Rapidly Synthesized, Few-Layered Pseudocapacitive SnS2 Anode for High-Power Sodium Ion Batteries
Rapidly Synthesized, Few-Layered Pseudocapacitive SnS2 Anode for High-Power Sodium Ion Batteries
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DOI：
10.1021/acsami.7b11040
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发表时间：
2017-11-22
影响因子：
9.5
通讯作者：
Lee, Yun-Sung
中科院分区：
文献类型：
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作者：
Thangavel, Ranjith;Pandian, Amaresh Samuthira;Lee, Yun-Sung
钠资源的丰富推动了钠离子电池(SIB)作为商用锂离子电池替代品的研究。然而，传统钠阳极的低功率、低容量阻碍了其实际实现。虽然大多数研究都集中在大容量钠阳极的开发上，但高功率和高容量相结合的阳极还没有被广泛实现。在此，我们提出了一种简单的微波辐射技术，可以在几分钟内在石墨烯上获得少量分层的超薄二维SnS_2。SnS_2具有大量的表面活性中心，并表现出快速、无损的赝电容量诱导的高容量、快速的钠离子存储动力学。在高电流密度(12Ag(-1))下增强了钠离子存储，并伴随着高可逆性和高稳定性。此外，设计合理的钠离子全电池与SnS2//Na3V2(PO4)(3)耦合后表现出优异的性能，具有高初始库仑效率(99%)、高容量、高稳定性，即使在电流密度增加140倍后，仍保持接近初始容量的53%。此外，还观察到了接近140Wh kg(-1)的高比能量和8.3kW kg(-1)的超高比功率(基于阳极和阴极的质量)。由于其优异的性能和快速的合成，少层SnS_2有望成为实际实现高功率SIB的候选材料。
The abundance of sodium resources has recently motivated the investigation of sodium ion batteries (SIBs) as an alternative to commercial lithium ion batteries. However, the low power and low capacity of conventional sodium anodes hinder their practical realization. Although most research has concentrated on the development of high-capacity sodium anodes, anodes with a combination of high power and high capacity have not been widely realized. Herein, we present a simple microwave irradiation technique for obtaining few layered, ultrathin two-dimensional SnS2 over graphene sheets in a few minutes. SnS2 possesses a large number of active surface sites and exhibits high-capacity, rapid sodium ion storage kinetics induced by quick, nondestructive pseudocapacitance. Enhanced sodium ion storage at a high current density (12 A g(-1)), accompanied by high reversibility and high stability, was demonstrated. Additionally, a rationally designed sodium ion full cell coupled with SnS2//Na3V2(PO4)(3) exhibited exceptional performance with high initial Coulombic efficiency (99%), high capacity, high stability, and a retention of similar to 53% of the initial capacity even after the current density was increased by a factor of 140. In addition, a high specific energy of similar to 140 Wh kg(-1) and an ultrahigh specific power of 8.3 kW kg(-1) (based on the mass of both the anode and cathode) were observed. Because of its outstanding performance and rapid synthesis, few-layered SnS2 could be a promising candidate for practical realization of high-power SIBs.