Abstract
Sodium-ion batteries (SIBs) have great potential for large-scale energy storage, whereas the development of satisfactory anode material is still a challenge. Herein, the nitrogen-doped carbon encapsulated FeSe2 (FeSe2@NC) with spindle-like nanostructures are proposed by polymerization, carbonization and selenization strategies. The N-doped carbon layer effectively improves the electronic conductivity, provides more activity sites, and alleviates the volume expansion. As expected, the prepared FeSe2@NC delivers excellent rate performance (232.3 mAhg−1 at 1.0 Ag−1) and superior cycle stability (269.8 mAhg−1 after 500 cycles). Significantly, this work proposes an effective material engineering approach for designing transition metal selenides for high-performance SIBs.
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