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Separator Dependency on Cycling Stability of Lithium Metal Batteries Under Practical Conditions

Energy & Environmental Materials 2023年第5期6卷 307-316页

作者： Hyeongguk An Youngjoon Roh Youngseong Jo Hyuntae Lee Minhong Lim Mingyu Lee Yong Min Lee Hongkyung Lee Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology DGIST333 Techno Jungang-daeroDaegu 42988Korea Energy Science and Engineering Research Center Daegu Gyeongbuk Institute of Science and Technology(DGIST)333 Techno Jungang-daeroDaegu 42988Korea

Development of practical lithium(Li)metal batteries(LMBs)remains challenging despite promises of Li metal anodes(LMAs),owing to Li dendrite formation and highly reactive surface *** separators used in LMBs may undergo severe mechanical and chemical deterioration when contacting with *** identify the best polyolefin separator for LMBs,this study investigated the separator-deterministic cycling stability of LMBs under practical conditions,and redefined the key influencing factors,including pore structure,mechanical stability,and chemical affinity,using 12 different commercial separators,including polyethylene(PE),polypropylene(PP),and coated *** extreme compression triggered by LMA swelling,isotropic stress release by balancing the machine direction and transverse direction tensile strengths was found to be crucial for mitigating cell *** of PP separators,a PE separator that possesses a high elastic modulus and a highly connected pore structure can uniformly regulate LMA *** ceramic coating reinforced short-circuiting resistance,while the cycling efficiency degraded rapidly owing to the detrimental interactions between ceramics and *** study identified the design principle of separators for practical LMBs with respect to mechanical stability and chemical affinity toward LMAs by elucidating the impacts of separator modification on the cycling performance.

关键词： chemical inertness lithium metal batteries mechanical strength polyolefin separators short-circuiting

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The Choice of Appropriate Scenario in Order to Reduce the Effect of Thermal Pollution at the Damietta Branch Caused by Cooling Water Discharged from Kafr-Al-Batek Power Station

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Journal of Environmental Protection 2015年第8期6卷 857-866页

作者： Saadeldin K. Mostafa Mohamed K. Mostafa Jason T. Kirby Department of Civil Construction and Environmental Engineering at University of Alabama at Birmingham Birmingham AL USA

The main purpose of this research effort was to investigate and reduce the volume of thermal polluted cooling water from returning to the Kafr-Al-Batek power station. Traditional cooling systems, such as cooling towers or ponds can be very challenging with regards to implementation in developing countries;mainly due to the lack of financial capacity. This research focused on low-cost simulation solutions that could improve thermal outcomes. Comparisons were performed between three different scenarios to decrease the elevated temperature of the discharged water (43 °C) released by the Kafr-Al-Batek power station on the Damietta branch. The different scenarios were simulated by using Star CCM+ software. The base scenario examined the discharge angle of an existing outlet. The second scenario examined a new outlet downstream from the existing outlet. The third scenario increased the width of the existing outlet in order to reduce flow velocity. A comparative analysis is provided between the aforementioned solutions to identify the most suitable and cost-effective alternative. Simulation results show that changing the discharge angle from 90° to 135° is the most effective solution. Applying this solution has the potential to decrease the water temperature at the inlet by 7 degrees Celsius (from 32 °C to 25 °C).

关键词： Thermal Pollution short-circuiting CFD Software Kafr-Al-Batek Power Station Damietta Branch Egypt

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