Credit: ACS Appl. Mater. Interfaces 6, 15140 (2014).
A series of (a) transmission electron microscope (TEM) images, (b) TEM diffraction patterns, and (c–e) electron energy-loss spectra demonstrating the thermal degradation of cathode materials made of lithium (Li), nickel (Ni), cobalt (Co), aluminum (Al), and oxygen (O) (LixNi0.8Co0.15Al0.05O2, referred to as NCA) during heating at high temperatures.