微反应器不同陈化时间制备MnO/C的性能
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摘要
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。
Porous carbon coating manganese oxide(MnO/C)composite materials were prepared by a direct precipitation in T-shaped microreactor,using MnSO_4·H_2O and(NH_4)_2C_2O_4·H_2O as raw materials and glucose as carbon source.The influences of aging time on the structure,morphology and electrochemical performance of the prepared MnO/C were studied.As the aging time prolonged,the precursors and MnO/C evolved from the rod-like to agglomerated bulk particles.When the crystallinity of precursor and MnO/C material increased,the specific surface area and electrochemical performance of MnO/C decreased.The MnO/C prepared with aging time of 0 delivered a specific discharge capacity of 844 m Ah/g after 100 cycles at 2 C in 0.01-3.00 V.The5 C specific discharge capacity was 699 m Ah/g.
Porous carbon coating manganese oxide(MnO/C)composite materials were prepared by a direct precipitation in T-shaped microreactor,using MnSO_4·H_2O and(NH_4)_2C_2O_4·H_2O as raw materials and glucose as carbon source.The influences of aging time on the structure,morphology and electrochemical performance of the prepared MnO/C were studied.As the aging time prolonged,the precursors and MnO/C evolved from the rod-like to agglomerated bulk particles.When the crystallinity of precursor and MnO/C material increased,the specific surface area and electrochemical performance of MnO/C decreased.The MnO/C prepared with aging time of 0 delivered a specific discharge capacity of 844 m Ah/g after 100 cycles at 2 C in 0.01-3.00 V.The5 C specific discharge capacity was 699 m Ah/g.
引文
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[3]严鹏,谢刚,张志鹏,et al.微通道反应器制备锂离子电池正极材料磷酸铁锂[J].化工新型材料,2014,42(5):55-58.
[4]SU J,LIANG H,GONG X N,et al.Fast preparation of porous MnO/C microspheres as anode materials for lithium-ion batteries[J].Nanomaterials,2017,7(6):121-133.
[5]MA Z Y,CAO H L,ZHOU X F,et al.Hierarchical porous MnO/graphene composite aerogel as high-performance anode material for lithium ion batteries[J].RSC Advances,2017,7(26):15 857-15 863.
[6]CUI X,WANG Y,CHEN Z,et al.Preparation of pompon-like Mn O/carbon nanotube composite microspheres as anodes for lithium ion batteries[J].Electrochim Acta,2015,180:858-865.