Employment of encapsulated Si with mesoporous TiO2 layer as
anode material for lithium secondary batteries
(1. Advanced Energy Materials Processing Laboratory, Korea Institute of Science and Technology,
P. O. Box 131, Cheongryang, Seoul, 130-650, Korea;
2. Department of Chemical & Bio Engineering, Kyungwon University, San 65 Bokjeong-Dong, Sujeong-Ku,
Seongnam, Gyeonggi-Do, 461-701, Korea)
P. O. Box 131, Cheongryang, Seoul, 130-650, Korea;
2. Department of Chemical & Bio Engineering, Kyungwon University, San 65 Bokjeong-Dong, Sujeong-Ku,
Seongnam, Gyeonggi-Do, 461-701, Korea)
Abstract: Silicon composite of nano-capsule type is newly applied as an active anode material for lithium ion batteries. TiO2-encapsulated silicon powders were synthesized by a sol-gel reaction with titanium ethoxide. Silicon nanoparticles were successfully embedded into porous titanium oxide capsules that played as a buffer layer against drastic volume changes of silicon during the charge-discharge cycling, consequently leading to the retardation of the capacity fading of intrinsic silicon materials. The electrochemical and structural properties of silicon nanocomposites with different surface areas of encapsulating TiO2 layer were characterized by X-ray diffraction(XRD), nitrogen gas adsorption analysis by the Brunauer-Emmett-Teller(BET) equation, transmission electron microscopy(TEM), and galvanostatic charge-discharge experiments.
Key words: sol-gel, TiO2, silicon, secondary battery