Zhan Fangming, Geng Baoyou, Guo Yijun
College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Laboratory of Molecular-Based Materials, Anhui Normal University, Wuhu, 241000, P.R. China.
Chemistry. 2009 Jun 15;15(25):6169-74. doi: 10.1002/chem.200802561.
In this work, we report the simple solid-state formation of porous Co3O4 with a hexagonal sheetlike structure. The synthesis is based on controlled thermal oxidative decomposition and recrystallization of precursor Co(OH)2 hexagonal nanosheets. After thermal treatment, the hexagonal sheetlike morphology can be completely preserved, despite the fact that there is a volume contraction accompanying the process: Co(OH)2-->Co3O4. Because of the intrinsic crystal contraction, a highly porous structure of the product is simultaneously created. Importantly, when evaluated as electrode materials for lithium-ion batteries, the as-prepared porous Co3O4 nanosheets exhibit superior Li-battery performance with good cycle life and high capacity (1450 mAh g(-1)) due to their porous sheetlike structure and small size. As far as we know, the performance of the Co3O4-based anode materials for lithium batteries presented here is the best up to now. Considering the improved performance and cost-effective synthesis, the as-prepared porous Co3O4 nanosheets might be suitable as anode electrodes for next-generation lithium-ion batteries.
在本工作中，我们报道了具有六方片状结构的多孔Co3O4的简单固态形成过程。该合成基于前驱体Co(OH)2六方纳米片的可控热氧化分解和重结晶。热处理后，尽管该过程伴随着体积收缩：Co(OH)2→Co3O4，但六方片状形态仍可完全保留。由于内在的晶体收缩，产物同时形成了高度多孔的结构。重要的是，当作为锂离子电池的电极材料进行评估时，所制备的多孔Co3O4纳米片由于其多孔片状结构和小尺寸，表现出优异的锂电池性能，具有良好的循环寿命和高容量（1450 mAh g(-1)）。据我们所知，此处展示的基于Co3O4的锂电池负极材料的性能是目前最好的。考虑到性能的提升和合成的成本效益，所制备的多孔Co3O4纳米片可能适合作为下一代锂离子电池的负极电极。
