Effect of fluoroethylene carbonate additive on interfacial properties of silicon thin-film electrode

Choi, Nam‐Soon; Yew, Kyoung Han; Lee, Kyu Youl; Sung, Minseok; Kim, Ho; Kim, Sung‐Soo

doi:10.1016/j.jpowsour.2006.05.049

Cited by 578 publications

(510 citation statements)

References 15 publications

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“…3b and 3c), which shows that in the equivalent circuit model there is a larger contribution from SEI impedance when FEC and VC additives are not used. The additives FEC 39 and VC 40 are known to suppress solvent and salt reduction, resulting in thinner and more stable SEI films with lower impedance. In the case of the (111) wafers, j o is 0.09 ± 0.01 mA/cm 2 for the electrolyte with FEC and VC, nearly identical to results for the (100) wafers.…”

Section: Resultsmentioning

confidence: 99%

“…This electrolyte formulation has been shown to improve Si electrode cycling performance and has been adopted by several research groups. 23,32,39,40 Electrode characterization.-Silicon wafers with native SiO 2 films were used for all experiments. The thickness of the SiO 2 film was determined to be 15 ± 3 nm, using a variable angle ellipsometer from Gaertner Scientific Corp. (Skokie, Illinois, USA).…”

Section: Methodsmentioning

confidence: 99%

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Electrochemical Charge Transfer Reaction Kinetics at the Silicon-Liquid Electrolyte Interface

Swamy¹,

Chiang²

2015

J. Electrochem. Soc.

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Since the gravimetric lithiation capacity of silicon is roughly ten times that of graphite, while their mass densities are comparable, for the same particle size the current density required to cycle a silicon electrode at a given C-rate is about ten times greater than that of graphite. Depending on the magnitude of the corresponding Butler-Volmer exchange current density, jo, such high current densities may cause the charge transfer kinetics at the silicon-electrolyte interface to become rate limiting. Previously reported values of jo for Si differ by about 10 orders of magnitude. Here we report jo measurements using electrochemical impedance spectroscopy (EIS) for single crystal electronically conductive silicon wafers with well-defined (100) and (111) orientations and active surface areas. The electrochemical cycling regime was designed to avoid artifacts due to stress-induced surface cracking of Si upon lithiation. The exchange current density of the silicon-electrolyte interface is found to be 0.1 ± 0.01 mA/cm2 when using electrolyte consisting of 1 M LiPF6 in EC/DMC (1/1 by wt) + FEC (10 wt%) + VC (2 wt%). These results are then used to illustrate the dependence of kinetic overpotential on particle size and C-rate for silicon compared to lower volumetric capacity compounds such as graphite.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Electrochemical Charge Transfer Reaction Kinetics at the Silicon-Liquid Electrolyte Interface

Swamy¹,

Chiang²

2015

J. Electrochem. Soc.

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“…The SEI-forming additive (10 wt% FEC) was then added to [Li(G4)][TFSA]/HFE. [14][15][16] The overpotential was significantly reduced by the addition of FEC in [Li(G4)][TFSA]/HFE, and the cyclability was also improved. The discharge curves in [Li(G4)][TFSA]/HFE+FEC were almost overlapped one another up to 50 cycles as shown in Fig.…”

Section: ¹1mentioning

confidence: 99%

Cycle Performances of Si-flake-powder Anodes in Lithium Salt-tetraglyme Complex Electrolytes

et al. 2015

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Charge and discharge properties of amorphous Si nano-flake powder (Si Leaf Powder ® , Si-LP) in lithium bis(trifluoromethanesulfonyl)amide-tetraglyme complex electrolyte, [Li(G4)][TFSA], were investigated for use as an anode in silicon-sulfur battery. Though a high reversible capacity (2,300-2,700 mAh g, the overpotential gradually increased upon cycling. The increase in overpotential was reduced by dilution with 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether. The addition of fluoroethylene carbonate (FEC) further reduced the overpotential and improved cycleability. Electrochemical impedance spectroscopy analysis revealed that the observed improvements in charge and discharge characteristics are due to the formation of solid electrolyte interface layer with a high ionic-conductivity in the presence of FEC.

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“…Simultaneously, the electrolyte plays an important role in the formation of a stable passivation film on the electrode surface, whose area increases continually because of pulverization. Among several candidates, electrolytes with large amounts of fluoroethylene carbonate (FEC) additive have been studied to cover the newly exposed electrochemically active surfaces [9][10][11]. The electrolytes for conventional graphite anodes in LIBs usually contain a small quantity of additives, less than 10 vol%.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fluoroethylene Carbonate in the Electrolyte for LiNi_0.5Mn_1.5O₄ Cathode in Lithium-ion Batteries

Kim

Kang

et al. 2017

Journal of Electrochemical Science and Technology

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Fluoroethylene carbonate (FEC) was studied as an additive for the electrolyte in lithium ion batteries with the LiNi(LNMO) spinel cathode operating at a high potential beyond 4.7 V (vs. Li/Li + ). It was found that the FEC additive was electrochemically active for the 1 s t charge cycle on the LNMO cathode. The presence of a large amount of FEC (more than 40 vol%) in the electrolyte caused severe side reactions with abnormally long voltage plateaus. In contrast, when the electrolyte contained less than 30 vol% FEC , the surface of the LNMO cathode was stabilized by the formation of the solid-electrolyte interphase (SEI), leading to improved cyclability. However, the resistance from the SEI limited the rate capability because of sluggish lithium transportation through the SEI and electronic insulation between the particles in the electrode.

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Effect of fluoroethylene carbonate additive on interfacial properties of silicon thin-film electrode

Cited by 578 publications

References 15 publications

Electrochemical Charge Transfer Reaction Kinetics at the Silicon-Liquid Electrolyte Interface

Electrochemical Charge Transfer Reaction Kinetics at the Silicon-Liquid Electrolyte Interface

Cycle Performances of Si-flake-powder Anodes in Lithium Salt-tetraglyme Complex Electrolytes

Effect of Fluoroethylene Carbonate in the Electrolyte for LiNi_0.5Mn_1.5O₄ Cathode in Lithium-ion Batteries

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Effect of fluoroethylene carbonate additive on interfacial properties of silicon thin-film electrode

Cited by 578 publications

References 15 publications

Electrochemical Charge Transfer Reaction Kinetics at the Silicon-Liquid Electrolyte Interface

Electrochemical Charge Transfer Reaction Kinetics at the Silicon-Liquid Electrolyte Interface

Cycle Performances of Si-flake-powder Anodes in Lithium Salt-tetraglyme Complex Electrolytes

Effect of Fluoroethylene Carbonate in the Electrolyte for LiNi0.5Mn1.5O4 Cathode in Lithium-ion Batteries

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Effect of Fluoroethylene Carbonate in the Electrolyte for LiNi_0.5Mn_1.5O₄ Cathode in Lithium-ion Batteries