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Vertically-grown few-layer MoS2 nanosheets on hierarchical carbon nanocages for pseudocapacitive lithium storage with ultrahigh-rate capability and long-term recyclability
摘要： Molybdenum disulfide (MoS2) are intensively studied anode materials for lithium-ion batteries (LIBs) owing to the high theoretical capacity, but still confront the severe challenges of unsatisfied rate capability and cycle life to date. Herein, few-layer MoS2 nanosheets are vertically grown on the hierarchical carbon nanocages (hCNC) via a facile hydrothermal method, which introduce pseudocapacitive lithium storage owing to the highly-exposed MoS2 basal planes, enhanced conductivity and facilitated electrolyte access arising from the well hybridization with hCNC. As a result, the optimized MoS2/hCNC exhibits the reversible capacity of 1670 mAh g-1 at 0.1 A g-1 after 50 cycles, 621 mAh g-1 at 5.0 A g-1 after 500 cycles, and 196 mAh g-1 at 50 A g-1 after 2,500 cycles, staying at the top level of the MoS2-based anode materials. The specific power and specific energy can reach to 16.1 kW kg-1 electrode and 252.8 Wh kg-1 electrode after 3,000 cycles, respectively, showing the great potential in high-power and long-life LIBs. This finding suggests a promising strategy for exploring advanced anode materials with high reversible capacity, high-rate capability and long-term recyclability.
关键词： pseudocapacitive lithium storage,vertical few-layer MoS2,hierarchical carbon nanocages,long-term recyclability,ultrahigh-rate capability
更新于2025-09-23 15:23:52
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Realization of GaN-based gain-guided blue laser diodes by helium ion implantation
摘要： Na4MnV(PO4)3 (denoted as NMVP) has drawn increasing attention owing to the three-dimensional framework and high theoretical capacity. Nevertheless, the inherent low electronic conductivity of NMVP impedes the scale-up commercial applications. In this work, the feasibility to achieve ultrahigh-rate capability and long lifespan by in situ embedding the intertwined carbon nanotube (CNT) matrix into the bulk of Na4MnV-(PO4)3@C composites through a facile wet-chemical approach is reported. The elaborately prepared Na4MnV(PO4)3@C@CNTs cathode delivers a discharge capacity of 109.9 mA h g?1 at C/5 with an impressive rate capability of 68.9 mA h g?1 at an ultrahigh current rate of 90 C as well as a fascinating cycling performance of 68.3% capacity retention at 40 C after 4000 cycles. The optimum design of the 3D well-interconnected NMVP permitting fast kinetics for transported Na+/e? is bene?cial to the excellent electrochemical performance, which is further studied by the galvanostatic intermittent impedance spectra measurements. The pseudocapacitance contributions are also investigated. The research demonstrates that the dual-nanocarbon synergistically modi?ed NMVP composite is expected to facilitate the commercialization of sodium-ion batteries.
关键词： Na4MnV(PO4)3,sodium-ion batteries,ultrahigh-rate capability,long lifespan,CNTs
更新于2025-09-11 14:15:04