Jiang Fuyi, Yan Xinsheng, Du Rong, Kang Litao, Du Wei, Sun Jianchao, Zhou Yanli
School of Environmental and Materials Engineering, Yantai University, Yantai 264005, China.
Nanomaterials (Basel). 2019 Jul 10;9(7):996. doi: 10.3390/nano9070996.
The spherical-graphite/FeO composite has been successfully fabricated by a simple two-step synthesis strategy. The oxygenous functional groups between spherical-graphite and FeO benefit the loading of hollow FeO nanospheres. All of the composites as anodes for half cells show higher lithium storage capacities and better rate performances in comparison with spherical-graphite. The composite containing 39 wt% of hollow FeO nanospheres exhibits a high reversible capacity of 806 mAh g up to 200 cycles at 0.5 A g. When cycled at a higher current density of 2 A g, a high charge capacity of 510 mAh g can be sustained, even after 1000 long cycles. Meanwhile, its electrochemical performance for full cells was investigated. When matching with LiCoO cathode, its specific capacity can remain at 137 mAh g after 100 cycles. The outstanding lithium storage performance of the spherical-graphite/FeO composite may depend on the surface modification of high capacity hollow FeO nanospheres. This work indicates that the spherical-graphite/FeO composite is one kind of prospective anode material in future energy storage fields.
通过一种简单的两步合成策略成功制备了球形石墨/FeO复合材料。球形石墨与FeO之间的含氧官能团有利于中空FeO纳米球的负载。与球形石墨相比，所有作为半电池阳极的复合材料都表现出更高的锂存储容量和更好的倍率性能。含有39 wt%中空FeO纳米球的复合材料在0.5 A g下循环200次时表现出806 mAh g的高可逆容量。当在2 A g的更高电流密度下循环时，即使经过1000次长循环，仍可维持510 mAh g的高充电容量。同时，研究了其在全电池中的电化学性能。当与LiCoO阴极匹配时，100次循环后其比容量可保持在137 mAh g。球形石墨/FeO复合材料出色的锂存储性能可能取决于高容量中空FeO纳米球的表面改性。这项工作表明球形石墨/FeO复合材料是未来储能领域一种有前景的阳极材料。
