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Chemical Engineering Journal

Chemical Engineering Journal

IF: 13.3
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Exposure of functional group from hyperbranched precursor to arrange SiOC phase for lithium-ion batteries

Published:3 December 2024 DOI: 10.1016/j.cej.2024.158270
Quanhui Wu, Pengfei Wu, Huibin Tu, Sen Mi, Zhenpu Zhang, Keyan Song, Anhua Liu

Abstract

Polymer-derived silicon oxycarbide (SiOC) ceramics are promising anode materials for lithium-ion batteries due to their high theoretical capacity. However, controlling their structure and composition during pyrolysis is challenging. This study employs chemical methods to construct hyperbranched polysiloxane precursors, exposing varying amounts of Si–OH groups to regulate Si–C and Si–O rearrangement. The resulting SiOC ceramics exhibit high reversible phase contents and improved electrical conductivity with added phenolic resin. The optimized SiOC ceramic M1-PF delivers a reversible capacity of 775.5?mAh g?1 after 300 cycles at 0.5 A g?1, and 344?mAh g?1 at 4 A g?1. A full cell with M1-PF and LiFePO4 retains 89.7?% capacity after 100 cycles at 0.2 A g?1. This work provides new insights for customizing SiOC ceramics for advanced battery applications.

Substances (3)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Methanol 67-56-1 CH4O 837 suppliers $9.00-$7620.00
Ethanol 64-17-5 C2H6O 808 suppliers $10.00-$17310.00
(Chloromethyl)trichlorosilane 1558-25-4 CH2Cl4Si 167 suppliers $23.00-$307.00

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