期刊
APPLIED SURFACE SCIENCE
卷 597, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2022.153598
关键词
Nb2CTx MXene framework; Alloying reaction; Sodium ion batteries; High capacity; DFT research
类别
资金
- National Natural Science Foundation of China (NSFC) [62174152, 21903034]
- Science and Technology Development Plan of Jilin Province [20210101168JC]
- Fundamental Research Funds for the Central Universities [2412022QD038]
Researchers have developed a new strategy to grow SnS nanorods on a Nb2CTx framework, resulting in a stable electrode (C@SnS@Nb2CTx/Nb2O5) with excellent performance for sodium-ion batteries.
Tin (Sn) and its derivatives have outstanding theoretical capacities; however, the phase transformation and alloying processes of SnSx in sodium-ion batteries (SIBs) greatly hinder their application. Compared with hexagonal SnS2, orthorhombic SnS exhibits a better structural stability and a smaller volume expansion, while undergoing a less severe conversion reaction. Thus, it can achieve better sodium-ion storage performance. Herein, we designed a strategy to grow SnS nanorods in situ on a Nb2CTx framework and three-dimensional (3D) carbon-reinforced Nb2CTx/SnS nanorods (C@SnS@Nb2CTx/Nb2O5). With the reducibility of Nb2CTx, hexagonal SnS2 can be transformed into a more stable orthorhombic SnS phase, thereby affording a more stable performance for SIBs. The resulting C@SnS@Nb2CTx/Nb2O5 electrodes exhibited excellent cycle capacities after 100 cycles at 0.1 A.g(-1) (similar to 384 mAh.g(-1)) and after 1,000 cycles at 1 A.g(-1) (similar to 220 mAh.g(-1)); they also exhibited excellent stability (73% capacity retention after 1,000 cycles, relative to the tenth cycle at a current density of 1 A.g(-1)). In addition, to analyze the underlying mechanism of the observed capacity decay in the cycle process, we conducted ex situ X-ray photoelectron spectroscopy, X-ray diffraction, and density-functional theory analyses. Thus, we compared and revealed the factors influencing the capacity decline observed during the SnS cycle process.
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