RESUMO
In this work, a few-layer MXene is prepared and sprinkled on a commercial polypropylene (PP) separator by a facile spraying method to enhance the electrochemistry of the Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode. Scanning electron microscope (SEM) and X-ray diffraction (XRD) are used to characterize the morphology and structure of MXene. Fourier transform infrared spectroscopy (FT-IR) and a contact angle tester are used to measure the bond structure and surface wettability PP and MXene/PP separator. The effect of the MXene/PP separator on the electrochemical performance of ternary NCM811 material is tested by an electrochemical workstation. The results show that the two-dimensional MXene material could improve the wettability of the separator to the electrolyte and greatly enhance the electrochemical properties of the NCM811 cathode. During 0.5 C current density cycling, the Li/NCM811 cell with MXene/PP separator remains at 166.2 mAh/g after the 100 cycles with ~90.7% retention. The Rct of MXene/PP cell is measured to be ~28.0 Ω. Combining all analyses results related to MXene/PP separator, the strategy by spraying the MXene on commercial PP is considered as a simple, convenient, and effective way to improve the electrochemical performance of the Ni-rich NCM811 cathode and it is expected to achieve large-scale in high-performance lithium-ion batteries in the near future.
RESUMO
Objective To explore the effect of aerobic exercise training on artery elasticity among patients with essential hypertension.Methods A total of 155 cases of patients with essential hypertension (EH)were selected,and were divided into control group(76 cases)and aerobic exercise group(79 cases).Control group was follow routine drug therapy,and aerobic exercise group was follow aerobic exercise training besides the routine therapy for 12 weeks.CAVI,ABI values,limb blood pressure,TG,TC,LDL -C,HDL -C and U -MA were compared before and after the intervention.Results After the intervention,bilateral CAVI values of aerobic exercise group were 7.76 ±0.15,7.88 ±0.15,8.87 ±0.25 and 8.89 ± 0.22,and lower than those before the intervention(P <0.05).The decline range of bilateral CAVI value(the difference between the mean differences before and after the intervention)were 1.03 ±0.07 and 1.03 ±0.06,significantly wider than the control group of 0.33 ±1.97 and 0.15 ±0.08(P <0.05).After the intervention,limb systolic pressure,diastolic blood pressure and triglyceride,cholesterol decreased in the aerobic exercise group(P <0.05).The limb systolic blood pressure and left limb diastolic blood pressure decreased in the control group after intervention (P <0.05),but the decline range was smaller than the aerobic exercise group(P <0.05 ).Conclusion The aerobic exercise training could significantly improve arterial elasticity among patients with essential hypertension.
