With the continuous improvement of the energy density of traction batteries for electric vehicles, the safety of batteries over their entire lifecycle has become the most critical issue in the development of electric vehicles. Abuse of electricity encountered in the application of batteries has a great impact on the safety of traction batteries. In this study, focused on the overdischarge phenomenon that is most likely to be encountered in the practical use of electric vehicles and grid storage, the impact of overdischarge on battery performance degradation is analyzed by neutron imaging technology and its safety hazards is systematically explored, combined with multimethods including electrochemical analysis and structural characterization. Results reveal the deterioration of the internal structure of traction batteries due to the overdischarge behavior and play a guiding role in the testing and evaluation of the safety of traction batteries.
Freestanding RuO2–Co3O4 nanowires on Ni foam were synthesized and applied as a cathode in Li–O2 battery. This cathode can deliver a high capacity of 9620 mA h g−1 and stable long-term operation exceeding 122 cycles at 100 mA g−1.
Lithium-ion traction batteries are increasingly use in transportation such as electric vehicles and buses. In order to reduce the life cycle cost of traction battery, material recycling is a technical route that must be considered. Deep-discharge is one of the necessary steps in the process of battery disassembly and material recycle, but the thermal stability and internal material changes caused by deep discharge will affect the subsequent recycle processes. In this paper, we study the influence of deep-discharge rate on recycle process of a commercial traction battery with LiNi1/3Co1/3Mn1/3O2 cathode and graphite anode. Combine with multi-analysis methods, the evolution of an electrode structure under different deep-discharge current densities is systematically studied. The results show that the deep-discharge current density will have different effects on the internal structure of the battery and will affect its thermal safety.
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