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Li-rich thin film cathode prepared by pulsed laser deposition
Binggong Yan1, Jichang Liu, Bohang Song
11] State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, P.R. China 410082 [2] Department of Mechanical Engineering National University of Singapore, Singapore 117576.
Abstract:
Li-rich layer-structured cathode thin films are prepared by pulsed laser deposition. X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), X-ray photoelectron spectroscopy (XPS) and electrochemical testing in half battery cells are used to characterize crystal structure, surface morphology, chemical valence states and electrochemical performance of these thin films, respectively. It is observed that partial layer to spinel transformation takes place during post annealing, and the layered structure further gradually transforms to spinel during electrochemical cycling based on the analysis of dQ/dV. Electrochemical measurement shows that the thin film electrode deposited at 350 mTorr and post-annealed at 800 °C possesses the best performance.
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