Can boron improve the cycle life of silicon-based lithium-ion battery anodes?
Stabilizing the solid electrolyte interphase (SEI) remains a key challenge for silicon-based lithium-ion battery anodes. Alloying silicon with secondary elements like boron has emerged as a promising strategy to improve the cycle life of silicon anodes, yet the underlying mechanism remains unclear.
Can boron be used to make a silicon nanoparticle?
Silicon doped or alloyed with boron (BSi) is particularly interesting. Boron improves electrical conductivity in silicon, which improves rate capability for cycling. In single nanometer-scale BSi, interfacial dipoles and dative bonding change the electrostatic landscape and enable molecular control at the nanoparticle surface.
How can boron/silicon nanoparticles be synthesized using plasma-enhanced chemical vapor deposition?
This study introduces an innovative approach by alloying silicon with boron, creating boron/silicon (BSi) nanoparticles synthesized via plasma-enhanced chemical vapor deposition. These nanoparticles exhibit altered electronic structures as evidenced by optical, structural, and chemical analysis.
Is boron incorporated into crystalline silicon lattice?
From XRD (Figure S2), a 0.5% contraction of the diamond cubic structure─as measured by an increase in 2θ of the (111) diffraction peak, compared to pure Si NPs─confirms the incorporation of boron into the crystalline silicon lattice as well as the surface.
Does boron concentration affect battery performance?
To address this knowledge gap, how boron concentration influences battery performance is systematically investigated. These results show a near-monotonic increase in cycle lifetime with higher boron content, with boron-rich electrodes significantly outperforming pure silicon.
Does silicon boron alloy have the same lithiation mechanism as Si?
Differential capacity (dQ/dV) curves of the second and third cycle for samples Si-B0||Li and Li 2 CO 3 @Si-B25||Li, provided in Figure S3 (Supporting Information), suggests that the silicon boron alloy has the same lithiation mechanism as Si, albeit with a slight increase in the overpotential. This behavior is consistent with our previous report.
The Origin of Improved Performance in Boron
Alloying silicon with secondary elements like boron has emerged as a promising strategy to improve the cycle life of silicon anodes, yet the underlying mechanism remains unclear.
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