Nguyen Thang Phan, Kim Il Tae
Department of Chemical and Biological Engineering, Gachon University, Seongnam-si 13120, Gyeonggi-do, Korea.
Nanomaterials (Basel). 2021 Mar 3;11(3):626. doi: 10.3390/nano11030626.
Metallic phase 1T MoS is a well-known potential anode for enhancing the electrochemical performance of lithium-ion batteries owing to its mechanical/chemical stability and high conductivity. However, during the lithiation/delithiation process, MoS nanosheets (NSs) tend to restack to form bulky structures that deteriorate the cycling performance of bare MoS anodes. In this study, we prepared Ag nanoparticle (NP)-decorated 1T MoS NSs via a liquid exfoliation method with lithium intercalation and simple reduction of AgNO in NaBH. Ag NPs were uniformly distributed on the MoS surface with the assistance of 3-mercapto propionic acid. Ag NPs with the size of a few nanometers enhanced the conductivity of the MoS NS and improved the electrochemical performance of the MoS anode. Specifically, the anode designated as Ag3@MoS (prepared with AgNO and MoS in a weight ratio of 1:10) exhibited the best cycling performance and delivered a reversible specific capacity of 510 mAh·g (approximately 73% of the initial capacity) after 100 cycles. Moreover, the rate performance of this sample had a remarkable recovery capacity of ~100% when the current decreased from 1 to 0.1 A·g. The results indicate that the Ag nanoparticle-decorated 1T MoS can be employed as a high-rate capacity anode in lithium-ion storage applications.
金属相1T硫化钼由于其机械/化学稳定性和高导电性，是一种众所周知的可增强锂离子电池电化学性能的潜在负极材料。然而，在锂化/脱锂过程中，硫化钼纳米片（NSs）容易重新堆叠形成庞大的结构，这会降低裸露的硫化钼负极的循环性能。在本研究中，我们通过液体剥离法，借助锂嵌入以及在硼氢化钠中简单还原硝酸银，制备了银纳米颗粒（NP）修饰的1T硫化钼纳米片。在3-巯基丙酸的辅助下，银纳米颗粒均匀分布在硫化钼表面。尺寸为几纳米的银纳米颗粒提高了硫化钼纳米片的导电性，并改善了硫化钼负极的电化学性能。具体而言，标记为Ag3@MoS的负极（由硝酸银和硫化钼按重量比1:10制备）表现出最佳的循环性能，在100次循环后可逆比容量为510 mAh·g（约为初始容量的73%）。此外，当电流从1 A·g降至0.1 A·g时，该样品的倍率性能具有约100%的显著恢复容量。结果表明，银纳米颗粒修饰的1T硫化钼可作为锂离子存储应用中的高倍率容量负极材料。
