改进的碳热还原法合成lifepo4c材料.pdf

Trans. Nonferrous Met. Soc. China 22(2012) 613−620
 
 
Synthesis and electrochemical properties of highly dispersed Li4Ti5O12
nanocrystalline for lithium secondary batteries

WANG Jin 1, 2, LIU Xiao-min1, YANG Hui2

1. College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China;
2. National Engineering Research Center for Nanotechnology, Shanghai 200241, China

Received 23 March 2011; accepted 23 November 2011


Abstract: A sol−gel method using lauric acid as surfactant was used to synthesize Li4Ti5O12 nanocrystals with an ultra-fine particle
size distribution between 120 and 250 nm. In order to obtain the electrode materials with the best electrochemical performance, the
content of lauric acid during Li4Ti5O12 synthesis was systematically studied. The physical and electrochemical properties of the
synthesized samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM),
transmission electron microscopy (TEM), laser particle size analysis, alternating current impedance (AC) and galvanostatic
charge-discharge experiments. The highly dispersed Li4Ti5O12 nanocrystals obtained at 800 °C for 10 h can deliver a specific capacity
of mA·h/g at 1C rate without obvious capacity fade up to 50 cycles. The results suggest that well dispersed Li4Ti5O12
n