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 (391mAhg<sup>-1</sup> at a current rate of 66mAg<sup>-1</sup> 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 Na<inf>3</inf>Sb/NaSb/Ni heterostructures during sodiation/desodiation. The cycling stability was attributed to the strong interaction between Ni and Sb.
| Original language | English |
|---|---|
| Pages (from-to) | 479-489 |
| Number of pages | 11 |
| Journal | Nano Energy |
| Volume | 15 |
| DOIs | |
| Publication status | Published - 2015 Jul 1 |
Keywords
- 3-D microbatteries
- Gradational heterostructures
- Nano-scale alloying
- Sodium ion batteries
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- Electrical and Electronic Engineering