Issue 35, 2024

Magnetic field-governed kinetics in a silicon dioxide-based anode towards high performing lithium-ion magneto-batteries

Abstract

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 were 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.

Graphical abstract: Magnetic field-governed kinetics in a silicon dioxide-based anode towards high performing lithium-ion magneto-batteries

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Article information

Article type
Paper
Submitted
24 মে 2024
Accepted
25 জুলাই 2024
First published
26 জুলাই 2024

J. Mater. Chem. A, 2024,12, 23601-23611

Magnetic field-governed kinetics in a silicon dioxide-based anode towards high performing lithium-ion magneto-batteries

R. U. Rehman Sagar, S. Mateti, N. Mahmood, M. W. Khan, Y. (. Chen and M. M. Rahman, J. Mater. Chem. A, 2024, 12, 23601 DOI: 10.1039/D4TA03612C

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