Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, China.
Nanoscale. 2013 Jul 21;5(14):6338-43. doi: 10.1039/c3nr00380a. Epub 2013 Jun 12.
Graphene-wrapped FeF3 nanocrystals (FeF3/G) have been successfully fabricated for the first time by a vapour-solid method, which can be generalized to synthesize other metal fluorides. The as-synthesized FeF3/G delivers a charge capacity of 155, 113, and 73 mA h g(-1) at 104, 502, and 1040 mA g(-1) in turn, displaying superior rate capability to bare FeF3. Moreover, it exhibits stable cyclability over 100 cycles with a charge capacity of 185.6 and 119.8 mA h g(-1) at 20.8 and 208 mA g(-1), respectively, which could be ascribed to the buffering effect and lowered resistance from the graphene. This versatile vapour-solid method and the improved cyclability provide a promising avenue for the application of metal fluorides as cathode materials.
石墨烯包裹的 FeF3 纳米晶体（FeF3/G）首次通过气相固相反方法成功合成，该方法可以推广到其他金属氟化物的合成。所合成的 FeF3/G 在 104、502 和 1040 mA g(-1) 的电流密度下分别提供了 155、113 和 73 mA h g(-1) 的充电容量，表现出优于 bare FeF3 的倍率性能。此外，它在 20.8 和 208 mA g(-1) 的电流密度下分别具有 185.6 和 119.8 mA h g(-1) 的稳定循环性能，经过 100 次循环后容量保持率仍高达 90.7%，这归因于石墨烯的缓冲效应和降低的电阻。这种多功能气相固相反方法和提高的循环稳定性为金属氟化物作为阴极材料的应用提供了有前景的途径。
