MoC@Cu@C composites with structural advantages exhibit excellent electrochemical performance and stability in LIBs

Herein, we synthesized a porous carbon matrix composite (MoC@Cu@C) by pyrolyzing a compound consisting of a copper-based metal organic framework materials and a molybdenum-based polyoxometalate under nitrogen atmosphere. This is a mesoporous molybdenum carbide octahedron consisting of extremely small nanocrystals. Owing to the porous nature of the composite material and its surface-rich carbon matrix, it is believed to provide more active Li+ storage sites, which can enhance electrical conductivity and effectively inhibit volume expansion during cycling. Furthermore, the in-situ synthesis of copper in the sample can bring additional conductivity enhancement and good initial lithium deposition kinetics, doping of heteroatom N in organic ligands brings additional capacity. Benefit from this, the MoC@Cu@C anode shows good rate and cycling performance. When the battery is cycled 100 times at a current density of 100 mA g+1, it can achieve 100 % capacity retention with a high reversible capacity of 820 mAh g+1. Even when cycled at 2000 mA g+1, the capacity stabilizes at 526 mAh g1 new generation of anode materials for LIBs. , of which 98 % is retained after 1000 cycles. These features make the MoC@Cu@C composites a promising

Automated summary

A porous carbon matrix composite (MoC@Cu@C) was synthesized by pyrolyzing a compound of a copper-based metal organic framework material and a molybdenum-based polyoxometalate under nitrogen atmosphere. The composite material, consisting of a mesoporous molybdenum carbide octahedron with small nanocrystals, offers more active Li+ storage sites due to its porous nature and carbon-rich matrix. In-situ synthesis of copper enhances conductivity and initial lithium deposition kinetics, while heteroatom N doping in organic ligands provides additional capacity. The MoC@Cu@C anode exhibits excellent rate and cycling performance in lithium-ion batteries.