Electrochemical properties of nonstoichiometric silicon suboxide anode materials with controlled oxygen concentration. (1st October 2019)

• Record Type: Journal Article
• Authors: Lee, Jaewoo; Han, Sang A; Lee, Sang-Min; Park, Min-Sik; Kim, Jung Ho
• Is Part Of: Composites. Number 174(2019)
• Publication Date: 2019-10-01
• Subjects: Si/SiOx composite -- Nonstoichiometric SiOx -- Anode -- Lithium-ion batteries -- Lithiation mechanism; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2019.107024
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: Among the silicon (Si)-based anode materials, Si/SiO x is likely to be the best candidate for maintaining structural stability while taking advantage of the high capacity of Si as well as the compatible functionality between Si and SiO x . The oxygen content of SiO x is an especially significant factor for obtaining better performance, because it directly affects electrochemical properties such as reversible capacity, structural stability, and electrical conductivity. Herein, we have synthesized SiO x materials with different oxygen contents via magnesiothermic reduction of silica. The theoretical capacities of a series of Si/SiO x samples were estimated by using X-ray photoelectron spectroscopy, and then those results were compared with empirical results. This work paves the way to predicting the electrochemical performances of lithium-ion battery anodes based on oxygen content in the nonstoichiometric Si/SiO x structure. Graphical abstract: Image 1 Highlights: Si/SiOx materials with various oxygen contents via magnesiothermic reduction of silica had been prepared. The theoretical capacities of a series of Si/SiOx samples had been estimated by using X-ray photoelectron spectroscopy. The optimum oxygen content of Si/SiOx material as a lithium-ion battery anode had been proposed.