resumo
A one-pot template-free solvothermal synthesis of crystalline Li(4)Ti(5)O(12) nanostructures based on the "benzyl alcohol route'' is introduced. The 1-2 mu m sized nanostructured spherical particles are constituted of nanocrystallites in the size range of a few nm. This is the first report showing that crystalline Li(4)Ti(5)O(12) can be directly obtained by soft chemistry solution routes. The as-synthesized crystalline nanostructures show good lithium intercalation/deintercalation performances at high rates (up to 30 C) and good cycling stabilities. Annealing the nanostructures at 750 degrees C improves the performance, which approaches the theoretical capacity of Li(4)Ti(5)O(12) with no noticeable (less than 5%) capacity loss after 200 cycles.
palavras-chave
SOL-GEL ROUTES; ELECTROCHEMICAL PROPERTIES; NANOCRYSTALLINE LI4TI5O12; NEGATIVE ELECTRODE; ANODE MATERIAL; LI-INSERTION; SPINEL; NANOPARTICLES; NANOMATERIALS; PERFORMANCE
categoria
Chemistry; Materials Science
autores
Yu, SH; Pucci, A; Herntrich, T; Willinger, MG; Baek, SH; Sung, YE; Pinna, N
nossos autores
Nicola Pinna
InvestigadorGrupos
Projectos
Nanotubes and Nanowires based hybrid nanostructures (PTDC/CTM/098361/2008)
Hierarchical Nanostructures for Lithium-Ion Batteries (PTDC/CTM-NAN/110776/2009)
RMNE-UA-National Network of Electron Microscopy (REDE/1509/RME/2005 )
agradecimentos
This work was partially supported by WCU (World Class University) program through the National Research Foundation (NRF) of Korea funded by the Ministry of Education, Science and Technology (R31-10013) and the NRF grant (NRF-C1AAA001-2010-0029065), and FCT projects (PTDC/CTM/098361/2008), (PTDC/CTM-NAN/110776/2009) and (REDE/1509/RME/2005). NP acknowledges Dr F. Favier for fruitful discussion.