Li-Ion Storage Performance of Carbon-Coated Mn–Al–O Composite Oxides

Autor:	Yong-Xin Qi, Gui-Xia Lu, Hui-Ling Zhu, Ning Lun, Cheng Wei, Yu-Jun Bai, Yunkai Sun, Ning Zhao, Tao Li
Rok vydání:	2014
Předmět:	Materials science Coprecipitation Metallurgy Composite number Sintering Conductivity Electrochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Chemical engineering Particle size Physical and Theoretical Chemistry Dispersion (chemistry) Current density
Zdroj:	The Journal of Physical Chemistry C. 118:23559-23566
ISSN:	1932-7455 1932-7447
Popis:	The composites of manganese oxide and alumina (Mn–Al–O) with varied Mn/Al molar ratios were fabricated by a simple coprecipitation method and subsequently sintered at different temperatures. Carbon-coated oxides were prepared at 550 °C using pyrrole as the carbon source. Compared with the carbon-coated MnO prepared under the same conditions, the carbon-coated Mn–Al–O exhibits greatly enhanced electrochemical performance which is associated with both the Mn/Al molar ratio and sintering temperature. The carbon-coated composites with a ratio of 2:1 sintered at 600 °C could deliver a stable reversible capacity of 450 mAh g–1 after 100 cycles at a current density of 100 mA g–1 and the capacities of 373, 309, 245, and 175 mAh g–1 at the densities of 200, 400, 800, and 1600 mA g–1, respectively. The enhanced cycling and rate performance is attributed to the improved Li-ion conductivity owing to the formation of LiAlO2 and the smaller particle size of MnO due to the dispersion effect of Al2O3.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d5a88081f491d99f0e4bd5e8cc31afa9 https://doi.org/10.1021/jp507728z Zobrazit plný text záznamu