Improvement the electrochemical performance of Li1.2Ni0.2Mn0.6O2 electrode with AlF3 added

Layered solid solution material Li_1.2Ni_0.2Mn_0.6O₂ is synthesized and the AlF₃ is added to improve the electrochemical performance. X-ray diffraction (XRD) results show that the Li_1.2Ni_0.2Mn_0.6O₂ samples exhibit layered characteristics. The AlF₃ additive is detected by transmission electron microscope (TEM) technology. The electrochemical tests show that Li_1.2Ni_0.2Mn_0.6O₂ electrode with AlF₃ added delivers better discharge capacity (240mA· h/g), first coulomb efficiency 79.2%, cyclic performance (capacity retention ratio of 100.6% after 50 cycles), and rate capacity (68mA · h/g at 10 capacity (C)) than the pristine sample. Electrochemical impedance spectroscopy (EIS) results show that the charge transfer resistance of Li_1.2Ni_0.2Mn_0.6O₂ electrode with AlF₃ added increases slower than that of pristine Li_1.2Ni_0.2Mn_0.6O₂ after cycling, which is responsible for better cyclic and rate performance.     

基于路谱的动力电池六轴仿真振动测试研究

动力电池体积远大于传统的汽车零部件,电池上某一个点的运动状态无法代表其在车辆行驶过程中的实际运动状态。本文通过计算动力电池安装点载荷的自功率谱、伪损伤谱以及不同载荷谱间的频响函数,分析了动力电池不同安装点在实车行驶过程中位所受激励的差异性,找到了目前动力电池单轴振动试验的局限性,并通过试验发现六轴仿真振动可以较好地弥补该局限性。