1. FeSe2 micro-nanorods confined in N-doped carbon as an advanced anode for fast sodium ion storage.
- Author
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Zhou, Shilin, Jiang, Rui, Wang, Shige, Yu, Lu, Shi, Xiaoyan, Shao, Lianyi, Sun, Zhipeng, and Hang, Lifeng
- Abstract
Metal selenides have aroused significant attention in the realm of efficient ion storage attributed to their exceptional chemical and physical properties, whereas their utilization in sodium-ion batteries (SIBs) is hindered by poor rate performance and cycle stability that originated from their substantial volume expansion throughout Na
+ insertion/extraction procedures. This work proposes a productive approach to preserve the structure of the FeSe2 anode via in situ coating nitrogen-doped carbon (NC). The powerful interfacial interaction between FeSe2 micro-nanorods and NC facilitates fast Na+ /e− transport kinetics and ensures excellent structural stability of FeSe2 @NC. Consequently, FeSe2 @NC exhibits a capacity of 379.2 mA h g−1 at a high current density of 10 A g−1 and up to 100% reversible capacity over 1000 cycles at 5 A g−1 . Furthermore, the invertible Na+ storage mechanism of FeSe2 @NC is investigated by ex situ methods. When FeSe2 @NC is used as the anode and Na3 V2 (PO4 )2 F3 @reduced graphene oxide is used as the cathode to assemble a full battery, it also exhibits a capacity of 167.2 mA h g−1 even after 1000 cycles at 1 A g−1 . These exemplary results underscore the potential application value of FeSe2 @NC in fast-charging SIBs. [ABSTRACT FROM AUTHOR]- Published
- 2024
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