共轭微孔聚合物管状硬炭的氮掺杂与储锂性能

Nitrogen doping of tubular hard carbon as conjugate microporous polymer and its lithium storage performance

通过选择不同单体合成了共轭微孔聚合物(CMP)和含氮共轭微孔聚合物(NCMP),并分别将其高温热解制备管状硬炭(THC)和氮掺杂管状硬炭(NTHC).通过SEM、TEM和BET对两种管状材料的形貌结构进行了表征,THC和NTHC材料具有相似的形貌和比表面积.进一步采用恒电流充放电法对THC和NTHC进行电化学性能分析,并与普通碳纳米管(CNT)的电化学性能相比较.结果表明,NTHC储锂性能最好,在0.1 A/g时,NTHC的可逆储锂容量高达541.2 mAh/g,在0.6 A/g电流密度下,其比容量在经过500次循环后仍高达458 mAh/g.

Conjugate microporous polymer(CMP)and nitrogen-contained conjugate microporous polymer(NCMP)were synthesized with chosen different monomers and the tubular hard carbon(THC)and N-doped tubular hard carbon(NTHC)were prepared by means of pyrolysis of those two kinds of CMP.The morphology and structure of the two tubular hard carbons were characterized with SEM,TEM and BET and it is shown that the materials of THC and NTHC have similar morphology and specific surface area.Further,The electrochemical property of THC and NTHC then compared with that of common carbon nanotube(CNT)was analyzed by constant current charge and discharge method and the result showed that the lithium storage performance of NTHC would be the best and it would have a high reversible lithium storage capacity of 541.2 mAh/g at 0.1 A/g and its specific capacity would retain around 458 mAh/g at 0.6 A/g after 500 cycles.