Insight into the Solid Electrolyte Interphase Formation in Bis(fluorosulfonyl)Imide Based Ionic Liquid Electrolytes

Jafta, Charl J.; Sun, Xiao‐Guang; Lyu, Hailong; Chen, Hao; Thapaliya, Bishnu P.; Heller, William T.; Cuneo, M.J.; Mayes, Richard T.; Paranthaman, Mariappan Parans; Dai, Sheng; Bridges, Craig A.

doi:10.1002/adfm.202008708

Cited by 34 publications

(44 citation statements)

References 66 publications

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“…The impedance spectra are shown in Figure 5a,b in which a semicircle from the high-tointermediate frequency region corresponds to SEI impedance, charge-transfer resistance, and the slope at low frequency represents the diffusion of lithium ion in the bulk electrode material. [6,45,46] Before cycling, both ECF-NMC811 and NMC811 exhibit similar impedance which was mainly dominated by the resistive oxide layer present at lithium surface. During the cycling, total impedance of NMC811 decrease slowly and reaches to minimum at 25th cycle (Figure 5a) which is similar to ECF-NMC811 at the 25th cycles.…”

Section: Resultsmentioning

confidence: 99%

Enhancing Cycling Stability and Capacity Retention of NMC811 Cathodes by Reengineering Interfaces via Electrochemical Fluorination

Thapaliya

Misra

Yang

et al. 2022

Adv Materials Inter

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ranging from 140 to 200 mAh g −1 , which is the capacity limiting electrode that determines the energy density of a cell. Therefore, it is essential to develop high-energy-density cathode materials with long cycling stability and high capacity retention for the longer driving ranges that promote vehicle electrification.To revolutionize electromobility, extensive research is being carried out on the high-capacity cathodes, amongst other cell components, with new approaches identified to optimize their performances. [4][5][6] LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NMC811 (80% Ni)) is one of the most promising cathode materials and has been touted as the next generation high capacity cathode for vehicle electrification because of its low Co content and simultaneous high practical energy density (specific capacity of ≈200 mAh g −1 and high discharge potential of ≈3.8 V vs Li/Li + ), [7][8][9] rate capability, and relatively lower cost. However, these high-energy cathodes with higher Ni content have suffered from structural instability, rapid capacity fading, and voltage evolution upon cycling. The instability of high voltage, high capacity cathodes originates from the reversible/irreversible phase transitions, particle cracking, oxygen evolution, transition metal cation dissolution, and detrimental side reactions with electrolytes at the electrode-electrolyte interphase leading to thick cathode-electrolyte interphase (CEI). [10][11][12][13][14][15] Similarly, the rapid capacity fading of NMC811, when cycled High-capacity cathodes (LiNi 0.8 Mn 0.1 Co 0.1 O 2 ) that can boost the energy density of lithium-ion batteries are promising candidates for vehicle electrification. However, several factors specific to high energy density materials entailing electrode reactions inhibit their application. Fluorination has shown a promising ability to combat the detrimental electrochemical performances of cathode materials, however, it remains difficult to achieve the desired functionality. Herein, a novel electrochemical fluorination (ECF) that demonstrates a promising electrochemical performance enhancement via stabilization of the cathode-electrolyte-interphase (CEI) by forming conformal LiF is proposed. Besides LiF surface layer formation, ECF reduces the degree of fluorinationinduced Ni/Li disordering and enhances the layered structural stability as probed by X-ray diffraction. Because of the robust CEI, ECF-NMC811 cathodes deliver 203.0 mAh g −1 first discharge capacity at the current rate of C/10, with ≈98% capacity retention up to 100 cycles. Similarly, it delivers ≈180 mAh g −1 capacity at a 1 C rate with 86.4% capacity retention up to 200 cycles with average coulombic efficiency of > 99.5%. Comprehensive characterization with a multitude of probes reveals that ECF enhances the cycling stability of the electrode without altering bulk structure and morphology.

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Section: Resultsmentioning

confidence: 99%

Enhancing Cycling Stability and Capacity Retention of NMC811 Cathodes by Reengineering Interfaces via Electrochemical Fluorination

Thapaliya

Misra

Yang

et al. 2022

Adv Materials Inter

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“… 36 also showed initial reduction at higher potentials in LiFSI electrolyte compared to in LiPF 6 electrolyte with FEC as additive, though with a larger difference in initial reduction voltage. Cyclic voltammograms have been recorded with an almost identical electrolyte (LiFSI in 1 : 2 EC : DMC with 5 wt% FEC, 1 wt% VC), 44 showing clearly the presence of reduction peaks at around 1.8, 1.1, 0.75 and 0.55 V. The peak at 1.8 V is related to the reduction of the LiFSI salts, 45 whereas the reduction peaks at lower potentials are related to reduction of the solvent components.…”

Section: Resultsmentioning

confidence: 99%

Improved electrochemical performance and solid electrolyte interphase properties of electrolytes based on lithium bis(fluorosulfonyl)imide for high content silicon anodes

et al. 2022

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“…In order to resolve this problem, numerous works has been done by introducing additives or blending with traditional electrolytes. [150][151][152] ILs blending with traditional electrolytes can not only ensure the high ionic conductivity and stable electrochemical window of ILs but also possess the merits of traditional electrolytes, such as low viscosity and excellent interface wettability. For example, Zn/polyaniline rechargeable batteries with the conventional alkaline electrolytes addition the ILs, 1-ethyl-3-methylimidazolium ethyl sulfate, used to prevent the formation of Zn dendrites.…”

Section: Ils Blend With Conventional Electrolytementioning

confidence: 99%

Recent Advances in Electrolytes for “Beyond Aqueous” Zinc‐Ion Batteries

et al. 2021

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Designing high performance electrolyte is an efficient strategy to circumvent these problems. As one of the most important components, electrolytes provide the basic operating environment to guarantee the transmission of the Zn 2+ between the two electrodes during the charge-discharge processes, affect the Zn 2+ /Zn plating/ stripping on the anode and deciding the electrochemically stable potential windows. [12] Since the utilization of alkaline electrolytes in batteries in earlier studies, Zn|KOH|MnO 2 batteries became a hot topic. [13] However, the using of an alkaline electrolyte always leads to the growth of Zn dendrites and the corrosion of the anode, resulting in rapid capacity fading. [14][15][16] Until 1986, the replacement of corrosive alkaline electrolyte systems by neutral aqueous electrolytes greatly improved the performance and safety of ZIBs. [17] Although the aqueous electrolytes alleviated the corrosion of the Zn electrode in some extent, the problems related to the growth of dendrites and the dissolution of the cathode, especially the limited electrochemical stability window (≈1.23 V) still are the challenge in the application of ZIBs. [18][19][20] The aqueous electrolytes of ZIBs often suffer from the water splitting process, including hydrogen evolution reaction and oxygen evolution reaction. [21][22][23] Therefore, in order to overcome the problems mentioned above, "beyond aqueous" electrolytes for ZIBs have attracted extensive attention in recent years. [24][25][26] At present, the "beyond aqueous" electrolytes for ZIBs have been reported mainly include liquid organic electrolytes and solid electrolytes. Zn anode in the organic electrolytes have high thermodynamic stability, avoiding the appearance of passivation products inevitably generated in traditional aqueous solution, i.e., ZnO and Zn(OH) 4 −2. [27] Solid-state electrolytes have sufficient mechanical strength to inhibit the growth of dendrites. [28] Moreover, the "beyond aqueous" electrolytes without water fundamentally avoid the decomposition of water and the formation of side products related to water. Compared with aqueous electrolytes, the "beyond aqueous" electrolytes exhibit a wide electrochemical stability window (Figure 1) and excellent thermodynamic stability of Zn anode leading to Zn plating/ stripping high reversibility with higher Coulombic efficiencies (CEs). [29] Although significant advances have been made in improving the electrochemical performance of the "beyond aqueous" electrolytes for ZIBs, several severe issues still exist, which largely prevent the development of "beyond aqueous" ZIBs. [30][31][32][33][34][35] The main issues of "beyond aqueous" electrolytes With the growing demands for large-scale energy storage, Zn-ion batteries (ZIBs) with distinct advantages, including resource abundance, low-cost, high-safety, and acceptable energy density, are considered as potential substitutes for Li-ion batteries. Although numerous efforts are devoted to design and develop high performance cathodes and aqueous electrolyt...

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Insight into the Solid Electrolyte Interphase Formation in Bis(fluorosulfonyl)Imide Based Ionic Liquid Electrolytes

Cited by 34 publications

References 66 publications

Enhancing Cycling Stability and Capacity Retention of NMC811 Cathodes by Reengineering Interfaces via Electrochemical Fluorination

Enhancing Cycling Stability and Capacity Retention of NMC811 Cathodes by Reengineering Interfaces via Electrochemical Fluorination

Improved electrochemical performance and solid electrolyte interphase properties of electrolytes based on lithium bis(fluorosulfonyl)imide for high content silicon anodes

Recent Advances in Electrolytes for “Beyond Aqueous” Zinc‐Ion Batteries

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