SnS_(2)/SnS/NC异质结构微米花的构筑及储钾性能探究

Construction and K-ion Storage Properties of SnS_(2)/SnS/NC Heterostructures Micro-flowers

采用水热法制备SnS_(2)微米花(MFs),以聚多巴胺衍生的氮掺杂碳(NC)作为还原剂和缓冲基质,合成了SnS_(2)/SnS/NC异质结构微米花(SSNC MFs)作为钾离子电池负极材料。SnS_(2)和SnS形成的异质界面加快了电荷的转移,进而改善了电化学动力学。同时,NC增强了复合材料的导电性和结构稳定性。因而,SSNC MFs电极在0.1 A/g下,循环50周的可逆比容量为492.4 mAh/g,2.0 A/g下仍保持在199.6 mAh/g,远大于相同测试条件下的SnS_(2) MFs电极(分别为132.1和28.4 mAh/g),表现出显著提升的可逆比容量、循环稳定性和倍率性能。

SnS_(2) micro-flowers(MFs)were synthesized by hydrothermal,and then SnS_(2)/SnS/NC heterostructures micro-flowers(SSNC MFs)were constructed by PDA-derived carbon as reducing agent and buffer substrate.SSNC MFs was evaluated as KIBs anode material,the interfaces of SnS_(2)/Sn heterostructures facilitate the charge transfer and further improve the kinetics.Meanwhile,the nitrogen-doped carbon layer improved the conductivity and structural stability of the hybrid electrode.As a result,the as-prepared SSNC MFs electrode exhibits improved specific capacity,cycle stability and rate performance.It delivered the reversible capacity of 492.4 mAh/g at 0.1 A/g after 50 cycles and 199.6 mAh/g was remained at 2.0 A/g,which was much higher than that of the SnS_(2) MFs electrode(132.1 mAh/g and 28.4 mAh/g at the same condition,respectively).