共价有机聚合物/石墨烯复合材料的制备及锂电性能研究

Synthesis and Li-ion Storage Properties of COPs/rGO Composites

共价有机聚合物(COPs)作为一类新型材料,凭借其诸多优异特性得到越来越广泛的应用。本实验以三聚氰胺和1,4-二溴丁烷为原料合成片层结构的三聚氰胺基共价有机聚合物,片层厚度为3.5 nm左右。采用原位掺杂石墨烯(rGO)的方式制备COPs/rGO复合材料并测试了其作为锂电池负极材料的电化学性能。实验结果显示,电极材料在50 mA/g的条件下充放电循环100次后仍然保持有420 mAh/g的放电比容量,同时表现出优异的高电流密度和倍率性能。由此可以看出该COPs/rGO复合材料是一种很有前景的储锂材料。

Covalent organic polymer(COPs)is a kind of crystalline microporous polymer,which has been widely used due to its many excellent properties,such as high specific surface area,abundant pore size structure,low weight density.Here,melamine-based COPs with the lamellar structure were synthesized using melamine and 1,4-dibromobutane.The thickness of the flake is about 3.5 nm.COPs/rGO composites were prepared by in situ doping graphene(rGO)and the electrochemical performance as a lithium-ion battery anode materials was studied.The composite materials show a reversible capacity of 420 mAh/g after 100 cycles at a current density of 50 mA/g,at the same time,it shows excellent high current density and rate capability.