Synthesis of Iron Sulfide Nanocrystals Encapsulated in Highly Porous Carbon ‐Coated CNT Microsphere as Anode Materials for Sodium‐Ion Batteries

In this study, a concept of highly porous carbon-coated carbon nanotube (CNT) porous microspheres, which serve as excellent reservoir materials is suggested and a porous microsphere is developed by encapsulating iron sulfide nanocrystals within the highly porous carbon-coated CNTs using a sulfidation process. Furthermore, various sulfidation processes to determine the optimal method for achieving complete encapsulation are investigated by comparing the morphologies of diverse iron sulfide-carbon composites. The fully encapsulated structure, combined with the porous carbon, provides ample space to accommodate the significant volume changes during cycling. As a result, the porous iron sulfide-carbon-CNT composite microspheres exhibited outstanding cycling stability (293  mA h g−1 over 600 cycles at 1 A g−1) and remarkable rate capability (100  mA h g−1 at 5 A g−1).

Source: Small - September 20, 2023 Category: Nanotechnology Authors: Yeong Beom Kim, Hyo Yeong Seo, Kyeong ‐Ho Kim, Jung Sang Cho, Yun Chan Kang, Gi Dae Park Tags: Research Article Source Type: research