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Improved electrochemical performance of boron-doped SiO negative electrode materials in lithium-ion batteries

Title
Improved electrochemical performance of boron-doped SiO negative electrode materials in lithium-ion batteries
Authors
Woo, J[Woo, Jihoon]Baek, SH[Baek, Seong-Ho]Park, JS[Park, Jung-Soo]Jeong, YM[Jeong, Young-Min]Kim, JH[Kim, Jae Hyun]
DGIST Authors
Baek, SH[Baek, Seong-Ho]; Park, JS[Park, Jung-Soo]; Jeong, YM[Jeong, Young-Min]; Kim, JH[Kim, Jae Hyun]
Issue Date
2015-12-20
Citation
Journal of Power Sources, 299, 25-31
Type
Article
Article Type
Article
Keywords
Amorphous SiliconBoron-DopingBoron DopingCarbonDisproportionation ReactionDisproportionation ReactionsDoping (Additives)Electric BatteriesElectrical ConductivityElectro-Chemical ElectrodesElectro-Chemical Impedance Spectroscopy (EIS)Electrochemical Impedance Spectroscopy MeasurementsElectrochemical PerformanceElectrodesIonsLithiumLithium-Ion BatteriesLithium AlloysLithium CompoundsLithium Ion BatteriesNegative Electrode MaterialNegative Electrode MaterialsSiliconSilicon MonoxideSilicon OxidesThermal DisproportionationTransmission Electron Microscopy
ISSN
0378-7753
Abstract
We introduce a one-step process that consists of thermal disproportionation and impurity doping to enhance the reversible capacity and electrical conductivity of silicon monoxide (SiO)-based negative electrode materials in Li-ion batteries. Transmission electron microscope (TEM) results reveal that thermally treated SiO at 900 °C (H-SiO) consists of uniformly dispersed nano-crystalline Si (nc-Si) in an amorphous silicon oxide (SiOx) matrix. Compared to that of prinstine SiO, the electrochemical performance of H-SiO shows improved specific capacity, due mainly to the increased reversible capacity by nc-Si and to the reduced volume expansion by thermally disproportionated SiOx matrix. Further electrochemical improvements can be obtained by boron-doping on SiO (HB-SiO) using solution dopant during thermal disproportionation. HB-SiO electrode without carbon coating exhibits significantly enhanced specific capacity superior to that of undoped H-SiO electrode, having 947 mAh g-1 at 0.5C rate and excellent capacity retention of 93.3% over 100 cycles. Electrochemical impedance spectroscopy (EIS) measurement reveals that the internal resistance of the HB-SiO electrode is significantly reduced by boron doping. © 2015 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/2796
DOI
10.1016/j.jpowsour.2015.08.086
Publisher
Elsevier B.V.
Files:
There are no files associated with this item.
Collection:
Division of Nano∙Energy Convergence Research1. Journal Articles


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