11. D. F. Kong^, J. T. Hu^, Z. F. Chen, K. P. Song, C. Li, M. Y. Weng, M. F. Li, R. Wang, T. C. Liu, J. J. Liu, M. J. Zhang,* Y. G. Xiao,* F. Pan*, "Ti-Gradient Doping to Stabilize Layered Surface Structure for High Performance High-Ni Oxide Cathode of Li-Ion Battery", Adv. Energy Mater. 2019, 1901756.