Study of metal hydride anode material in li-based batteries and halogenated anesthetic adsorption
University of New Brunswick
Gas adsorption and energy storage research (such as lithium ion (Li-ion) batteries and hydrogen storage) plays an important role in the climate change mitigation actions. In this thesis, hydrogen storage material (i.e., aluminum hydride) was synthesized and used as anode material in Li-ion batteries for the first time ever (to our knowledge). Different components, such as conductive carbon black (TIMREX® carbon P-Li) and polyvinylidene fluoride (PVDF) were added with different proportions to improve the performance of the electrode. Although the reaction is not very reversible (low delithiation capacity and short cycle life), capacities as high as 3226 mAh/g were achieved in the first discharge, which was still a very exciting result for researches studying Li-based battery and hydrogen storage material. Considering the high cost, high greenhouse potential (GWP) and low vivo metabolism in clinic use, the capture and recover halogenated ethers from the hospital operating room exhaust gas is not only an important environmental study, but also has great potential to bring huge economic benefits. Deltazite™ 6000 (D6000) is now commercially used by Blue Zone Technologies Ltd. for halogenated anesthetic adsorption and recovery. In search of a better adsorbent with higher adsorption capacity and to develop a more economical process, three types of adsorbent were tested to selectively capture and recycle halogenated anesthetic from the medical waste gas stream. A chromium-based metal organic framework (Cr-MOFs) MIL-101 and several aluminum-substituted mesoporous SBA-15 (Al-SBA-15) materials were synthesized, modified and characterized with respect to the textural, equilibrium and dynamic properties using sevoflurane (representative halogenated anesthetic) and water vapour as sorbates in the single component and mixture adsorption systems. Adsorption isotherms and breakthrough data were collected for both MIL-101 and Al-SBA-15 samples in comparison to the D6000 reference sample. With the much larger surface area and pore volume, MIL-101 sample demonstrated the highest adsorption capacity and the best selectivity for sevoflurane among all the tested adsorbents. Multiple-cycle breakthrough tests were also performed to examine the performance stability of adsorbents for the repeated operating and regeneration conditions. MIL-101 showed higher stability with lower sevoflurane capacity loss than the reference sample in multi-cycle adsorption experiments.