Cheng Wei, Rechberger Felix, Ilari Gabriele, Ma Huan, Lin Wan-Ing, Niederberger Markus
Laboratory for Multifunctional Materials , Department of Materials , ETH Zurich , Vladimir-Prelog-Weg 5 , 8093 Zurich , Switzerland . Email:
Electron Microscopy Center , Empa , Swiss Federal Laboratories for Materials Science and Technology , Überlandstrasse 129 , 8600 Dübendorf , Switzerland.
Chem Sci. 2015 Dec 1;6(12):6908-6915. doi: 10.1039/c5sc02525g. Epub 2015 Aug 26.
During the past decade, tremendous attention has been given to the development of new electrode materials with high capacity to meet the requirements of electrode materials with high energy density in lithium ion batteries. Very recently, cobalt silicate has been proposed as a new type of high capacity anode material for lithium ion batteries. However, the bulky cobalt silicate demonstrates limited electrochemical performance. Nanostructure engineering and carbon coating represent two promising strategies to improve the electrochemical performance of electrode materials. Herein, we developed a template method for the synthesis of amorphous cobalt silicate nanobelts which can be coated with carbon through the deposition and thermal decomposition of phenol formaldehyde resin. Tested as an anode material, the amorphous cobalt silicate nanobelts@carbon composites exhibit a reversible high capacity of 745 mA h g at a current density of 100 mA g, and a long life span of up to 1000 cycles with a stable capacity retention of 480 mA h g at a current density of 500 mA g. The outstanding electrochemical performance of the composites indicates their high potential as an anode material for lithium ion batteries. The results here are expected to stimulate further research into transition metal silicate nanostructures for lithium ion battery applications.
在过去十年中，人们对开发具有高容量的新型电极材料给予了极大关注，以满足锂离子电池中高能量密度电极材料的要求。最近，硅酸钴被提议作为一种新型的锂离子电池高容量负极材料。然而，块状硅酸钴的电化学性能有限。纳米结构工程和碳包覆是提高电极材料电化学性能的两种有前景的策略。在此，我们开发了一种模板法来合成非晶态硅酸钴纳米带，该纳米带可通过酚醛树脂的沉积和热分解包覆碳。作为负极材料测试时，非晶态硅酸钴纳米带@碳复合材料在电流密度为100 mA g时表现出745 mA h g的可逆高容量，在电流密度为500 mA g时具有长达1000次循环的长寿命，容量保持稳定在480 mA h g。复合材料出色的电化学性能表明它们作为锂离子电池负极材料具有很高的潜力。这里的结果有望激发对用于锂离子电池应用的过渡金属硅酸盐纳米结构的进一步研究。
