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The effect of acetonitrile as an additive on the ionic conductivity of imidazolium-based ionic liquid electrolyte and charge-discharge capacity of its Li-ion battery

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Abstract

In this paper, we report the effect of a small quantity of acetonitrile (ACN) addition to an ionic liquid-based electrolyte for lithium-ion (Li-ion) batteries, which is comprised of lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) salt dissolved in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIMTFSI). The addition of a small amount of ACN results in the increase of ionic conductivity, and at a proper molal fraction, it may significantly improve the charge-discharge capacity of its half-cell battery. A large amount of ACN addition, however, reduces the specific capacity because ACN molecules are more susceptible to irreversible redox reactions at the battery electrodes. The experimental results are also compared with the X-ray diffraction (XRD pattern) of the solutions, which may lead to a suggestion in the formation of coordination complexes between the Li+ cations with ACN molecules, which effectively hinders the formation of strong Li+-TFSI− ionic bonding and therefore increases the Li+ cation mobility. Different from other reports, the role of this small quantity of ACN is considered not only as a co-solvent, but also as an additive to this LiTFSI/BMIMTFSI electrolyte.

The ac conductivity spectra of LiTFSI in EC:DEC measured in a coin cell with an O-ring Teflon spacer and Celgard membrane separator (commonly used in Li-ion battery). Extra figure was captured as "Graphical abstract." Please check if it is presented and captured correctly.Please replace the figure for this Graphical Abstract with the figure from Fig. 7 (The charge-discharge characteristics of the half-cells with Li|electrolyte|LiFePO4 configuration using a 1-BT-0 (1 molal of LiTFSI, without ACN additive), b 1-BT-1 (1 molal of LiTFSI and 1 molal of ACN), and c 4-BT-1 (4 molal of LiTFSI and 1 molal of ACN) electrolytes.)The extra figure (representing the ac conductivity spectra of LiTFSI in EC:DEC measured in a coin cell with an O-ring Teflon spacer and Celgard membrane separator (commonly used in Li-ion battery) was sent for reviewing process as additional data/information to the reviewer. It's not intended to be included in this manuscript.

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Funding

The authors gratefully acknowledge the financial support from the Ministry of Research and Technology of Indonesia through Program INSINAS Konsorsium Riset Energi Baru dan Terbarukan: Pengembangan Baterai Lithium sebagai Energy Storage Pembangkit Listrik Tenaga Surya under contract no. IRPK-2018-148.

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Authors and Affiliations

  1. Physics Graduate Program, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, Jawa Barat, Indonesia

    Rida Nurul Shelni Rofika & Rahmat Hidayat

  2. Science and Technology Center for Advanced Materials, National Nuclear Energy Agency (BATAN), Indonesia, Puspiptek Area, Serpong, South Tangerang, 15314, Indonesia

    Wagiyo Honggowiranto, Heri Jodi, Sudaryanto Sudaryanto & Evvy Kartini

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  1. Rida Nurul Shelni Rofika
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Rofika, R.N.S., Honggowiranto, W., Jodi, H. et al. The effect of acetonitrile as an additive on the ionic conductivity of imidazolium-based ionic liquid electrolyte and charge-discharge capacity of its Li-ion battery. Ionics 25, 3661–3671 (2019). https://doi.org/10.1007/s11581-019-02919-4

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