Monitoring the formation of nickel-poor and nickel-rich oxide cathode materials for lithium-ion batteries with synchrotron radiation by Ying, B, Fitzpatrick, JR, Teng, Z, Chen, T, Lo, TWB, Siozios, V, Murray, CA, Brand, HEA, Day, S, Tang, CC, Weatherup, RS, Merz, M, Nagel, P, Schuppler, S, Winter, M, Kleiner, K