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Oligo(ethylene oxide)-functionalized trialkoxysilanes as novel electrolytes for high-voltage lithium-ion batteries

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Abstract

Oligo(ethylene oxide)-functionalized trialkoxysilanes were synthesized through hydrosilylation reaction by reacting trialkoxysilane with oligo(ethylene oxide) allyl methyl ether using PtO2 as a catalyst. The physical properties of these compounds, such as viscosity, dielectric constant, and ionic conductivity, were characterized. Among them, [3-(2-(2-methoxyethoxy)ethoxy)-propyl]triethoxysilane (TESM2) exhibited a commercial viable ionic conductivity of 1.14 mS cm−1 and a wide electrochemical window of 5.2 V. A preliminary investigation was conducted by using TESM2 as an electrolyte solvent for high-voltage applications in lithium-ion batteries. Using 1 M LiPF6 in TESM2 with 1 vol% vinyl carbonate as an electrolyte, LiCoO2/Li half-cell delivered a specific capacity of 153.9 mAh g−1 and 90 % capacity retention after 80 cycles (3.0–4.35 V, 28 mA g−1); Li1.2Ni0.2Mn0.6O2/Li4Ti5O12 full cell exhibited the initial capacity of 161.3 mAh g−1 and 86 % capacity retention after 30 cycles (0.5–3.1 V, 18 mA g−1).

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Acknowledgments

This work was supported by the National Science Foundation of China (50973112), the Hundred Talents Program of the Chinese Academy of Sciences (CAS), CAS-Guangdong Collaboration Program (20108), and Science & Technology Project of Guangzhou (11A44061500). Partial financial assistance was also supported by Amperex Technology Limited (China).

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Authors and Affiliations

  1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China

    Xueying Qin, Jinglun Wang, Yongjin Mai, Daoping Tang, Xinyue Zhao & Lingzhi Zhang

  2. University of Chinese Academy of Sciences, Beijing, 100039, China

    Xueying Qin

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  1. Xueying Qin
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  2. Jinglun Wang
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  3. Yongjin Mai
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  4. Daoping Tang
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  5. Xinyue Zhao
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  6. Lingzhi Zhang
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Correspondence to Lingzhi Zhang.

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Qin, X., Wang, J., Mai, Y. et al. Oligo(ethylene oxide)-functionalized trialkoxysilanes as novel electrolytes for high-voltage lithium-ion batteries. Ionics 19, 1567–1572 (2013). https://doi.org/10.1007/s11581-013-0888-z

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  • DOI: https://doi.org/10.1007/s11581-013-0888-z

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