Optimizing solid electrolyte interphase on graphite anode by adjusting the electrolyte solution structure with ionic liquid

Gao, Ximei; Ding, Yuanlei; Qu, Qunting; Liu, Gao; Battaglia, Vincent; Zheng, Honghe

doi:10.1016/j.electacta.2017.12.009

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…In recent years, with the rapid development of electric vehicles (EVs) and grid energy storage systems (ESS), lithium-ion batteries (LIBs) have attracted the attention of extensive researchers due to their high energy density, good cycling stability and long life. [1][2][3] However, the development of LIBs in the direction of large capacity is limited due to the limited cathode materials on the market. The capacity of layered LiNi 1-x-y Co x Mn y O 2 (content of nickel below 60%) cathode materials for lithium-ion batteries is 150∼160 mAh g −1 approximately, and it can't meet requirements of burgeoning next generation lithium-ion batteries which need higher energy density.…”

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confidence: 99%

Enhanced Electrochemical Performance of LiNi_0.8Co_0.1Mn_0.1O₂ Cathode with an Ionic Liquid-Based Electrolyte

Wang

Yang

et al. 2019

J. Electrochem. Soc.

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An ionic liquid-based electrolyte consisted of N-methyl-N-propylpyrrolidine bis(trifluoromethanesulfonyl)imide (Pyr 13 TFSI), sulfolane (SL) and ethyl methyl carbonate (EMC) as co-solvent, lithium difluoro(oxalate)borate (LiDFOB) as Li salt for cathode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) is investigated in this study. The electrolyte with ionic liquid (IL) has improved safety characteristics and a wide electrochemical window that can reach 4.8V (vs. Li/Li + ). The Li/NCM811 half-cells with the electrolyte display outstanding electrochemical performance, achieving a discharge capacity and capacity retention of 166.1 mAh g −1 and 97.6% after 100 cycles between 3.0 and 4.3V at 25°C. This excellent electrochemical performance is due to a thin and compact cathode electrolyte interphase (CEI) film formed on the surface of the LiNi 0.8 Co 0.1 Mn 0.1 O 2 electrode derived from the electrolyte with IL and reduction of lithium dendrite formation. The film inhibits the volume change of the material during the charge-discharge cycles and maintains the structural integrity of the cathode material, which enhances electrochemical performance of the Li/NCM811 half-cells.

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confidence: 99%

Enhanced Electrochemical Performance of LiNi_0.8Co_0.1Mn_0.1O₂ Cathode with an Ionic Liquid-Based Electrolyte

Wang

Yang

et al. 2019

J. Electrochem. Soc.

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“…Due to the large dissimilarity in the structural, chemical, mechanical, electrochemical and electrical properties between SEs and electrodes, multiple interfacial mechanisms can be involved in the charge transport, such as chemical/electrochemical decomposition, elemental interfusion, structural deformation of the crystal lattice, and changes in the mechanical integrity. [45,[47][48][49][50][51][52][53][54][55][56][57] These mechanisms can influence each other and may evolve during different stages of charging, complicating the analysis of interfaces with SEs. A fundamental understanding of which mechanisms are at play and how they influence each other is the key to develop descriptors of design for chemically stable and highly conductive SEs and their interfaces at the atomic to microscopic scale.…”

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confidence: 99%

Mechanistic understanding and strategies to design interfaces of solid electrolytes: insights gained from transmission electron microscopy

Hood

Chi

2019

J Mater Sci

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Solid electrolytes (SEs) have garnered increased attention for their promise to enable higher volumetric energy density and enhanced safety required for future battery systems. SEs are not only a key constituent in all-solid-state batteries, but also are important "protectors" of Li-metal anodes in next-generation battery configurations, such as Li-air, Li-S, redox flow batteries, among others. The impedance at interfaces associated with SEs, e.g. internal grain/phase boundaries and their interfacial stability with electrodes, represent two key factors limiting the performance of SEs, yet analyzing these interfaces experimentally at the nano/atomic scale is generally challenging. A mechanistic understanding of the possible instability at interfaces and propagation of interfacial resistance will pave the way to the design of high-performance SE-based batteries. In this review, we briefly introduce the fundamentals of SEs and challenges associated with their interfaces. Next, we discuss experimental techniques that allow for atomic-to-microscale understanding of ion transport and stability in SEs and at their interfaces, specifically highlighting the applications of state-of-art and emerging ex situ and in situ transmission electron microscopy (TEM) and scanning TEM (STEM). Representative examples from current literature that exemplify recent fundamental insights gained from these S/TEM techniques are highlighted. Applicable strategies to improve ion conduction and interfaces in SE-based batteries are also discussed. This review concludes by highlighting opportunities for future research that will significantly promote the fundamental understanding of SEs, specifically further developments in S/TEM techniques that will bring new insights into the design of high-performance interfaces for future electrical energy storage.

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“…21 Our previous study suggested that the partial substitution of LiTFSI with PP 13 * TFSI could adjust the solution structure to improve the compatibility of PC with graphite anode in concentrated PC-based electrolyte. 29 Additionally, the room ionic liquid with different viscosity were also done the same substitution, such as PP 13 TFSI, PY 14 TFSI, Py 13 FSI. We found that these ILs substitution could not realize the adjustment of solution structure to improve the performance of graphite anode in the same PC electrolyte solution eventhough the IL (i. e., Py 13 FSI) has a lower viscocity.…”

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Effects of Room Ionic Liquid as Solute on the Electrolyte Solution Structure and Electrochemical Performances in Ethylene Carbonate-Based Electrolyte

Gao¹,

Zhu²,

Qu³

et al. 2018

J. Electrochem. Soc.

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Room ionic liquid N-allyl-N-methylpiperidinium bis(trifuoromethansulfonyl)imide (PP 13 * TFSI) was adopted as a solute to partly substitute LiPF 6 in concentrated ethylene carbonate (EC) based electrolyte (1.8 mol L −1 LiPF 6 /EC). Raman and FTIR spectroscopic studies revealed that the electrolyte solution structure was adjusted in the presence of PP 13 * TFSI ionic liquid. Solvation number of Li + cation could be effectively regulated by the competitive coordination of PP 13 * + and Li + with EC molecules. More importantly, the appearance of TFSI − anion brings about a different coordinating environment of PF 6− anion in virtue of the stronger association capability of the TFSI − than that of PF 6 − , which resulted in a content regulation of the SEI components between Li 2 CO 3 and LiF, finally contributing to a remarkable cycle life of graphite/Li cell comprising electrolyte with PP 13 * TFSI. The optimized molar ratio between LiPF 6 salt and PP 13 * TFSI ionic liquid was obtained to be 3:1. Differential scanning calorimetry (DSC) confirmed significantly widened liquid range in the EC-based electrolytes with PP 13 * TFSI substitution. This work will provide a new insight and thinking on the application of room ionic liquid.

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Optimizing solid electrolyte interphase on graphite anode by adjusting the electrolyte solution structure with ionic liquid

Cited by 7 publications

References 38 publications

Enhanced Electrochemical Performance of LiNi_0.8Co_0.1Mn_0.1O₂ Cathode with an Ionic Liquid-Based Electrolyte

Enhanced Electrochemical Performance of LiNi_0.8Co_0.1Mn_0.1O₂ Cathode with an Ionic Liquid-Based Electrolyte

Mechanistic understanding and strategies to design interfaces of solid electrolytes: insights gained from transmission electron microscopy

Effects of Room Ionic Liquid as Solute on the Electrolyte Solution Structure and Electrochemical Performances in Ethylene Carbonate-Based Electrolyte

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Optimizing solid electrolyte interphase on graphite anode by adjusting the electrolyte solution structure with ionic liquid

Cited by 7 publications

References 38 publications

Enhanced Electrochemical Performance of LiNi0.8Co0.1Mn0.1O2 Cathode with an Ionic Liquid-Based Electrolyte

Enhanced Electrochemical Performance of LiNi0.8Co0.1Mn0.1O2 Cathode with an Ionic Liquid-Based Electrolyte

Mechanistic understanding and strategies to design interfaces of solid electrolytes: insights gained from transmission electron microscopy

Effects of Room Ionic Liquid as Solute on the Electrolyte Solution Structure and Electrochemical Performances in Ethylene Carbonate-Based Electrolyte

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Enhanced Electrochemical Performance of LiNi_0.8Co_0.1Mn_0.1O₂ Cathode with an Ionic Liquid-Based Electrolyte

Enhanced Electrochemical Performance of LiNi_0.8Co_0.1Mn_0.1O₂ Cathode with an Ionic Liquid-Based Electrolyte