Lithium-ion batteries (LIB) are widely used for daily products in our life, such as hybrid cars, cell phone, etc. but their charge/discharge process is not fully understood yet. To understand the process, behaviors of lithium ion, distribution and chemical composition and state, should be revealed. A research group in the Institute for Molecular Science observed that scanning transmission X-ray microscope (STXM) can be a powerful technique to perform X-ray absorption spectroscopy (XAS) with high spatial resolution.