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Magnetic field-governed kinetics in a silicon dioxide-based anode towards high performing lithium-ion magneto-batteries
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Date: Tuesday, 19th November 2024
Time: 12:00pm – 1:00pm (AEDT)
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Magnetic field-governed kinetics in a silicon dioxide-based anode towards high performing lithium-ion magneto-batteries
Due to low intrinsic electrical conductivity, sluggish electrode kinetics occur in silicon dioxide (SiO2) as an anode material, which along with its low initial coulombic efficiency (CE) restrict its use in lithium-ion batteries (LIBs). Herein, a magnetic field is employed within the cell to control the magnetoresistance of the SiO2 electrode, which not only enhances the overall performance but also improved the initial CE. In this regard, a chemical vapor deposition technique is used to deposit in situ SiO2 on the copper foil substrate, which is used directly to assemble a battery cell under a magnetic field. Although SiO2 is not a magnetic material, defects in SiO2 behave like a nano magnet under an applied magnetic field, which reduces scattering and random movement of charge carriers and aligns them towards conductive channels within the materials. As a result, charge carriers obtained from lithium-ions (Li+) on the anode surface travel through conductive channels due to which promising battery performance is observed. First, the SiO2/Cu electrode is used as an anode under different magnitudes of magnetic field (i.e., 800–2400 gauss) and an improvement in the initial CE but a lower negative magnetoresistance was observed. To increase the negative magnetoresistance of SiO2/Cu, in situ carbon is also coated, which offers an exceptional initial CE ∼ 96%, an excellent capacity retention even after long-term cycling for 1000 cycles (i.e., 2050 mA h g−1 at 100 mA g−1) and a commendable high-rate capability (i.e., 891 mA h g−1 at 2 A g−1). No doubt, the obtained findings are critical to developing high performing battery systems by coupling magnetoresistance with electrode kinetics.
Rizwan Ur Rehman Sagar completed his PhD (2010–2015) degree in Materials Science and Engineering, Tsinghua University, Beijing, China. He has been served as post-doctorate fellow (2016-2018) in College of Materials Science and Engineering, Shenzhen University. During that period, he was awarded research funding from Postdoctoral Science Foundation of China (No.2016M592531). In addition, he has been selected as an excellent postdoctoral (2018-2020) young fellow at Tsinghua Shenzhen International Graduate School, Shenzhen, China and obtain a prestigious research funding from the National Natural Science Foundation (52050410344, and 11850410427) as Principal Investigator. He served Jiangxi University of Science and Technology, Ganzhou, as Associate Research Professor and nominated as honorary citizen of Ganzhou city and got prestigious award of Foreign Research Expert (QNJ2021022001) in China-2022.
He is actively engaged in the fabrication of low-dimensional materials and detected interesting physical phenomena involved therein. He has been published more than 70 scientific articles in well-reputed journals and now serving as an Associate Editor in different journals especially Nanoscience-Frontiers in Chemistry. Recently, he is working on the advance cutting-edge battery technology in IFM-Deakin University Waurn Ponds.