锰氧化物/碳氮三维网络结构复合材料的制备及锂电性能

Synthesis and Electrochemical Properties of Manganese Oxides/Carbon-Nitrogen Three-Dimensional Networks Composite as an Anode Material for Lithium Ion Batteries

通过硝酸锰和乙醇的水热反应在三聚氰胺泡棉(MF)上生成三氧化二锰颗粒,氮气下高温处理后形成锰氧化物负载碳氮三维网络结构的复合物。碳氮网络结构提高了充放电过程中材料结构的稳定性及导电性,且烧结过程中产生的孔道结构有利于锂离子传输,使得该复合材料作为负极在锂离子电池中表现出优异的充放电性能和循环稳定性。材料的比容量和循环稳定性大大提高,经500℃处理后的MnO/CNnws-500材料在160次循环后仍然保留590 m Ah·g^(-1)的比容量,达到氧化亚锰理论容量755 m Ah·g^(-1)的78%。

Sesquioxide coated on melamine foams （MF） were prepared by hydrothermal method using manganese nitrate and ethanol. After calcinating the resulting material at different temperatures in N2 atmosphere, manganese oxides loaded on C-N three-dimensional networks were obtained. Due to the presence of C-N networks, the structure stability and conductivity of the materials have been increased. The pores and channels generated during the calcination processes facilitate the lithium ions transportation. The composites present excellent charge/discharge ability and cycling stability as anode materials for lithium ion batteries. Therefore, the specific capacity and cycling stability have been greatly enhanced. MnO/CNnws-500 can maintain a specific capacity of 590 mAh ·g^-1 after 160 cycles which accounts for 78% of theoretical capacity （755 mAh ·g^-1） of manganese monoxide （MnO）.