Two-Dimensional Tin Disulfide Nanosheets for Enhanced Sodium Storage.
Sodium-ion batteries (SIBs) are considered as complementary alternatives to lithium-ion batteries for grid energy storage due to the abundance of sodium. However, low capacity, poor rate capability, and cycling stability of existing anodes significantly hinder the practical applications of SIBs. Herein, ultrathin two-dimensional SnS2 nanosheets (3-4 nm in thickness) are synthesized via a facile refluxing process toward enhanced sodium storage. The SnS2 nanosheets exhibit a high apparent diffusion coefficient of Na(+) and fast sodiation/desodiation reaction kinetics. In half-cells, the nanosheets deliver a high reversible capacity of 733 mAh g(-1) at 0.1 A g(-1), which still remains up to 435 mAh g(-1) at 2 A g(-1). The cell has a high capacity retention of 647 mA h g(-1) during the 50th cycle at 0.1 A g(-1), which is by far the best for SnS2, suggesting that nanosheet morphology is beneficial to improve cycling stability in addition to rate capability. The SnS2 nanosheets also show encouraging performance in a full cell with a Na3V2(PO4)3 cathode. In addition, the sodium storage mechanism is investigated by ex situ XRD coupled with high-resolution TEM. The high specific capacity, good rate capability, and cycling durability suggest that SnS2 nanosheets have great potential working as anodes for high-performance SIBs.
School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore.|Institute for Superconducting and Electronic Materials, University of Wollongong , Wollongong, NSW 2522, Australia.
Wenping
W
Sun
School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore.
Xianhong
X
Rui
School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore.
Dan
D
Yang
School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology , Gardens Point, Brisbane, QLD 4000, Australia.
Ziqi
Z
Sun
Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , Singapore 117602, Singapore.
Bing
B
Li
School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore.
Wenyu
W
Zhang
Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , Singapore 117602, Singapore.
Yun
Y
Zong
School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore.|Energy Research Institute@NTU, Nanyang Technological University , Research Techno Plaza, Singapore 637553, Singapore.
Srinivasan
S
Madhavi
Institute for Superconducting and Electronic Materials, University of Wollongong , Wollongong, NSW 2522, Australia.
Shixue
S
Dou
School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore.|Energy Research Institute@NTU, Nanyang Technological University , Research Techno Plaza, Singapore 637553, Singapore.
Qingyu
Q
Yan
anode; nanosheets; sodium-ion batteries; tin disulfide