As lithium-ion batteries evolve toward higher cell voltage and capacity, developing detailed knowledge of the electrolyte-electrode interface is critically important. While there is general agreement on solid electrolyte interphase (SEI) formation on graphitic anodes, clear evidence of passivation at the cathode interface remains elusive. This presentation discusses our efforts in investigating the interphases in Li ion batteries, on both cathodes and anodes. Primarily using in-situ electrochemical atomic force microscopy (EC-AFM) and confocal Raman spectroscopy, our studies focus on the live-formation of electrolyte-cathode interphases.