Facile synthesis of two-dimensional carbon/Si composite assembled by ultrasonic atomization-assisted-ice template technology as electrode for lithium-ion battery

Liang, Bo; Tan, Wei; Chen, Menghao; Yi, Maoyu; Hu, Jianghuai; Zeng, Ke; Wang, Yuechuan; Li, Yanjun; Yang, Gang

doi:10.1016/j.jallcom.2023.173030

Cited by 5 publications

(1 citation statement)

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“…The reduction peak near 0.16 V at Si@Sn@C and Si@void@C can be attributed to the formation of a Li-Si alloy by Li + and Si nanoparticles. The oxidation peaks at 0.36/0.34 V and 0.54/0.517 V correspond to the dealloying of the Li-Si alloy [ 43 ] in Si@Sn@C/Si@void@C. In the initial few cycles, the intensity of the reduction and oxidation peaks gradually increases with the progress of the cycle, resulting from the gradual electrochemical activation processes of the electrode. Unlike the Si@void@C anode, a reduction peak can be observed at 0.36 V in the CV curve of Si@Sn@C, which can be attributed to the formation of a Li-Sn alloy.…”

Section: Resultsmentioning

confidence: 99%

Simple and Safe Synthesis of Yolk-Shell-Structured Silicon/Carbon Composites with Enhanced Electrochemical Properties

Li,

Wu,

et al. 2024

Molecules

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With its substantial theoretical capacity, silicon (Si) is a prospective anode material for high-energy-density lithium-ion batteries (LIBs). However, the challenges of a substantial volume expansion and inferior conductivity in Si-based anodes restrict the electrochemical stability. To address this, a yolk-shell-structured Si–carbon composite, featuring adjustable void sizes, was synthesized using tin (Sn) as a template. A uniform coating of tin oxide (SnO2) on the surface of nano-Si particles was achieved through a simple annealing process. This approach enables the removal of the template with concentrated hydrochloric acid (HCl) instead of hydrofluoric acid (HF), thereby reducing toxicity and corrosiveness. The conductivity of Si@void@Carbon (Si@void@C) was further enhanced by using a high-conductivity carbon layer derived from pitch. By incorporating an internal void, this yolk-shell structure effectively enhanced the low Li+/electron conductivity and accommodated the large volume change of Si. Si@void@C demonstrated an excellent electrochemical performance, retaining a discharge capacity of 735.3 mAh g−1 after 100 cycles at 1.0 A g−1. Even at a high current density of 2.0 A g−1, Si@void@C still maintained a discharge capacity of 1238.5 mAh g−1.

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Section: Resultsmentioning

confidence: 99%