Facile synthesis of metal disulfides nanoparticles encapsulated by amorphous carbon composites as high-performance electrode materials for lithium storage

摘要: Abstract With the purpose to settle aggregation and conductivity issues of active materials, metal disulfides (MS2, M = Fe, Co) nanoparticles in-situ encapsulated by amorphous carbon layers (MS2@C) have been synthesized directly vulcanizing iron (III) acetylacetonate or cobalt (II) acetylacetonate, which are both source source, using sulfur power as S dispersant a facile one-step heating method. A structure that MS2 well wrapped layer uniformly coated many ultra-small is obtained. Benefiting from unique multidimensional integrates advantages low-dimensional nanostructures high-dimensional bulk structure, FeS2@C CoS2@C composites evaluated electrode materials for lithium storage exhibit superior electrochemical performance. After 100 charge-discharge cycles, this novel architecture delivers reversible capacity 829 mAh g−1 at 100 mA g−1. Moreover, high specific 480 mAh 1000 mA g−1 after 500 cycles As composite, 481 mAh 500 mA g−1 300 still displayed. This remarkable cycling property rate capability demonstrate potential applications next-generation lithium-ion batteries.