Key Takeaways & Executive Findings
- •• A novel MoO2/MoS2 heterostructure embedded in N,S-doped carbon nanofibers (MoO2/MoS2@NSC) was synthesized via electrospinning and sulfurization, exhibiting exceptional electrochemical performance for both lithium-ion and sodium-ion batteries. • The one-dimensional carbon fiber skeleton and N/S doping synergistically enhance ion diffusion kinetics and provide abundant active sites, leading to high-rate capability and ultralong cycling stability. • For LIBs, MoO2/MoS2@NSC delivers a high reversible capacity of 640 mAh g−1 after 2000 cycles at 5.0 A g−1 with an ultralow capacity decay of 0.002% per cycle, and an outstanding rate capability of 614 mAh g−1 at 10.0 A g−1. • For SIBs, the material also demonstrates superior performance with a reversible capacity of 242 mAh g−1 at 2.0 A g−1 over 2000 cycles and 261 mAh g−1 at 5.0 A g−1, highlighting its potential as a universal anode material. • The introduction of a heterointerface between MoS2 nanosheets and MoO2 bulk phase facilitates rapid Li+/Na+ transport, offering a promising strategy for designing high-efficiency energy storage materials.
Abstract
It is imperative to design suitable anode materials for both lithium-ion (LIBs) and sodium-ion batteries (SIBs) with a high-rate performance and ultralong cycling life. We fabricated a MoO2/MoS2 heterostructure that was then homogeneously distributed in N,S-doped carbon nanofibers (MoO2/MoS2@NSC) by electrospinning and sulfurization. The one-dimensional carbon fiber skeleton serves as a conductive frame to decrease the diffusion pathway of Li+/Na+, while the N/S doping creates abundant active sites and significantly improves the ion diffusion kinetics. Moreover, the deposition of MoS2 nanosheets on the MoO2 bulk phase produces an interface that enables fast Li+/Na+ transport, which is crucial for achieving high efficiency energy storage. Consequently, as the anode for LIBs, MoO2/MoS2@NSC gives an excellent cycling stability of 640 mAh g−1 for 2000 cycles under 5.0 A g−1 with an ultralow average capacity drop of 0.002% per cycle and an exceptional rate capability of 614 mAh g−1 at 10.0 A g−1. In SIBs, it also produces a significantly better electrochemical performance (reversible capacity of 242 mAh g−1 under 2.0 A g−1 for 2000 cycles and 261 mAh g−1 under 5.0 A g−1). This work shows how introducing a novel interface in the anode can produce rapid Li+/Na+ storage kinetics and a long cycling performance.
1. Introduction
Thanks to the high energy density of lithium-ion batteries (LIBs), they have quickly become the dominant choice for luggable electronic devices, electric transportation vehicles, and extensive energy storage solutions. Especially, the sales of new-energy vehicles using LIBs as power source have been increasing in recent years [1–4]. However, the further popularization and promotion of electric vehicles have been restricted by a series of factors, such as cruising range and charging rate. Consequently, it is of utmost importance to diligently pursue the electrode materials with high-rate performance and superior reversible capacity [5–6].
Moreover, the sustainable applicability of LIB system is limited by the scarcity of terrestrial reserves and ever-increasing consumption of lithium resource. Sodium-ion batteries (SIBs) with a similar working mechanism to LIBs are considered an alluring alternative by virtue of abundant sodium resources (2.3% (mass fraction) abundance on earth) and low price. Hence, as a “drop-in technology”, the accomplishments achieved for LIBs can be seamlessly applied for SIBs [7–8]. Regrettably, the two systems exhibit a sequence of fundamental disparities due to the distinct charge carriers, such as the cation size or standard redox potential, which renders the selection of electrode materials more arduous [9].
Polyoxometalates (POMs) are a unique class of metal oxides, consisting of early transition metal atoms that are intricately bridged with oxygen atoms via co-edge, co-angle, or co-planar modes [10–12]. As an “electron sponge”, POMs have been extensively applied in the fields of catalysis, sensing, detection and energy storage. This is primarily attributable to their various electronic structures and remarkable capacity for reversible multi-electron redox [13–19]. Recent research manifests that POMs with the advantages of low cost, facile synthesis, and highly redox-active metal elements hold great potential.
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ZHANG Chun-hui, ZHANG Jia-yuan, ZHAN Jie-yang, YU Jian, FAN Lin-lin, YANG An-ping, LIU hong, GAO Guang-gang (2025). A new anode material for high rate and long life lithium/sodium storage. SinoTechIntel Verified Research. https://doi.org/10.1016/S1872-5805(NCM2024-39-02-09)
Research & Educational Purpose Only:The translations, structured abstracts, analytical annotations, and data reports provided by SinoTechIntel are intended exclusively for academic research, internal corporate R&D, and educational benchmarking. They do not constitute formal engineering, chemical safety, legal, or professional advice.
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Frequently Asked Questions
What is the novel anode material reported in this paper?
The paper reports a MoO2/MoS2 heterostructure homogeneously distributed in N,S-doped carbon nanofibers (MoO2/MoS2@NSC), synthesized via electrospinning and sulfurization, which serves as an advanced anode material for both lithium-ion and sodium-ion batteries.
How does the MoO2/MoS2@NSC material achieve high-rate performance?
The one-dimensional carbon fiber skeleton provides a conductive framework that shortens ion diffusion pathways, while N/S doping creates abundant active sites and improves ion diffusion kinetics. Additionally, the heterointerface between MoS2 nanosheets and MoO2 bulk phase facilitates fast Li+/Na+ transport, collectively enabling high-rate capability.
What are the key electrochemical performance metrics for LIBs?
For LIBs, MoO2/MoS2@NSC delivers an excellent cycling stability of 640 mAh g−1 for 2000 cycles at 5.0 A g−1 with an ultralow average capacity drop of 0.002% per cycle, and an exceptional rate capability of 614 mAh g−1 at 10.0 A g−1.
What are the key electrochemical performance metrics for SIBs?
For SIBs, the material exhibits a reversible capacity of 242 mAh g−1 under 2.0 A g−1 for 2000 cycles and 261 mAh g−1 under 5.0 A g−1, demonstrating significantly better electrochemical performance.
What is the significance of the heterostructure in this work?
The heterostructure between MoS2 and MoO2 creates an interface that enables rapid Li+/Na+ transport, which is crucial for achieving high-efficiency energy storage. This work shows how introducing a novel interface in the anode can produce rapid storage kinetics and long cycling performance.
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