NiFe2V2O8@N-Doped carbon Yolk-Double shell spheres for efficient lithium storage

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 454; p. 140045
• Main Authors: Yang, Chenyu, Wang, Xiao, Ren, Yongqiang, Gu, Shaonan, Wang, Qian, Li, Huan, Yue, Kun, Gao, Tingting, Zhou, Guowei
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.02.2023
• Subjects: Fast ion-diffusion kinetics; Lithium-ion batteries; Polymetallic oxide nanostructures; Synergetic cation and oxygen redox; Yolk-double shell architectures; Lithium-ion batteries; Fast ion-diffusion kinetics; Polymetallic oxide nanostructures; Yolk-double shell architectures; Synergetic cation and oxygen redox
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2022.140045

NiFe2V2O8@NC nanostructures with hierarchically porous yolk-double shell spherical architectures are elaborately fabricated via a facile template-free protocol. Benefited from the expanded ion-transport channels, as well as the activation of synergetic cation-oxygen redox, the electrode manifests excellent rate capability and cycling stability. [Display omitted] •NiFe2V2O8@NC nanospheres with hierarchically yolk-double shell are fabricated.•The porous yolk-double shell can accommodate sufficient volume change.•Synergetic cation and oxygen redox is realized by active vanadium redox couples.•NiFe2V2O8@NC harvest a high reversible capacity of 1347.6 mA h g−1 over 200 cycles.•LiCoO2// NiFe2V2O8@NC lithium ion full-cells are assembled and evaluated. Polymetallic oxide nanostructures with intricate architectures have become the promising subject of much recent investigations into high-efficiency electrode materials for lithium-ion batteries (LIBs). However, their smooth implementation is still plagued by the fabrication of multi-component structures as well as the delivered inadequate specific capacities. Here, complex NiFe2V2O8@N-doped carbon nanostructures with hierarchically porous yolk-double shell spherical architectures via a facile template-free approach are developed and evaluated as the high-efficiency anode materials for LIBs. Benefited from the yolk-double shell constructions, impressively, the electrode harvests a high reversible capacity of 1347.6 mA h g−1 over 200 cycles without visible deterioration at 0.2 A g−1, a robust rate capability (726.1 mA h g−1 at 5 A g−1), and a desirable cycle stability (75.6% capacity retention over 300 cycles at 1 A g−1). Such excellent electrochemical Li-ion storage capability is believed to result from the fast ion-diffusion kinetics enabled by the synergetic cation and oxygen redox because of the introduction of vanadium redox couples, which can be further boosted by capacitive-dominated surface electrochemical reaction. This work provides enlightening insights into the elaborate design and fabrication of complex porous yolk-shell-like nanostructures with intricate compositions for high-efficiency lithium storage.