Sno2 and Tio2 / graphene oxide composites for applications in Li-ion batteries
International Conference on Nanoscience & Technology
May 21-22, 2018 | New York, USA
Universidad Complutense Madrid, Spain
Posters & Accepted Abstracts : Mater Sci Nanotechnol
Materials for lithium-ion battery (LIB) applications have become the topic for intensive research. Several oxidebased materials have been studied such as the graphitic carbons as anodes which are limited by a low theoretical capacity about 372 mAhÂ·g-1, and electrochemically active metal oxides CuO, SnO2, Fe3O4 or Co3O4 with high theoretical capacities ~1000 mAhÂ·g-1. One disadvantage is a large volume expansion and particle agglomeration during the lithiation/delithiation processes that lead to rapid degradation of the battery. Herein, we report the study of SnO2 and TiO2 nanoparticles and their composites with graphene oxide (GO) for applications as anodes in Li-ion batteries. Two chemical routes were used for the synthesis of nanoparticles in order to check its stability and effectiveness. One is the sol-gel method and the other one is the hydrolysis method. Capacity-cycle and capacity-voltage measurements have been performed in a coin cell type. SnO2 batteries show a high capacity in the charge/discharge process up to 100 cycles; however, TiO2 nanoparticles reveals a large stability in capacity terms up to 200 cycles, and finally an intermediate capacity for the GO/SnO2 composite that remains stable still in the 200th cycle, that can be used as a promising alternative anode material for LIBs.
Julio Ramirez-Castellanos works in the synthesis and structural/microstructural characterizations of new functional inorganic materials by high-resolution electron microscopy. Currently, he is professor at Complutense University, Madrid. He is coauthor of more than 100 reviewed scientific publications, 4 invention patents, and more than 100 communications to international conferences.