Author(s): Yuan, ZY (Yuan, Zeyu); Wang, LL (Wang, Lili); Li, DD (Li, DongDong); Cao, JM (Cao, Junming); Han, W (Han, Wei)

Source: ACS NANO Volume: 15 Issue: 4 Pages: 7439-7450 DOI: 10.1021/acsnano.1c00849 Published: APR 27 2021

Abstract: Sodium-ion batteries operating at room temperature have emerged as a generation of energy storage devices to replace lithium-ion batteries; however, they are limited by a lack of anode materials with both an adequate lifespan and excellent rate capability. To address this issue, we developed Nb2CTx MXene-framework MoS2 nanosheets coated with carbon (Nb2CTx@MoS2@C) and constructed a robust three-dimensional cross-linked structure. In such a design, highly conductive Nb2CTx MXene nanosheets prevent the restacking of MoS2 sheets and provide efficient channels for charge transfer and diffusion. Additionally, the hierarchical carbon coating has a certain level of volume elasticity and excellent electrical conductivity to guarantee the intercalation of sodium ions, facilitating both fast kinetics and long-term stability. As a result, the Nb2CTx@MoS2@C anode delivers an ultrahigh reversible capacity of 530 mA h g(-1) at 0.1 A g(-1) after 200 cycles and very long cycling stability with a capacity of 403 mA h g(-1) and only 0.01% degradation per cycle for 2000 cycles at 1.0 A g(-1). Moreover, this anode has an outstanding capacity retention rate of approximately 88.4% from 0.1 to 1 A g(-1) in regard to rate performance. Most importantly, the Nb2CTx@MoS2@C anode can realize a quick charge and discharge at current densities of 20 or even 40 A g(-1) with capacities of 340 and 260 mAh g(-1), respectively, which will increase the number of practical applications for sodium-ion batteries.

Accession Number: WOS:000645436800129

PubMed ID: 33754716

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Cao, Junming                  0000-0001-9347-160X

ISSN: 1936-0851

eISSN: 1936-086X

Full Text: https://pubs.acs.org/doi/10.1021/acsnano.1c00849