Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 3, Pages 2637-2648Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b18195
Keywords
SnS2; dual doping; graphene aerogel; cycling performance; sodium ion batteries
Funding
- National Natural Science Foundation of China [51572194, 51672189]
- Academic Innovation Funding of Tianjin Normal University [52XC1404]
- Training Plan of Leader Talent of University in Tianjin
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We report the effort in designing layered SnS2 nanocrystals decorated on nitrogen and sulfur dual-doped graphene aerogels (SnS2@N,S-GA) as anode material of SIBs. The optimized mass loading of SnS2 along with the addition of nitrogen and, sulfur on the surface of GAs results in enhanced electrochemical performance of SnS2@N,S-GA composite. In. particular, the introduction of nitrogen and sulfur heteroatoms could provide more active sites and good accessibility for Na ions. Moreover, the incorporation of the stable SnS2 crystal structure within the anode results in the superior discharge capacity of 527 mAh g(-1) under a current density of 20 mA g(-1) upon 50 cycles. It maintains 340 mAh g(-1) even the current density is increased to 800 mA g(-1). Aiming to further systematically study Mechanism of composite with improved SIB performance, we construct the corresponding models based on experimental data and conduct first-principles calculations. The calculated :results indicate the sulfur atoms doped in GAs show a strong bridging effect with the SnS2 nanocrystals, contributing to build robust architecture for electrode. Simultaneously, heteroatom dual doping of GAs shows the imperative function for improved electrical conductivity. Herein, first-principles calculations present a theoretical explanation for outstanding cycling properties of SnS2@N,S-GA composite.
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