Background

The construction of heterostructures is considered to be an effective strategy to address the slow electronic and ionic dynamics of anode materials for sodium-ion batteries. However, realizing the directional growth and uniform distribution of heterostructures is still a great challenge.

In view of this, Prof. Jin Zhou et al. at Shandong University of Technology explored the construction of CoSe2/NiSe2 heterostructures in N-doped carbon Electrospun Nanofbers, demonstrating their potential for ultra-long lifetime in sodium-ion batteries. The related research results are summarized as “Bimetallic selenide heterostructure with directional built-in electric-field confined in N-doped carbon nanofibers for superior sodium storage with ultralong lifespan” was published in the Journal of Energy Chemistry.

The main points of this paper

1. In this study, novel CoSe2/NiSe2 heterostructures confined in N-doped carbon Electrospun Nanofbers (CoSe2/NiSe2@NC) were prepared using Co/Ni-ZIF templates, in which a uniform distribution of CoSe2/NiSe2 heterostructures was achieved.

2. Benefiting from the unique heterostructures and the nitrogen-doped carbon Electrospun Nanofbers, CoSe2/NiSe2@NC exhibits excellent multiplicity performance and long-lasting cycle life, with a reversible capacity of 400.5 mA h g-1 after 5000 cycles at 2 A g-1.

This study highlights the potential impact of precise control of the heterostructure on the electrochemical performance of SIB advanced anodes.

How directional built-in electric fields in heterogeneous structures promote superior sodium storage?

Directed embedded electric fields in heterostructures accelerate electrochemical reaction kinetics by promoting Na+ diffusion and enhancing electronic conductivity.

This property promotes more efficient embedding/de-embedding of Na+ during cycling, resulting in superior sodium storage performance.

What challenges are addressed by the regulated growth and uniform distribution of CoSe2/NiSe2 heterostructures in N-doped carbon Electrospun Nanofbers?

The regulated growth and uniform distribution of CoSe2/NiSe2 heterostructures in N-doped carbon Electrospun Nanofbers addresses challenges such as achieving directional growth, ensuring uniform distribution at the microscopic level, and providing a continuous pathway for fast Na+ and electron transfer. This approach improves the electrochemical performance of the anode material, thereby increasing the multiplication capacity and ultra-long life of sodium-ion batteries.

Originallink: https://doi.org/10.1016/j.jechem.2023.12.039