Employment of Chitosan–linked Iron Oxides as Mesoporous Anode Materials for Improved Lithium–ion Batteries. (10th July 2015)

• Record Type: Journal Article
• Authors: Kim, Kun–Woo; Kim, Jung Sub; Lee, Sang–Wha; Lee, Joong Kee
• Is Part Of: Electrochimica acta. Volume 170(2015)
• Page Start: 146
• Page End: 153
• Publication Date: 2015-07-10
• Subjects: Iron oxides -- Li–ion battery -- Chitosan -- Mesoporous; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.04.132
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: This study investigates the concentration effect of chitosan on the formation of iron oxide composites and their electrochemical performance as anode materials in Li–ion batteries. The molecular bridging effect of chitosan chains induces the clustered aggregation of citrate–capped Fe3 O4 (C–Fe3 O4 ) through the electrostatic interactions between carboxylate groups of C–Fe3 O4 and amine groups of chitosan. The thermal calcination of chitosan–linked Fe3 O4 leads to carbon–coated Fe2 O3 (Fe2 O3 @carbon) with the mesopore range of porosity (20–30 nm). The mesoporous Fe2 O3 @carbon exhibits an improved electrochemical performance as anode materials in Li–ion batteries. The capacity retention of Fe2 O3 @carbon is twice that of bare Fe2 O3 after the 50th cycle at 0.1 C. During the charge–discharge process, the Fe2 O3 @carbon (3 ml of chitosan) exhibits the highest retention capacity among as–prepared samples, whereas Fe2 O3 @carbon (1 ml of chitosan) exhibits the lowest retention capacity owing to the weakly cross–linked iron oxides. The improved performance of Fe2 O3 @carbon as anode materials is mainly attributed to the optimal cross–linking effect and structural integrity of mesoporous composite which is beneficial for the effective transport of electrolytes and/or Li–ons, suggesting a useful guideline for preparing porous electrode materials using metal oxide particles.