Toward a high-voltage fast-charging pouch cell with TiO2 cathode coating and enhanced battery safety
| Autor: | Ruihe Li, Hungjen Hsu, Xuning Feng, Junxian Hou, Ouyang Minggao, Li Wang, Yan Li, Khalil Amine, Wenqian Xu, Languang Lu, Gui-Liang Xu, Xiang Liu, Dongsheng Ren, Xiangming He, Yang Ren |
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| Rok vydání: | 2020 |
| Předmět: |
Battery (electricity)
Materials science Thermal runaway Renewable Energy Sustainability and the Environment chemistry.chemical_element 02 engineering and technology Electrolyte engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences law.invention Dielectric spectroscopy chemistry Coating law engineering General Materials Science Lithium Electrical and Electronic Engineering Composite material 0210 nano-technology |
| Zdroj: | Nano Energy. 71:104643 |
| ISSN: | 2211-2855 |
| Popis: | Nickel-rich layered lithium transition metal oxides, LiNixCoyMn1-x-yO2, 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 LiNi0.5Co0.2Mn0.3O2 cathodes and graphite anodes are compared in terms of electrochemical performance and safety behavior. The battery using a TiO2-coated LiNi0.5Co0.2Mn0.3O2 cathode exhibited better cyclic performance at high cutoff voltage. Electrochemical impedance spectroscopy analysis indicated that the TiO2-coated LiNi0.5Co0.2Mn0.3O2 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 LiNi0.5Co0.2Mn0.3O2 as cathode material was 257 °C, which was higher than that of the battery with the uncoated LiNi0.5Co0.2Mn0.3O2 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. |
| Databáze: | OpenAIRE |
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