配位聚合物衍生的硒化锡@多孔碳纳米棒及其储钠性能研究

Tin selenide@porous carbon nanorods derived from coordination polymers and their sodium storageproperties

负极材料是钠离子电池的重要组成部分,其直接影响电池的比容量,倍率性能以及循环稳定性。金属硒化物因其高比容量和较高的反应动力学,被认为是最有前景的钠离子电池的负极材料之一。利用配位聚合物为前驱体,通过碳化-硒化策略,制备出SnSe2@多孔碳纳米棒。研究了碳化-硒化工艺对SnSe2@多孔碳纳米棒钠离子存储性能的影响。研究结果表明,700℃碳化结合400℃硒化获得的SnSe2@多孔碳纳米棒具有优异的钠离子存储性能,在10 A g^(-1)电流密度下,其可逆比容量达到172.6 mAh g^(-1),同时在5 A g^(-1)电流密度下,经过900周次循环后其比容量仍可达到175.8 mAh g^(-1)。

Anode electrode material is an important part of sodium ion battery,which directly affects the specific capacity,magnification performance and cycle stability of the battery.Metal selenides are considered as one of the most promising cathode materials for sodium ion batteries because of their high specific capacity and high reaction kinetics.SnSe2@PC nanorods were prepared by selenidation carbonization-selenium strategy using coordination polymers as precursors.The effect of selenium process on the sodium ion storage performance of SnSe2@PC nanorods was studied.The results show that SnSe2@PC nanoflowers obtained by carbonization at 700℃and selenidation at 400℃have excellent sodium ion storage properties,and their reversible specific capacity reaches 172.6mAh g^(-1) at 10Ag^(-1) current density.At the same time,under the current density of 5Ag^(-1),the specific capacity can still reach 175.8mAh g^(-1) after 900cycles.