Min-Seon Shin, Jung-Bae Park, and Sung-Man Lee*
Department of Nano Applied Engineering, Kangwon National University, Chuncheon, Gangwon-Do, 200-701, South Korea
The cycle performance of Ti-Si alloy anode material for Li-ion batteries has been
investigated as a function of loading level of electrode using a nodule type of substrate, in
which the current collector of flat foil is also used for comparison. The Ti-Si alloy powders
are prepared by mechanical alloying method. The electrodes with the nodule type of current
collector exhibit enhanced cycling performance compared to those using the flat foil because
the alloy particles are more strongly adhered to substrate and the stress caused by lithiation
and delithiation reaction can be effectively relaxed by nodule-type morphology. It appears, however,
that the cycle performance is critically dependent on the loading level of electrode, even
when the nodule type of current collector is applied. With high loading level, cracks are initiated
at surface of electrode due to a steep stress gradient through the electrode thickness
during cycling, leading to capacity fading.
Keyword : Si based alloys, Mechanical alloying, Current collector, Anode materials, Li-ion batteries