Electrochemical characteristics of amorphous silicon thin film electrode with fluoroethylene carbonate additive

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

doi:10.1016/j.cap.2014.02.008

Cited by 36 publications

(22 citation statements)

References 50 publications

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“…The preferential reduction of FEC at potentials greater than 0.9 V (vs. Li/Li + ) forms a more organic C=O containing polymeric surface layer. This layer is not the SEI but the SEI precursor which further reacts at 0.6 V to form a layer with more C-O species from the polymerization of cyclic carbonates (likely from FEC) 14 , 23 – 25 , 28 – 31 . The SEI layer formed during charging from the electrolyte without FEC is comprised from more inorganic LiF like components.…”

Section: Discussionmentioning

confidence: 99%

“…However the exact details, derived from traditional SEI studies such as with XPS, are contradictory and confusing to sort out given the variety of electrode configurations (only Si versus composite) and states of charge investigated. One of the main variations revolves around reported XPS data regarding the concentration of F-containing species (LiF) and the organic chemistry from the polymers 28 . The origin of the LiF could come from either the LiPF 6 salt or decomposition of the FEC 7 , 29 .…”

Section: Introductionmentioning

confidence: 99%

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Determination of the Solid Electrolyte Interphase Structure Grown on a Silicon Electrode Using a Fluoroethylene Carbonate Additive

Veith

Doucet

Sacci

et al. 2017

Sci Rep

179

170

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In this work we explore how an electrolyte additive (fluorinated ethylene carbonate – FEC) mediates the thickness and composition of the solid electrolyte interphase formed over a silicon anode in situ as a function of state-of-charge and cycle. We show the FEC condenses on the surface at open circuit voltage then is reduced to C-O containing polymeric species around 0.9 V (vs. Li/Li+). The resulting film is about 50 Å thick. Upon lithiation the SEI thickens to 70 Å and becomes more organic-like. With delithiation the SEI thins by 13 Å and becomes more inorganic in nature, consistent with the formation of LiF. This thickening/thinning is reversible with cycling and shows the SEI is a dynamic structure. We compare the SEI chemistry and thickness to 280 Å thick SEI layers produced without FEC and provide a mechanism for SEI formation using FEC additives.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of the Solid Electrolyte Interphase Structure Grown on a Silicon Electrode Using a Fluoroethylene Carbonate Additive

Veith

Doucet

Sacci

et al. 2017

Sci Rep

179

170

View full text Add to dashboard Cite

show abstract

“…Compared with another additive that contains fluorine functional group, FEC, the SEI formation of the cell with FEC additive is F‐containing species (LiF) and the organic chemistry from the polymers . The LiF compound could initially come from either the LiPF6 salt or decomposition of the FEC .…”

Section: Sei Evaluationmentioning

confidence: 99%

“…Compared with another additive that contains fluorine functional group, FEC, the SEI formation of the cell with FEC additive is F-containing species (LiF) and the organic chemistry from the polymers. 23 The LiF compound could initially come from either the LiPF6 salt or decomposition of the FEC. 24,25 LiF is undoubtedly a stable compound but exhibits no flexibility and is a compact, inorganic substance, which therefore turns out to be somewhat disadvantageously on the reversibility of anode materials with substantial volume changes.…”

Section: Xps Analysismentioning

confidence: 99%

The understanding of solid electrolyte interface (SEI) formation and mechanism as the effect of flouro‐o‐phenylenedimaleimaide (F‐MI) additive on lithium‐ion battery

Hamidah

Wang

Nugroho

2018

Surface & Interface Analysis

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Solid electrolyte interface (SEI) is a critical factor that influences battery performance. SEI layer is formed by the decomposition of organic and inorganic compounds after the first cycle. This study investigates SEI formation as a product of electrolyte decomposition by the presence of flouro‐o‐phenylenedimaleimaide (F‐MI) additive. The presence of fluorine on the maleimide‐based additive can increase storage capacity and reversible discharge capacity due to high electronegativity and high electron‐withdrawing group. The electrolyte containing 0.1 wt% of F‐MI‐based additive can trigger the formation of SEI, which could suppress the decomposition of remaining electrolyte. The reduction potential was 2.35 to 2.21 V vs Li/Li+ as examined by cyclic voltammetry (CV). The mesocarbon microbeads (MCMB) cell with F‐MI additive showed the lowest SEI resistance (Rsei) at 5898 Ω as evaluated by the electrochemical impedance spectroscopy (EIS). The morphology and element analysis on the negative electrode after the first charge‐discharge cycle were examined by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and X‐ray photoelectron spectroscopy (XPS). XPS result showed that MCMB cell with F‐MI additive provides a higher intensity of organic compounds (RCH2OCO2Li) and thinner SEI than MCMB cell without an additive that provides a higher intensity of inorganic compound (Li2CO3 and Li2O), which leads to the performance decay. It is concluded that attaching the fluorine functional group on the maleimide‐based additive forms the ideal SEI formation for lithium‐ion battery.

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“…Besides, electrolyte also plays a very important role in the battery performance. For example, some additives like fluoroethylene carbonate (FEC) [28]…”

Section: Development Of Si-based Anode Materialsmentioning

confidence: 99%

Preparation of SiCNFs Composite Anode by Electrophoretic Deposition (EPD)

Ye¹

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Preparation of Si/CNFs Composite Anode by Electrophoretic Deposition (EPD) Meng Yao Recently, lithium ion batteries (LIBs) have been widely used in the field of portable electronic devices and electric vehicles due to high adaptability, high working voltage and low toxicity. However, traditional electrode materials have greatly limited the future of LIBs because of their low theoretical specific capacities; meanwhile, new electrode materials always need to be prepared by complicated and expensive methods, indicating the small probability of large-scale promotion. In this study, the Si/CNFs composite film anode without any binder by a simple and effective method-electrophoretic deposition (EPD)-is developed, which exhibits improved electrochemical properties. This thesis is firstly focused on building a metastable/stable system for the multicomponent (Si/CNFs) EPD. It's observed that in the basic condition (pH9-10) or acidic condition (pH0.5), a suspension in ethanol consisting of surface-modified Si and CNFs can approximately keep stable for at least 0.5h, which can meet the minimum requirements for a successful deposition. Based on the dynamics analysis, a new "three-step growth theory" on the deposition process is proposed.

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Electrochemical characteristics of amorphous silicon thin film electrode with fluoroethylene carbonate additive

Cited by 36 publications

References 50 publications

Determination of the Solid Electrolyte Interphase Structure Grown on a Silicon Electrode Using a Fluoroethylene Carbonate Additive

Determination of the Solid Electrolyte Interphase Structure Grown on a Silicon Electrode Using a Fluoroethylene Carbonate Additive

The understanding of solid electrolyte interface (SEI) formation and mechanism as the effect of flouro‐o‐phenylenedimaleimaide (F‐MI) additive on lithium‐ion battery

Preparation of SiCNFs Composite Anode by Electrophoretic Deposition (EPD)

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