Engineering flexible carbon nanofiber concatenated MOF-derived hollow octahedral CoFe2O4 as an anode material for enhanced lithium storage. Issue 13 (11th June 2021)

• Record Type: Journal Article
• Authors: Xue, Fangfang; Li, Yangyang; Liu, Chen; Zhang, Zhigang; Lin, Jun; Hao, Junyang; Li, Qiuhong
• Is Part Of: Inorganic chemistry frontiers. Volume 8:Issue 13(2021)
• Page Start: 3363
• Page End: 3370
• Publication Date: 2021-06-11
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1qi00414j
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : We constructed a necklace-like structure consisting of hollow CoFe2 O4 octahedral nanoparticles encapsulated in N-doped carbon nanofibers (CoFe2 O4 @CNFs), which deliver an excellent electrochemical performance as free-standing anodes for LIBs. Abstract : Constructing suitable electrode materials with high capacity and excellent mechanical properties is indispensable for flexible lithium-ion batteries (LIBs) to satisfy the growing requirements of flexible and wearable electronic devices. Herein, a necklace-like architecture of metal–organic framework (MOF)-derived hollow octahedral CoFe2 O4 confined into electrospun one-dimensional N-doped carbon nanofibers (CoFe2 O4 @CNFs) is successfully developed. The hollow structure not only provides space to accommodate the volumetric expansion of the CoFe2 O4 nanoparticles, but also shortens the Li + diffusion length. Furthermore, the CNF-supported three-dimensional conductive framework can effectively prevent CoFe2 O4 particle agglomeration and pulverization for enhanced structural stability, and meanwhile promote the diffusion of electrons in all directions, thus enhancing the reaction kinetics. Owing to the unique structure characteristics, the free-standing CoFe2 O4 @CNF anode for LIBs exhibits a reversible capacity of 1230 mA h g −1 at 0.1 A g −1 and superior cycling stability (735.1 mA h g −1 at 0.5 A g −1 over more than 500 cycles). Interestingly, the CoFe2 O4 @CNF films also exhibit impressive mechanical performance and remarkable flexibility, demonstrating their great potential for application in flexible energy storage devices.