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A comparative investigation of different chemical treatments on SiO anode materials for lithium-ion batteries: towards long-term stability

Title
A comparative investigation of different chemical treatments on SiO anode materials for lithium-ion batteries: towards long-term stability
Authors
Woo, J[Woo, Jihoon]Baek, SH[Baek, Seong-Ho]
DGIST Authors
Baek, SH[Baek, Seong-Ho]
Issue Date
2017
Citation
RSC Advances, 7(8), 4501-4509
Type
Article
Article Type
Article
Keywords
AnodesCharge TransferChemical StabilityChemical TreatmentsCoated MaterialsCoatingsComparative StudiesDoping (Additives)Electric BatteriesElectro-Chemical ElectrodesElectro-Chemical Impedance Spectroscopy (EIS)Electrochemical ActivitiesElectrochemical PerformanceElectrodesImpuritiesInternal ResistanceLithiation/DelithiationLithiumLithium-Ion BatteriesLithium AlloysLithium CompoundsLong Term StabilityMicro-Structural AnalysisRedox ReactionsSecondary Batteries
ISSN
2046-2069
Abstract
In this work, we conduct a comparative study of boron-doped SiO (HB-SiO) and carbon-coated SiO (HC-SiO) to find an effective means of improving the electrochemical performances of SiO anode materials during long-cycle tests. Carbon-coating processes are widely introduced to provide electrical pathways for charge transfer, resulting in a decrease of the internal resistance. However, capacity fading is inevitably caused by the electrical loss between the SiO anode materials and the carbon-coating upon cycling. On the other hand, even when the HB-SiO electrodes are pulverized, the remaining materials are electrochemically active owing to the presence of Li ion pathways inside the active materials created by dopant diffusion. Electrochemical impedance spectroscopy and microstructural analysis confirm that the excellent electrochemical performance of the HB-SiO electrode originates from the Li kinetic enhancement in the SiO electrodes, enhancing the reversibility of the redox reaction compared to a HC-SiO electrode during the lithiation/delithiation process. Therefore, we conclude that impurity doping of alloy-type anode materials would be a better way to ensure that the electrochemical activity remains superior to carbon-coating in terms of long-term stability. © The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/2101
DOI
10.1039/c6ra27804c
Publisher
Royal Society of Chemistry
Files:
There are no files associated with this item.
Collection:
Smart Textile Convergence Research Group1. Journal Articles


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