Efficient modification of Si/SiOx nanoparticles by pulse-modulated plasma flash evaporation for an improved capacity of lithium-ion storage. (7th June 2019)

• Record Type: Journal Article
• Authors: Kambara, M; Hamazaki, S; Kodama, N; Tanaka, Y
• Is Part Of: Journal of physics. Volume 52:Number 32(2019)
• Publication Date: 2019-06-07
• Subjects: thermal plasma -- nanoparticles -- lithium-ion battery -- silicon monoxide; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/ab1c9f
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Composite Si/SiO z nanoparticles have been produced from SiO powder feedstock by pulse-modulated plasma flash evaporation (PFE) and the effect on the lithium-ion battery properties are analyzed. With the introduction of power and powder-feeding pulse-modulation during PFE, the primary SiO x particle size decreases from 27.9 to 14.3 nm and the core crystalline Si is reduced from 14.2 to 7.3 nm. Although no appreciable reduction in the overall oxygen content ( x ) in the SiO x representation is confirmed, the composite nanoparticles with amorphous Si core are formed by the modulation due to the disproportionation reaction at lower temperatures. As a result, the coulombic efficiency is improved, and the higher cycle capacities are attained for the battery using the modulated nanoparticles as an anode.