Highly stable sodium storage in 3-D gradational Sb–NiSb–Ni heterostructures. (July 2015)

• Record Type: Journal Article
• Authors: Lee, Chan Woo; Kim, Jae-Chan; Park, Sangbaek; Song, Hee Jo; Kim, Dong-Wan
• Is Part Of: Nano energy. Volume 15(2015:Jul.)
• Page Start: 479
• Page End: 489
• Publication Date: 2015-07
• Subjects: Sodium ion batteries -- Nano-scale alloying -- Gradational heterostructures -- 3-D microbatteries; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2015.05.013
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Active/inactive alloyed systems in battery materials have been shown to relieve the agglomeration of active materials during cycling, thus exhibiting enhanced cyclability. However, the immoderate interaction between active and inactive elements can reduce the capacity of active materials. The present study realized a compositionally gradational heterostructure composed of a Ni core, NiSb interface, and attached Sb crystals via pulsed electrodeposition under controlled conditions. The 3-D Sb/NiSb/Ni electrode showed highly stable cycling performance for sodium storage at the expense of capacity decrease (391 mA h g −1 at a current rate of 66 mA g −1 after 300 cycles). High-resolution transmission electron microscopy analysis of the cycled samples revealed that the reversible solid-state reaction occurs between Sb/NiSb/Ni and Na3 Sb/NaSb/Ni heterostructures during sodiation/desodiation. The cycling stability was attributed to the strong interaction between Ni and Sb. Graphical abstract: Highlights: We realized a compositionally gradational Sb/NiSb/Ni via pulsed electrodeposition. Uniform decoration of Sb can be achieved under the diffusion-controlled condition. The heterostructure shows stable cycling between Sb/NiSb/Ni and Na3 Sb/NaSb/Ni.