Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.
Nanoscale. 2014 Apr 7;6(7):3889-94. doi: 10.1039/c3nr06409c.
Herein we report the design and synthesis of fluorine-doped, carbon-encapsulated hollow Fe3O4 spheres (h-Fe3O4@C/F) through mild heating of polyvinylidene fluoride (PVDF)-coated hollow Fe3O4 spheres. The spheres exhibit enhanced cyclic and rate performances. The as-prepared h-Fe3O4@C/F shows significantly improved electrochemical performance, with high reversible capacities of over 930 mA h g(-1) at a rate of 0.1 C after 70 cycles, 800 mA h g(-1) at a rate of 0.5 C after 120 cycles and 620 mA h g(-1) at a rate of 1 C after 200 cycles. This improved lithium storage performance is mainly ascribed to the encapsulation of the spheres with fluorine-doped carbon, which not only improves the reaction kinetics and stability of the solid electrolyte interface film but also prevents aggregation and drastic volume change of the Fe3O4 particles. These spheres thus represent a promising anode material in lithium-ion battery applications.
在此，我们通过温和加热聚偏二氟乙烯（PVDF）包覆的空心 Fe3O4 球，报告了氟掺杂碳包覆空心 Fe3O4 球（h-Fe3O4@C/F）的设计和合成。这些球表现出增强的循环和倍率性能。所制备的 h-Fe3O4@C/F 表现出显著改善的电化学性能，在 70 次循环时以 0.1 C 的速率具有超过 930 mA h g(-1)的可逆容量，在 120 次循环时以 0.5 C 的速率具有 800 mA h g(-1)的可逆容量，在 200 次循环时以 1 C 的速率具有 620 mA h g(-1)的可逆容量。这种改进的锂存储性能主要归因于球的氟掺杂碳包覆，这不仅提高了固体电解质界面膜的反应动力学和稳定性，而且防止了 Fe3O4 颗粒的聚集和剧烈的体积变化。因此，这些球代表了锂离子电池应用中一种有前途的阳极材料。
