Metal–organic framework-derived CoSe2@N-doped carbon nanocubes for high-performance lithium-ion capacitors

• Published in: Rare metals Vol. 43; no. 5; pp. 2150 - 2160
• Main Authors: Wang, Lei, Zhang, Xiong, Kong, Yan-Yan, Li, Chen, An, Ya-Bin, Sun, Xian-Zhong, Wang, Kai, Ma, Yan-Wei
• Format: Journal Article
• Language: English
• Published: Beijing Nonferrous Metals Society of China 01.05.2024; Springer Nature B.V
• Subjects: Anodes; Biomaterials; Capacitors; Carbon; Chemistry and Materials Science; Energy; Ion storage; Lithium; Lithium ions; Materials Engineering; Materials Science; Metal-organic frameworks; Metallic Materials; Nanoscale Science and Technology; Original Article; Physical Chemistry; Structural stability; Substrates; N-doped carbon; Lithium capacitors; Cobalt selenide; Metal–organic frameworks
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-023-02600-w

Cobalt selenide (CoSe 2 ) has garnered considerable attention as a prospective anode candidate for advanced lithium-ion storage, prompting comprehensive investigations. However, CoSe 2 -based anodes usually suffer from significant volume variation upon lithiation, leading to unsatisfactory cycling stability. Herein, a versatile synthesis route is proposed for the in-situ fabrication of CoSe 2 nanoparticles embedded in N-dope carbon skeleton (CoSe 2 @NC) through annealing treatment and selenization of a metal–organic framework-derived (MOF) precursor. The N-doped carbon derived from the MOF serves not only as an excellent conductive substrate but also as a confined reactor, effectively inhibiting the structural instability and alleviating the inevitable volume change of CoSe 2 . Owing to their unique nanostructure, the as-prepared CoSe 2 @NC exhibits a high capacity of 745.9 mAh·g −1 at 0.1 A·g −1 , while maintaining excellent rate capability and an impressive lifespan. Furthermore, the assembled lithium-ion capacitor (LIC) based on CoSe 2 @NC demonstrates an energy density of 130 Wh·kg −1 , a power density of 24.6 kW·kg −1 , and remarkable capacity retention of 90.8% after 8000 cycles. These results highlight the great potential of CoSe 2 @NC for practical applications. Graphical Abstract