摘要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快的反应动力学，被认为是最有前景的钠离子电池的负极材料之一。本文利用配位聚合物为前驱体，通过碳化-硒化策略，制备出SnSe2@多孔碳纳米复合材料。研究了碳化-硒化工艺对SnSe2@多孔碳纳米复合材料钠离子存储性能的影响。研究结果表明，700℃碳化结合400℃硒化处理获得的SnSe2@多孔碳纳米复合材料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。
Abstract：Anode material is an important part of sodium ion battery, which directly affects the specific capacity, rate performance and cycling stability of the sodium ion batteries. Metal selenides are considered as one of the most promising anode materials for sodium ion batteries due to their high specific capacity and high reaction kinetics. In this paper, SnSe2@porous carbon (PC) nanocomposites were prepared by carbonization-selenidation strategy using coordination polymers as precursors. The effect of selenidation process on the sodium ion storage performance of SnSe2@PC nanocomposites was investigated. The results showed that SnSe2@PC nanocomposites obtained by carbonization at 700 ℃ and selenidation at 400 ℃ exhibited excellent sodium ion storage properties, and their reversible specific capacity reached 172.6 mAh g-1 at 10 A g-1 current density. At the same time, under the current density of 5 A g-1, the specific capacity still remained 175.8 mAh g-1 after 900 cycles.
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