resumo
In this manuscript, we introduce a facile hydrothermal method for the controlled growth of SnO2 nanoparticles onto graphene oxide. Hydrazine plays a fundamental role in controlling the formation and crystallization of SnO2 nanoparticles, and the reduction of graphene oxide to graphene. The SnO2-graphene composite consists of 3-4 nm monodisperse SnO2 nanocrystals homogeneously dispersed at the surface of graphene. It is demonstrated that the composite can accommodate the large volume change of SnO2 which occurs during lithiation-delithiation cycles. When used as an anode material for lithium ion batteries, it exhibits a first discharge capacity of 1662 mA h g(-1), which rapidly stabilizes and still remains at 626 mA h g(-1) even after 50 cycles, when cycled at a current density of 100 mA g(-1). Even at the very high current density of 3200 mA g(-1), the composite displays a stable capacity of 383 mA h g(-1) after 50 cycles.
palavras-chave
GRAPHITE OXIDE; ANODE MATERIAL; HIGH-CAPACITY; TIN OXIDE; AQUEOUS DISPERSIONS; STORAGE PROPERTIES; COMPOSITE; ELECTRODE; PERFORMANCE; ENCAPSULATION
categoria
Chemistry; Materials Science
autores
Park, SK; Yu, SH; Pinna, N; Woo, S; Jang, B; Chung, YH; Cho, YH; Sung, YE; Piao, Y
nossos autores
Nicola Pinna
InvestigadorGrupos
agradecimentos
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 2011-0025391) and partial support from the Korea Research Council of Fundamental Science and Technology (KRCF) through the project of 'Development of Characterization Techniques for Nano-materials Safety'. YES acknowledges financial support from the National Research Foundation of Korea Grant funded by the Korean Government (MEST) (NRF-C1AAA001-2010-0029065). Yong-Hun Cho acknowledges financial support by the Priority Research Centers Program through NRF funded by MEST (2009-0093814).