石墨烯
阳极
材料科学
二硫化钼
锂(药物)
纳米技术
化学工程
电化学
兴奋剂
复合材料
光电子学
电极
化学
医学
物理化学
内分泌学
工程类
作者
Siyu Liu,Kaili Jia,Juan Yang,Songjie He,Zhibin Liu,Xiaoting Wang,Jieshan Qiu
标识
DOI:10.1016/j.cej.2023.146181
摘要
Layered molybdenum disulfide (MoS2) is a promising anode material for lithium-ion storage and its coupling with graphene can further improve the specific capacity and cycling stability. In this work, a feasible polyacrylamide (PAM)-assisted approach to prepare the flower-like MoS2 nanosheets encapsulated by nitrogen-doped graphene (FL-MoS2/N-G) is proposed. The PAM is taken as the directing agent for the layered assembly of graphene and further confined growth of FL-MoS2 in the interlayers of the graphene. The unique encapsulation construction of MoS2 and N-doped graphene leads to the high loading of active species and stabilized structural integrity after the continuous Li+ ion intercalations. Theoretical simulation results reveal that the MoS2 nanosheets coupled with N-doped graphene can accelerate the charge transfer process and create extra lithiation sites with decreased diffusion resistance of Li+ ions. As the anode material in lithium-ion batteries (LIBs), the target FL-MoS2/N-G composite exhibits a high reversible capacity of about 1202 mAh g−1 at 0.2 A g−1 and it can remain 835 mAh g−1 even at 5 A g−1, highlighting an excellent rate capacity. Additionally, the FL-MoS2/N-G anode is also capable of delivering a long-term cycling performance with a capacity retention of about 78% after 800 cycles. Furthermore, benefiting from the fast charge transfer process of the FL-MoS2/N-G dominated by surface capacitive behavior, the lithium-ion hybrid capacitor with good electrochemical performance was fabricated to brighten its practical application prospect. The current work presents a new insight into the fabrication of high-loading MoS2/N-doped graphene composites with unique nanostructures for high-performance lithium-ion storage.
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