Chitosan‐Tethered Iron Oxide Composites as an Antisintering Porous Structure for High‐Performance Li‐Ion Battery Anodes. Issue 8 (3rd May 2016)

• Record Type: Journal Article
• Authors: Nguyen, Thuy‐An; Kim, Il Tae; Lee, Sang‐Wha
• Editors: Vyas, B.
• Is Part Of: Journal of the American Ceramic Society. Volume 99:Issue 8(2016)
• Page Start: 2720
• Page End: 2728
• Publication Date: 2016-05-03
• Subjects: Fe3O4 -- iron oxides -- chitosan composites -- porous structure -- Li‐ion battery; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.14286
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract : Chitosan‐linked Fe3 O4 (CL‐Fe3 O4 ) is facilely prepared by electrostatic interactions between citrate‐capped Fe3 O4 (C‐Fe3 O4 ) (with negatively charged carboxylate groups) and chitosan oligosaccharide lactate (with positively charged amine groups), and utilized as anodes for lithium‐ion batteries. Inert‐atmosphere calcination of CL‐Fe3 O4 at 400°C leads to the formation of chitosan‐tethered iron oxide composites (Fe2 O3 @chitosan) with an antisintering porous structure. As the calcination temperature changes from 400°C to 700°C, the size of primary particles increases from ca. 40 nm to ca. 100 nm, and the surface area decreases from 57.8 m 2 /g to 10.9 m 2 /g. The iron oxide composites exhibit a high discharge capacity and good rate performance. At a current density of 0.1 C after 50 cycles, Fe2 O3 @chitosan (400°C) exhibits a higher retention capacity of 732 mAh/g than those (544 and 634 mAh/g) of chitosan‐free Fe2 O3 and Fe2 O3 @chitosan (700°C), respectively. The high performance of Fe2 O3 @chitosan (400°C) is attributed to the antisintering porous structure with high surface area that is beneficial for facilitating ion transport, demonstrating a useful chemical strategy for the direct formation of porous electrode materials at low calcination temperature.