以MnSO_4·H_2O和(NH_4)_2C_2O_4·H_2O为原料,葡萄糖为碳源,通过T形微反应器用直接沉淀法合成多孔碳(C)包覆一氧化锰(MnO)复合材料,并研究陈化时间对材料结构、形貌及电化学性能的影响。随着陈化时间的延长,前驱体及MnO/C由棒...以MnSO_4·H_2O和(NH_4)_2C_2O_4·H_2O为原料,葡萄糖为碳源,通过T形微反应器用直接沉淀法合成多孔碳(C)包覆一氧化锰(MnO)复合材料,并研究陈化时间对材料结构、形貌及电化学性能的影响。随着陈化时间的延长,前驱体及MnO/C由棒状演变为团聚块状体,前驱体及MnO/C材料的结晶度增加,MnO/C的比表面积减小,电化学性能变差。陈化时间为0时,合成的MnO/C以2 C在0.01~3.00 V循环100次,放电比容量为844 m Ah/g,5 C放电比容量为699 m Ah/g。展开更多
A strategy was developed to fabricate a set of MnO@C nanohybrids with MnO nanopartides （NPs） embedded in an ultrathin three-dimensional （3D） carbon framework for use as anode materials for lithium-ion batteries （...A strategy was developed to fabricate a set of MnO@C nanohybrids with MnO nanopartides （NPs） embedded in an ultrathin three-dimensional （3D） carbon framework for use as anode materials for lithium-ion batteries （LIBs）. The 3D carbon frameworks provide MnO NPs with electrical pathways and mechanical robustness, which efficiently improved the reaction kinetics, prevented the MnO from fracturing and agglomerating, and limited the formation of a solid electrolyte interface （SEI） at the MnO-electrolyte interface. Benefitting from the unique 3D framework structure, the MnO/C nanohybrids carbonized at 500 ℃ exhibited a highly reversible specific capacity of 1,420 mAh.g-1 at 0.2 A.g-1, excellent cycling stability with 98% capacity retention, and enhanced rate performance of 680 mAh-g-1 at 2 A.g-L The feasibility of the large-scale production of such MnO/C nanohybrids, associated with their outstanding Li-ion storage properties, opens a promising avenue for the development of high-performance anodes for next- generation LIBs.展开更多
文摘以MnSO_4·H_2O和(NH_4)_2C_2O_4·H_2O为原料,葡萄糖为碳源,通过T形微反应器用直接沉淀法合成多孔碳(C)包覆一氧化锰(MnO)复合材料,并研究陈化时间对材料结构、形貌及电化学性能的影响。随着陈化时间的延长,前驱体及MnO/C由棒状演变为团聚块状体,前驱体及MnO/C材料的结晶度增加,MnO/C的比表面积减小,电化学性能变差。陈化时间为0时,合成的MnO/C以2 C在0.01~3.00 V循环100次,放电比容量为844 m Ah/g,5 C放电比容量为699 m Ah/g。
文摘A strategy was developed to fabricate a set of MnO@C nanohybrids with MnO nanopartides （NPs） embedded in an ultrathin three-dimensional （3D） carbon framework for use as anode materials for lithium-ion batteries （LIBs）. The 3D carbon frameworks provide MnO NPs with electrical pathways and mechanical robustness, which efficiently improved the reaction kinetics, prevented the MnO from fracturing and agglomerating, and limited the formation of a solid electrolyte interface （SEI） at the MnO-electrolyte interface. Benefitting from the unique 3D framework structure, the MnO/C nanohybrids carbonized at 500 ℃ exhibited a highly reversible specific capacity of 1,420 mAh.g-1 at 0.2 A.g-1, excellent cycling stability with 98% capacity retention, and enhanced rate performance of 680 mAh-g-1 at 2 A.g-L The feasibility of the large-scale production of such MnO/C nanohybrids, associated with their outstanding Li-ion storage properties, opens a promising avenue for the development of high-performance anodes for next- generation LIBs.
