Ultrasmall SnS Quantum Dots Anchored onto Nitrogen-Enriched Carbon Nanospheres as an Advanced Anode Material for Sodium-Ion Batteries
- Authors
- Veerasubramani, Ganesh Kumar; Park, Myung-Soo; Choi, Jin-Yi; Kim, Dong-Won
- Issue Date
- Feb-2020
- Publisher
- AMER CHEMICAL SOC
- Keywords
- SnS quantum dot; carbon nanosphere; anode material; sodium-ion battery; energy storage
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.12, no.6, pp.7114 - 7124
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 12
- Number
- 6
- Start Page
- 7114
- End Page
- 7124
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/10772
- DOI
- 10.1021/acsami.9b18997
- ISSN
- 1944-8244
- Abstract
- Structural pulverization of metal chalcogenides such as Sn-based compounds is a serious issue for development of high-performance anode materials and results in serious capacity fading during continuous charge and discharge cycles. In this work, we synthesize ultrasmall SnS quantum dots (QDs) anchored onto nitrogen-enriched carbon (NC) nanospheres through facile hydrothermal and carbonization processes to prepare a progressive anode material for sodium-ion batteries. The optimized SnS QDs@NC electrode delivered an initial discharge capacity of 281 mAh g(-1) at 100 mA g(-1) and exhibited excellent cycling stability with a capacity retention of 75% after 500 cycles at a high current density of 1000 mA g(-1). Ex situ XRD, XPS, FE-SEM, TEM measurements, and kinetics study were performed to unveil the sodium storage mechanism of the SnS QDs@NC electrode. A sodium-ion full cell assembled with an SnS QDs@NC anode and a Na3V2(PO4)(3) cathode exhibited high capacity and good cycling stability. Such a superior electrochemical performance of SnS QDs@NC can be attributed to the synergistic effects of NC and SnS QDs where NC serves as a conducting matrix to support SnS QDs and helps avoid structural degradation. This work provides a promising strategy to resolve the pulverization issue of alloying and conversion-type anode materials.
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