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Anode Properties of Cr _x V_1-x Si₂/Si Composite Electrodes for Lithium-Ion Batteries.

ABSTRACT: We have reported the effects of substituting a transition metal in silicide on the electrochemical performance of the silicide/Si composite anode for lithium-ion batteries (LIBs); the Cr_0.5V_0.5Si₂/Si electrode exhibited much better cyclability compared with CrSi₂/Si and VSi₂/Si electrodes. Herein, we investigated the electrochemical performance of a Cr _x V_1-x Si₂/Si slurry electrode for its application in LIBs, and the results obtained were compared to those of a gas deposition (GD) electrode, which was comprised of only active materials. The slurry electrode exhibited a superior cycling life as with the GD electrode. After charge-discharge cycles, the expansion of the electrode thickness of CrSi₂/Si and Cr_0.5V_0.5Si₂/Si was smaller than that of VSi₂/Si, and VSi₂ was significantly pulverized compared with the other silicides. It is considered that VSi₂ deformed easily by the stress from Si expansion and pulverized because the hardness of VSi₂ was the smallest among the silicides used in this study. These results reveal that Cr_0.5V_0.5Si₂/Si has great potential as an anode material for next-generation LIBs and hardness is an important property for compositing silicide with Si.

SUBMITTER: Kimura Y

PROVIDER: S-EPMC8028021 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Bagasse-derived carbon electrodes were developed by doping with nitrogen functional groups and compositing with high-capacity MnO2 nanoparticles (MnO2/NBGC). The bagasse-derived biochar was N-doped by refluxing in urea, followed by the deposition of MnO2 nanoparticles onto its porous surface via the hydrothermal reduction of KMnO4. Different initial KMnO4 loading concentrations (i.e. 5, 10, 40, and 100 mM) were applied to optimize the composite morphology and the corresponding electrochemical performance. Material characterization confirmed that the carbon composite has a mesoporous structure along with the dispersion of MnO2 nano-particles on the N-containing carbon surface. It was found that the 5-MnO2/NBGC sample exhibited the highest electrochemical performance with a reversible capacity of 760 mA h g-1 at a current density of 186 mA g-1. It delivered reversible capacities of 488 and 390 mA h g-1 in cycle tests at 372 and 744 mA g-1, respectively, for 150 cycles and presented good reversibility with nearly 100% coulombic efficiency. In addition, it could exert high capacities up to 388 and 301 mA h g-1 even under high current densities of 1860 and 3720 mA g-1, respectively. Moreover, most of the prepared composite products showed high rate capability with great reversibility up to more than 90% after testing at a high current density of 3720 mA g-1. The great electrochemical performance of the MnO2/NBGC nanocomposite electrode can be attributed to the synergistic impact of the hierarchical architecture of the MnO2 nanocrystals deposited on porous carbon and the capacitive effect of the N-containing defects within the carbon material. The nanostructure of the MnO2 particles deposited on porous carbon limits its large volume change during cycling and promotes good adhesion of MnO2 nanoparticles with the substrate. Meanwhile, the capacitive effect of the exposed N-functional groups enables fast ionic conduction and reduces interfacial resistance at the electrode interface.

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Anode Properties of Cr _x V_1-x Si₂/Si Composite Electrodes for Lithium-Ion Batteries.

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