Lifetime vs. rate capability: Understanding the role of FEC and VC in high-energy Li-ion batteries with nano-silicon anodes

By T. Jaumann, Juan Balach, U. Langklotz, V. Sauchuk, M. Fritsch, A. Michaelis, Valerij Teltevskij, D. Mikhailova, S. Oswald, M. Klose and 4 more. 2017

236 citations recorded by the source corpus.

Abstract Fluoroethylene carbonate (FEC) and vinylene carbonate (VC) are the most frequently used electrolyte components to enhance the lifetime of anode materials in Li-ion batteries, but for silicon it is still ambiguous when FEC or VC is more beneficial. Herein, a nanostructured silicon/carbon anode derived from low-cost HSiCl 3 is tailored by the rational choice of the electrolyte component, to obtain an anode material outperforming current complex silicon structures. We demonstrate highly reversible areal capacities of up to 5 mA h/cm 2 at 4.4 mg/cm 2 mass loading, a specific capacity of 1280 mA h/g Electrode , a capacity retention of 81% after 500 deep-discharge cycles versus lithium metal and successful full-cell tests with high-voltage cathodes meeting the requirements for real application. Electrochemical impedance spectroscopy and post-mortem investigation provide new insights in tailoring the interfacial properties of silicon-based anodes for high performance anode materials based on an alloying mechanism with large volume changes. The role of fluorine in the FEC-derived interfacial layer is discussed in comparison with the VC-derived layer and possible degradation mechanisms are proposed. We believe that this study gives a valuable understanding and provides new strategies on the facile use of additives for highly reversible silicon anodes in Li-ion batteries.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/49620956488fcde74fad86d60d334e93dde428f6

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In Electrical and Electronic Engineering

1. Yi Cui
2. Yuzhang Li
3. Jiangyan Wang
4. W. Huang
5. D. T. Boyle
6. L. Ellis
7. A. Louli
8. Paul C. McIntyre

In Electronic, Optical and Magnetic Materials

1. Yi Cui
2. J. Dahn

Citations in the corpus

• Operando Pressure Measurements Reveal Solid Electrolyte Interphase Growth to Rank Li-Ion Cell Performance (2019, background): “Jaumann et al.60 have shown results for cells with SiC negative electrodes that contain electrolyte with 20% FEC exhibit a lower CE than cells with 10% FEC; Jung et al.34 have also shown that increasing FEC content from 5% to 10% to 20% slightly decreases the Joule 3, 1–17, March 20, 2019 11 Rate of”
• Dynamic Structure and Chemistry of the Silicon Solid-Electrolyte Interphase Visualized by Cryogenic Electron Microscopy (2019, background): “FEC is believed to decompose into fluoride anions, generating LiF, along with vinylene carbonate (VC) radicals, prior to reduction of other electrolyte components.(31,32) The deposition of FEC decomposition products modifies the SEI chemistry and properties, with the performance enhancement attribut”