Electrochemical characteristics of phosphorus doped silicon for the anode material of lithium secondary batteries

Kim, Jung Sub; Choi, Wonchang; Byun, Dongjin; Lee, Joong Kee

doi:10.1016/j.ssi.2012.01.046

Cited by 32 publications

(25 citation statements)

References 17 publications

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“…6e). It is clearly observed that there is one main peak in the Si2p spectra dominated by CeOeSi bond (102.0 eV) [21] and two main peaks in the B1s spectra. These results indicate that the TMSB additives participated in the formation of SEI.…”

Section: Resultsmentioning

confidence: 99%

Tris(trimethylsilyl) borate as an electrolyte additive to improve the cyclability of LiMn2O4 cathode for lithium-ion battery

Liu

2013

Journal of Power Sources

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Section: Resultsmentioning

confidence: 99%

Tris(trimethylsilyl) borate as an electrolyte additive to improve the cyclability of LiMn2O4 cathode for lithium-ion battery

Liu

2013

Journal of Power Sources

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“…Two main time constants have been identified, a fast one related to interfacial characteristics, and a slow one related to Li diffusion in the electrodes [18,19]. The solid state diffusion of Li in Si could be understood using a Warburg impedance for modeling the impedance data in a frequency well below 1 Hz.…”

Section: Resultsmentioning

confidence: 99%

“…Impedance spectroscopy (IS) is a powerful method able to produce relevant information for electrochemical processes and has been used to analyze Si anodes, mostly post-mortem or ex situ [ 18 , 19 ]. Two main time constants have been identified, a fast one related to interfacial characteristics, and a slow one related to Li diffusion in the electrodes [ 18 , 19 ]. The solid state diffusion of Li in Si could be understood using a Warburg impedance for modeling the impedance data in a frequency well below 1 Hz.…”

Section: Resultsmentioning

confidence: 99%

Structural and Electrochemical Investigation during the First Charging Cycles of Silicon Microwire Array Anodes for High Capacity Lithium Ion Batteries

2013

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Silicon microwire arrays embedded in Cu present exceptional performance as anode material in Li ion batteries. The processes occurring during the first charging cycles of batteries with this anode are essential for good performance. This paper sheds light on the electrochemical and structural properties of the anodes during the first charging cycles. Scanning Electron Microscopy, X-ray diffractommetry, and fast Fourier transformation impedance spectroscopy are used for the characterization. It was found that crystalline phases with high Li content are obtained after the first lithiation cycle, while for the second lithiation just crystalline phases with less Li are observable, indicating that the lithiated wires become amorphous upon cycling. The formation of a solid electrolyte interface of around 250 nm during the first lithiation cycle is evidenced, and is considered a necessary component for the good cycling performance of the wires. Analog to voltammetric techniques, impedance spectroscopy is confirmed as a powerful tool to identify the formation of the different Si-Li phases.

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“…To further provide evidence of P doping, Si-P and P-P bonds at 128.9 and 130.5 eV can be found from the P 2p XPS spectrum of P-doped Si@C sample in Fig. 4(e) [37,41,44,45]. Moreover, P 2s XPS spectrum as given in Fig.…”

Section: Figurementioning

confidence: 93%

High power and stable P-doped yolk-shell structured Si@C anode simultaneously enhancing conductivity and Li+ diffusion kinetics

et al. 2020

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Silicon is a low price and high capacity anode material for lithium-ion batteries. The yolk-shell structure can effectively accommodate Si expansion to improve stability. However, the limited rate performance of Si anodes can’t meet people’s growing demand for high power density. Herein, the phosphorus-doped yolk-shell Si@C materials (P-doped Si@C) were prepared through carbon coating on P-doped Si/SiOx matrix to obtain high power and stable devices. Therefore, the as-prepared P-doped Si@C electrodes delivered a rapid increase in Coulombic efficiency from 74.4% to 99.6% after only 6 cycles, high capacity retention of ∼ 95% over 800 cycles at 4 A·g−1, and great rate capability (510 mAh·g−1 at 35 A·g−1). As a result, P-doped Si@C anodes paired with commercial activated carbon and LiFePO4 cathode to assemble lithium-ion capacitor (high power density of ∼ 61,080 W·kg−1 at 20 A·g−1) and lithium-ion full cell (good rate performance with 68.3 mAh·g−1 at 5 C), respectively. This work can provide an effective way to further improve power density and stability for energy storage devices.

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Electrochemical characteristics of phosphorus doped silicon for the anode material of lithium secondary batteries

Cited by 32 publications

References 17 publications

Tris(trimethylsilyl) borate as an electrolyte additive to improve the cyclability of LiMn2O4 cathode for lithium-ion battery

Tris(trimethylsilyl) borate as an electrolyte additive to improve the cyclability of LiMn2O4 cathode for lithium-ion battery

Structural and Electrochemical Investigation during the First Charging Cycles of Silicon Microwire Array Anodes for High Capacity Lithium Ion Batteries

High power and stable P-doped yolk-shell structured Si@C anode simultaneously enhancing conductivity and Li+ diffusion kinetics

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