Royal Society of Chemistry;Royal Society of Chemistry (RSC)
摘要:
摘要： Ultrafine CuO nanoparticles are successfully encapsulated into two ordered mesoporous carbons (OMCs) with different pore architectures, namely CMK-8 with a 3D cubic mesostructure and CMK-3 with a 2D hexagonal mesostructure, and used as anodes in sodium-ion batteries. The electrochemical test results demonstrate that the CuOCMK-8 nanocomposite with ultra-small CuO nanoparticles (around 4 nm in diameter) and a high content of CuO (78%) exhibits superior electrochemical performance as compared to that of the CuOCMK-3 nanocomposite and the pristine CuO electrodes. The CuOCMK-8 anode delivers an initial discharge capacity of 1405 mA h g −1 with a reversible capacity of 768 mA h g −1 at a current density of 20 mA g −1 . At a current density of 100 mA g −1 , it provides a reversible capacity of 477 mA h g −1 after 200 cycles with coulombic efficiency over 99%. The remarkable enhancement of the electrochemical performance of the CuOCMK-8 nanocomposite can be attributed to the electrically conductive network of CMK-8 in the CuOCMK-8 nanocomposite wherein the ultra-small CuO nanoparticles supported on CMK-8 act as a synergistic elastic buffer. Furthermore, cyclic voltammetry, ex situ XRD, SEM and TEM measurements provide deeper insights to the reversible conversion reaction in the CuOCMK-8 nanocomposite system during the sodiation/desodiation process. The CuOCMK-8 anode exhibits an initial discharge capacity of 1405 mA h g −1 and a reversible capacity of 768 mA h g −1 in sodium-ion batteries. 出版者： Royal Society of Chemistry (RSC) 出版日期： 2016-01-01 出處： Journal of Materials Chemistry A, 2016-01, Vol.4 (37), p.14222-14233 資源來源： Royal Society of Chemistry 識別號： ISSN: 2050-7488 識別號： ISSN: 2050-7496 識別號： EISSN: 2050-7496 識別號： DOI: 10.1039/c6ta05238j
