8656, Japan.
authors.forename: Keiichiro
authors.initials: K
authors.lastname: Homma
authors.affiliation: Department of Materials Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo, Tokyo, 113-8656, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Kambara
authors.affiliation: Department of Materials Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo, Tokyo, 113-8656, Japan.
authors.forename: Toyonobu
authors.initials: T
authors.lastname: Yoshida
keywords: Anode; Lithium ion battery; Nanoparticle; Plasma spray; Silicon