Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, P.R. China.
Key Laboratory of Artificial Structure and Quantum Control, Ministry of Education, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China.
Chemistry. 2019 Nov 18;25(64):14598-14603. doi: 10.1002/chem.201902624. Epub 2019 Oct 23.
Two-dimensional molybdenum disulfide (MoS ) has been recognized as a promising anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity, but its rapid capacity decay owing to poor conductivity, structure pulverization, and polysulfide dissolution presents significant challenges in practical applications. Herein, triple-layered hollow spheres in which MoS nanosheets are fully encapsulated between inner carbon and outer nitrogen-doped carbon (NC) were fabricated. Such an architecture provides high conductivity and efficient lithium-ion transfer. Moreover, the NC shell prevents aggregation and exfoliation of MoS nanosheets and thus maintains the integrity of the nanostructure during the charge/discharge process. As anode materials for LIBs, the C@MoS @NC hollow spheres deliver a high reversible capacity (747 mA h g after 100 cycles at 100 mA g ) and excellent long-cycle performance (650 mA h g after 1000 cycles at 1.0 A g ), which confirm its potential for high-performance LIBs.
二维二硫化钼（MoS ）由于其理论容量高，已被认为是锂离子电池（LIB）的一种很有前途的阳极材料，但由于导电性差、结构粉碎和多硫化物溶解，其容量迅速衰减，在实际应用中带来了重大挑战。在此，制备了三层空心球，其中 MoS 纳米片完全包裹在内层碳和外层氮掺杂碳（NC）之间。这种结构提供了高导电性和高效的锂离子传输。此外，NC 壳可以防止 MoS 纳米片的聚集和剥落，从而在充放电过程中保持纳米结构的完整性。作为 LIB 的阳极材料，C@MoS@NC 空心球在 100 mA g 的电流密度下循环 100 次后具有 747 mA h g 的高可逆容量（在 100 mA g 的电流密度下循环 100 次后具有 747 mA h g 的高可逆容量），在 1.0 A g 的电流密度下循环 1000 次后仍具有 650 mA h g 的优异长循环性能，这证实了其在高性能 LIB 中的应用潜力。
