Toward a high-voltage fast-charging pouch cell with TiO2 cathode coating and enhanced battery safety. (May 2020) - Li, Yan
Abstract: Nickel-rich layered lithium transition metal oxides, LiNix Coy Mn1-x-y O2, are key cathode materials for high-energy lithium-ion batteries owing to their high specific capacity. However, the commercial deployment of nickel-rich oxides has been hampered by their poor thermostability and insufficient cycle life. Here full batteries with uncoated and TiO2 -coated LiNi0.5 Co0.2 Mn0.3 O2 cathodes and graphite anodes are compared in terms of electrochemical performance and safety behavior. The battery using a TiO2 -coated LiNi0.5 Co0.2 Mn0.3 O2 cathode exhibited better cyclic performance at high cutoff voltage. Electrochemical impedance spectroscopy analysis indicated that the TiO2 -coated LiNi0.5 Co0.2 Mn0.3 O2 cathode gave the battery a more stable charge transfer resistance. Transmission electron microscopy demonstrated that TiO2 coating reduced accumulation of the cathode electrolyte interface layer on the particle surface. Time-of-flight secondary ion mass spectrometry demonstrated that TiO2 coating markedly enhanced the interface stability of the cathode particle and protected the particle from serious etching by the electrolyte. Accelerating rate calorimetry revealed that the trigger temperature of thermal runaway for the battery using TiO2 -coated LiNi0.5 Co0.2 Mn0.3 O2 as cathode material was 257 °C, which was higher than that of the battery with the uncoated LiNi0.5 Co0.2 Mn0.3 O2 cathode (251 °C). In situ X-ray diffraction during heating demonstrated that this enhanced safety can be attributed to the suppressed phase evolution of the coated cathode material. Graphical abstract: Image 1 Highlights: TiO2 coating can improve electrochemical performance at high cutoff voltage. TiO2 coating can restrain the side reactions on the particle surface. TiO2 coating can postpone phase transformation during heating. TiO2 coating can improve battery safety at high cutoff voltage.